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introduction of micro-resistance slow-closing butterfly check valve

January 25, 2022

Introduction of Micro-resistance Slow-closing Butterfly Check Valve
The structure of the butterfly check valve is very simple, and its structural length is also very short compared to other check valves. Butterfly check valve is also called butterfly check valve. The connection method is wafer type. The

micro resistance butterfly check valve (3)

valve plate is two semicircular butterfly plates. The two butterfly plates are connected by the valve stem and are forced to reset by spring. The working principle of the butterfly check valve is: when the medium flows through the valve body channel, the medium pressure is greater than the force of the spring, and the two discs are pushed open, the valve is opened, and the medium flows; when the medium stops flowing, the two discs Then due to the force of the spring, the valve is forced to reset, and the valve is closed, and the backflow of the medium is prevented at the same time.
Butterfly check valve is also known as double-clip check valve. Its sealing surface can be surfacing wear-resistant material or lined with rubber. It has a wide range of use and reliable sealing. Butterfly check valves are automatic valves and do not require manual operation. This type of valve is usually used in pure pipelines, as well as pipelines in the fields of industry, environmental protection, water treatment, and high-rise building water supply and drainage, to prevent the backflow of the medium. To prevent the reverse flow of the medium.
The main code is HH46 HH48 HH49
Micro-resistance slow-closing butterfly check valve application
It is mainly used in the supply and drainage pipelines of purified water, source water, sewage, seawater and other media. It is installed at the outlet of the pump to cut off the backflow of the medium to eliminate destructive water hammer, protect the pipeline and make the pump run safely.
Features of Micro-resistance Slow-closing Butterfly Check Valve

micro resistance butterfly check valve (4)

1. Small in size, light in weight, and only about one-third of the length of the swing check valve, it is more suitable for use in pipelines with limited space.
2. The slow closing system has excellent performance, long-term movement does not fail, can effectively control the slow closing of the valve disc, and can eliminate the destructive water hammer.
3. Rubber soft seal, good sealing performance, wear resistance, long service life and better stability. .
4. There is a closing spring on the valve disc, which opens and closes smoothly, without vibration and noise.
5. The flow channel is usually small in fluid resistance, sensitive in opening and closing of the valve plate, and good in sealing performance.
6. Compared with other check valves, the flow resistance is smaller, and it has obvious energy saving effect.

Micro-resistance slow-closing butterfly check valve main parts and materials

Part Name	Material
valve body	Gray cast iron, carbon steel, ductile iron, stainless steel
Disc	Cast steel, ductile iron, stainless steel
stem, spring	Stainless steel
Slow closing device, micro-control valve	Stainless steel

Main technical parameters of micro-resistance slow-closing butterfly check valve

Nominal pressure (Mpa)	Shell test pressure (MPa)	Sealing test pressure (MPa)	proper temperature	Applicable media	Slow closing time
1	1.5	1.1	≤80℃	clean water, sewage, sea water	3-60 seconds
1.6	2.4	1.76
2.5	3.75	2.75

Product structure diagram of micro-resistance slow-closing butterfly check valve

structure diagram of micro resistance butterfly check valve

The main connection dimensions of some products of the micro-resistance slow-closing butterfly check valve (unit: mm)

main dimensions-sizes of micro resistance butterfly check valve

Working principle of micro-resistance slow-closing butterfly check valve

This check valve is mainly composed of a valve body, two semicircular discs, a return spring, an oil storage cylinder, a slow-closing small cylinder group, and a needle valve (micro-adjustment valve). Relying on the thrust of the imported medium, the two valve discs are pushed open smoothly. At the same time, the imported pressure medium enters the lower part of the piston in the oil cylinder, pushes the piston, and presses the oil on the upper part of the piston into the tail end of the small cylinder on both sides of the valve body through the needle valve, so that the piston rod in the small cylinder extends. When the inlet medium pressure drops below the outlet pressure, the medium will flow back, and the valve flap will automatically close under the action of the spring and the medium backflow. However, since the piston rod is in the extended position, it cannot be fully closed against the valve disc, and there is still about 20% of the area left for the medium to pass through, thus eliminating the water hammer. The valve disc is divided into two steps by the piston to quickly close first and then slowly to close, which can not only prevent the motor from reversing, but also play the role of eliminating mute.

Installation of Micro-resistance Slow-closing Butterfly Check Valve

1. The check valve can be installed horizontally (the arrow is parallel to the horizontal ground), or it can be installed vertically (the arrow is vertical to the horizontal ground).
2. Before installation, the pipeline should be cleaned, and the valve should be fully inspected to ensure that it is not damaged and then loaded into the pipeline. When loading, pay attention to the direction of the arrow and the running direction of the medium.
3. A filter should be installed at the inlet of the valve. A butterfly valve or gate valve should be installed at the outlet to facilitate the maintenance of the valve and other equipment.
4. When tightening the flange connecting bolts, attention should be paid to the symmetry, uniformity and firmness.
5. For a check valve with a working pressure greater than 1.0 MPa, the strength and tightness test should be carried out before installation, and it can be used only after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the duration of the test meets the requirements of GB 50243.
6. The check valve cannot bear the weight in the pipeline, and the large check valve should be supported independently so that it will not be affected by the pressure generated by the pipeline system.

Operation and debugging of micro-resistance slow-closing butterfly check valve

1. Initial test debugging
Close the needle valve on the oil reservoir clockwise, then open it counterclockwise for 3-5 turns.

2. Operation adjustment
After starting the water pump, observe whether there is oil leakage or water leakage at each connection of the slow-closing system. At the same time, use a wrench to loosen the screw plug on the needle valve body by one or two turns, so that the air in the slow-closing system can be discharged, and then quickly tighten the screw plug until there is leakage. When the pipeline pressure rises to a certain pressure, stop the pump and observe, there may be two situations at this time:

(1) The seal does not die when closed, and the motor reaches the speed of rotation faster. The reason for this phenomenon is that the opening of the needle valve is too small, and the pressure oil in the small cylinder does not return to the oil storage cylinder in a short time, so that the valve disc cannot be closed for a long time. At this point, just turn the needle valve counterclockwise half a turn to one turn.

(2) The seal is closed quickly, and the pipeline produces a great vibration sound. There are two reasons for this phenomenon: A) Because the opening of the needle valve is too large, the oil in the small cylinder quickly returns to the oil storage cylinder, that is, the valve disc is quickly closed to produce water hammer. At this time, try to close the small needle valve clockwise. If the small needle valve is closed and the pump is turned on for the second time, there is still a loud vibration when the pump is stopped again, which belongs to the reason B. B) The piston in the small cylinder does not extend. Check whether the needle valve is open, gently loosen the oil pipe joint at the small cylinder, and observe whether there is oil coming out. If there is oil leakage, it is proved that the oil circuit is unblocked. At this time, it may be because the oil in the oil storage is not enough, please refuel urgently. Refueling method: Disassemble the oil pipe joints on both sides of the needle valve, remove the needle valve counterclockwise with a wrench, insert a steel rod with a diameter of about 12mm and a length of about 300mm into the oil cylinder, and use a hammer to gently press the oil cylinder into the oil cylinder. The piston is knocked into the bottom end, at this time, add 20# oil to the oil cylinder, then install the needle valve, and then connect the copper pipe.
After the operation is adjusted, there is no need to move all parts, and it will work automatically and normally in the future.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of center-lined butterfly valve: https://youtu.be/NuSZH_AJcwY
Video of double eccentric butterfly valve: https://youtu.be/yOw2xp3bIaE
Video of triple eccentric butterfly valve: https://youtu.be/AkRwg2X1Wh0
Video of dual plate wafer check valve: https://youtu.be/XqRRI7o-LFI
Video of knife gate valve: https://youtu.be/vFSbTF_FGXM
Video of PTFE butterfly valve: https://youtu.be/Lutith_TJD0
Video of resilient seated gate valve: https://youtu.be/AI-LT1dy2sU

Introduction to the applicable occasions of butterfly valve

September 24, 2021

Butterfly valve is one of the most commonly used valves in piping systems. It has a wide range of applications. It can not only be used to cut off the flowing medium in the pipeline, but also can be used for flow adjustment. When the

Fluorine lined butterfly valve-PTFE-WAFER (10)

fluid in the pipeline passes through the butterfly valve, the pressure loss is about 3 times that of the gate valve, and the pressure loss is relatively large. Therefore, two factors should be considered when choosing a butterfly valve. One is the pressure loss experienced by the piping system, and the other is the pressure of the pipeline medium and the working temperature that the elastic valve seat material can withstand when the butterfly valve is closed.
The structural length of the butterfly valve is short, the overall height is also small, the operating torque is short, it can be opened and closed quickly, and fluid control can be performed well. The structural principle of the butterfly valve makes it most suitable for making large-diameter valves. When the butterfly valve is required to be used for flow control, in order to make it work more effectively, it is necessary to select the correct size and type of the butterfly valve.

What occasions are butterfly valves suitable for?

Double eccentric-wafer butterfly valve-D372F-150lbP-stainless steel (1)

1. It is required to be used for throttling and regulating control in the pipeline, and the valve structure is required to be short in length and fast in opening and closing. It is recommended to use a butterfly valve.
2. On pipelines that require two-position adjustment and necking, low noise is required, cavitation is generated, a small amount of leakage into the atmosphere, and the circulating medium is corrosive, a butterfly valve can be selected.
3. Under special working conditions where there are strict requirements for sealing, low temperature containing impurities, and easy to cause wear, it is recommended to use butterfly valves, and to use metal-sealed triple-eccentric or double-eccentric butterfly valves.
4. In petroleum, petrochemical, chemical, metallurgical, electric power and other fields, it is recommended to use metal hard-seal triple-eccentric butterfly valves. In many cases, they can replace gate valves and globe valves.
5. The center line butterfly valve is suitable for the environment with strict requirements on sealing performance and zero leakage. The center line butterfly valve is most suitable for fresh water, sewage, sea water, salt water, steam, natural gas, oil and oil at a working temperature of -10-150℃. Used in pipelines of various acid and alkali media.

triple offset butterfly valve-double flange- (5)

6. The double eccentric butterfly valve is very suitable for use in urban heating, gas, water and gas pipelines, as a device for intercepting or adjusting flow.
7. Eccentric soft sealing butterfly valves are widely used in gas pipelines and waterways in metallurgy, light industry, electric power and petrochemical systems. Used as a two-way opening, closing and adjustment of the ventilation and dust removal pipeline.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Introduction to the applicable occasions of butterfly valve

September 23, 2021

Butterfly valve is one of the most commonly used valves in piping systems. It has a wide range of applications. It can not only be used to cut off the flowing medium in the pipeline, but also can be used for flow adjustment. When the fluid in the pipeline passes through the butterfly valve, the pressure loss is about 3 times that of the gate valve, and the pressure loss is relatively large. Therefore, two factors should be considered when choosing a butterfly valve. One is the pressure loss experienced by the piping system, and the other is the pressure of the pipeline medium and the working temperature that the elastic valve seat material can withstand when the butterfly valve is closed.

U-type flange butterfly valve, ductile iron, DI, center line,

The structural length of the butterfly valve is short, the overall height is also small, the operating torque is short, it can be opened and closed quickly, and fluid control can be performed well. The structural principle of the butterfly valve makes it most suitable for making large-diameter valves. When the butterfly valve is required to be used for flow control, in order to make it work more effectively, it is necessary to select the correct size and type of the butterfly valve.

What occasions are butterfly valves suitable for?
1. It is required to be used for throttling and regulating control in the pipeline, and the valve structure is required to be short in length and fast in opening and closing. It is recommended to use a butterfly valve.
2. On pipelines that require two-position adjustment and necking, low noise is required, cavitation is generated, a small amount of leakage into the atmosphere, and the circulating medium is corrosive, a butterfly valve can be selected.
3. Under special working conditions where there are strict requirements for sealing, low temperature containing impurities, and easy to cause wear, it is recommended to use butterfly valves, and to use metal-sealed triple-eccentric or double-eccentric butterfly valves.
4. In the fields of petroleum, petrochemical, chemical, metallurgy, electric power, etc., it is recommended to use metal hard seal triple eccentric butterfly valve. In many cases, it can replace gate valve and stop valve.
5. The center line butterfly valve is suitable for the environment with strict requirements on sealing performance and zero leakage. The center line butterfly valve is most suitable for fresh water, sewage, sea water, salt water, steam, natural gas, oil and oil at a working temperature of -10-150℃. Used in pipelines of various acid and alkali media.
6. The double eccentric butterfly valve is very suitable for use in urban heating, gas, water and gas pipelines, as a device for intercepting or adjusting flow.
7. Eccentric soft sealing butterfly valves are widely used in gas pipelines and waterways in metallurgy, light industry, electric power and petrochemical systems. Used as a two-way opening, closing and adjustment of the ventilation and dust removal pipeline.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

What is butt welding? (4)- flash butt welding

September 29, 2020

2. Resistance and heating of flash butt welding

The contact resistance Rc during flash butt welding is the total resistance of the liquid metal lintel between the end faces of the two workpieces, and its size depends on the number of lintels and their cross-sectional area at the same time. The latter two are related to the cross-sectional area of the workpiece, the current density and the

flash butt welding-schematic diagram

approach speed of the two workpieces. With the increase of these three, the number of lintels and their cross-sectional area simultaneously existing increases, and Rc will decrease.

The Rc of flash butt welding is much larger than that of resistance butt welding, and it exists throughout the flashing stage. Although its resistance value gradually decreases, it is always greater than the internal resistance of the workpiece. Rc does not disappear completely until the upsetting starts. Figure 14-5 shows the general law of Rc, 2Rω and R changes during flash butt welding. The gradual decrease in Rc is due to the increase in the approach speed of the workpiece as the end surface temperature increases during the flashing process, and the number and size of the lintels increase accordingly.

Because Rc is large and there is the entire flashing stage, the heating of the joint during flash butt welding mainly depends on Rc.

Three, flash butt welding welding cycle, process parameters and workpiece preparation

1, welding cycle

The welding cycle of flash butt welding is shown in 14-7, and the reset time in the figure refers to the time from loosening the workpiece to returning to the original position. There are two preheating methods: resistance preheating and flashing preheating. The figure (b) uses resistance preheating.

2, process parameters

The main parameters of flash butt welding are: extension length, flash current, flash flow, flash speed, upsetting flow, upsetting speed, upsetting pressure, upsetting current, clamping force, etc. Figure 14-8 is a schematic diagram of each flow rate and extension length of continuous flash butt welding. The following describes the influence of various process parameters on welding quality and the principles of selection:

(1) Elongation length l0 is the same as resistance butt welding, l0 affects the temperature distribution along the axial direction of the workpiece and the plastic deformation of the joint. In addition, with the increase of l0, the impedance of the welding circuit increases, and the required power also increases. Under normal circumstances, bar and thick arm tube l0=(0.7-1.0)d, d is the diameter of the round bar or the side length of the square bar.

For thin plates (δ=1-4mm), in order not to lose stability during upsetting, generally l0=(4-5)δ.

When different metals are butt welded, in order to make the temperature distribution on the two workpieces consistent, usually the metal with poor electrical and thermal conductivity should be smaller. Table 1 is the l0 reference value for flash butt welding of different metals.

(2) The flash current If and the upsetting current Iu If depend on the cross-sectional area of the workpiece and the current density jf required for the flash. The size of jf is related to the physical properties of the welded metal, flashing speed, the area and shape of the workpiece section, and the heating state of the end surface. In the flashing process, as vf gradually increases and contact resistance Rc gradually decreases, jf will increase. During the upsetting, Rc disappears quickly, and the current will increase sharply to the upsetting current Iu. When welding large-section steel parts, in order to increase the heating depth of the workpiece, a smaller flash speed should be used, and the average jf used generally does not exceed 5A/mm2. Table 2 shows the reference values of jf and ju for flash butt welding of workpieces with a cross-sectional area of 200-1000mm2.

The magnitude of the current depends on the no-load voltage U20 of the welding transformer. Therefore, in actual production, the secondary no-load voltage is generally given. When selecting U20, in addition to considering the impedance of the welder circuit, when the impedance is large, U20 should be increased accordingly. When welding large-section workpieces, the method of adjusting the secondary voltage in stages is sometimes used. At the beginning, a higher U20 is used to excite the flash, and then it is reduced to an adaptive value.

(3) Flash flow rate δf The flash flow rate should be selected so that there is a molten metal layer on the end of the workpiece at the end of the flash, and the plastic deformation temperature is reached at a certain depth. If δf is too small, the above requirements cannot be met, which will affect the welding quality. If δf is too large, it will waste metal materials and reduce productivity. When choosing δf, you should also consider whether there is preheating, because the δf of preheating flash butt welding can be 30-50% smaller than continuous flash butt welding.

Description of electric valve connection

September 11, 2020

Electric valve wiring methods are classified according to different use requirements and different field conditions,

lug type butterfly valve, ductile iron, center lined,

and the wiring methods used by electric actuators with different functions are also different. The user should have an understanding of the relevant knowledge of the wiring, so as to avoid unnecessary failures. On the one hand, the entire circuit will be short-circuited; On the other hand, it may cause huge economic losses caused by the burning of the machine, or even more serious Accident!

Electric valve actuators can generally be divided into AC (AC110V, AC220V, AC380V) and DC (DC24V, DC12V) according to the power supply voltage. According to the control method, they can be divided into active switch type, passive switch type, potentiometer type, explosion-proof type, and adjustable type Wait. (Related products: Electric switching butterfly valve, Electric regulating butterfly valve, Electric switching ball valve, Electric regulating ball valve)

Active switch type, common switch type with source indicator wiring diagram

Passive switch type, switch type passive contact type with feedback wiring diagram

Opening type potentiometer type, switch type with opening type wiring diagram

Intelligent adjustment type, input and output 4-20mA, intelligent adjustment type wiring diagram

AC 380V, with passive contact feedback, 380V power supply wiring diagram

DC24V, exchange of positive and negative switches and passive signal feedback, 24V power supply wiring diagram

Note: The above circuit diagram is for reference only, the actual circuit diagram attached to the product shall prevail. In addition, the electric devices of each manufacturer are different, and the wiring methods are also different. Please do not perform operations based on this standard. If a series of problems or related accidents occur, our company will not be responsible. !

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Valve material and valve standards-(7)- Monel alloy

September 7, 2020

Monel alloy for corrosion resistant valve
1. Introduction/overview of Monel alloy:
Monel alloy, cast nickel alloy, Hastelloy alloy, etc. are all materials for making special purpose valves. Monel alloy is a Ni-Cu alloy in nickel-based corrosion-resistant alloys. It was first developed by the US Nickel Company. Its typical composition is 70% Ni and 30% Cu. It is the most widely used nickel-based corrosion-resistant alloy.

Monel alloy not only has high strength and toughness, but also has excellent resistance to corrosion by reducing acid and strong alkali media and sea water, so it is usually used to manufacture and transport hydrofluoric acid (HF), salt water, neutral media, and alkali salts. And reducing acid medium equipment. Monel alloy is also suitable for dry chlorine, hydrogen chloride, high temperature chlorine (425°C) and high temperature hydrogen chloride and other media, but it is not resistant to corrosion by sulfur-containing media and oxidizing media (such as nitric acid, media with high oxygen content), and it is nickel It reacts violently with sulfur and oxygen and easily forms Ni3S2 and NiO.

2. Performance of Monel alloy:
Monel alloy is a Ni-Cu solid solution, where Cu is used as a non-oxidizing resist added to Ni, which improves the corrosion resistance of nickel alloys and acts as a strengthening alloy. The addition of C can improve the casting performance of the alloy, but only 0.15% of C can be dissolved in the alloy at room temperature, and the excess C will be precipitated as a graphite phase. Adding 1.5%-3.5% Fe can also improve the casting performance of the alloy. Adding Mn and Si can improve the mechanical properties of the alloy, especially the content of Si has an important influence on the mechanical and physical properties of the Monel alloy.

3. Classification of Monel alloy:
Monel alloys are classified into casting alloys and deformed alloys.
3.1 Deformation alloy: There are more than 10 types of deformed Monel alloys in the United States, such as Monel400, MonelC, Monel403, Monel404, Monel R2405, Monel406, Monel411, MonelK500, MonelK501 and Monel502. Because Monel has its own representation methods in different American standard systems, SAE and ASTM jointly developed ASTM2SAE unified digital system (unified numbt system2 UNS) in order to facilitate the use and unified management of calculations. In the United States’ UNS, nickel alloys have 5 grades of deformed Monel alloys, including solid solution hardened No5500 (Monel400), No4404 (Monel404) and No4405 (MonelR2405), and precipitation hardened NO5500 (MonelK500) and NO5502 (Monel502). ) Etc. (refer to Table 1). Among them, the deformed Monel alloy commonly used in the manufacture of corrosion-resistant valves is Monel400 and MonelK500.
Table 1. Chemical composition of deformed Monel alloy in United States UNS

Grade name	chemical composition/ %
Grade name	C	Si	Mn	S	Ni	Fe	others
NO4400(Monel400)	≤0.3	≤0.5	2	≤0.024	63-70	≤2.5	Cu base
No4404(Monel404)	≤0.15	≤0.1	≤0.1	≤0.024	52-57	≤0.5	Cu base, Al≤0.05
No4405(MonelR2405)	≤0.3	≤0.5	≤2.0	0.025-0.06	63-70	≤2.5	Cu base
No5500(MonelK500)	≤0.25	≤0.5	≤1.5	≤0.01	63-70	≤2	Cu base, Al213-3115,Ti0135-0185
NO5502(Monel502)	≤0.10	≤0.5	≤1.5	≤0.01	63-70	≤2	Cu base, Al215-315

3.2 Casting alloy: The American cast Monel alloy has five grades of M35-1, M35-2, M-30H, M-25S and M-30C in ASTM A494 (Table 2), which is in the US Federal Standard QQ-N2-88 There are also 5 cast Monel alloys (Table 3).
Table 2. Cast Monel alloy in ASTM A494:

grade name

chemical composition /%

mechanical properties

C

Mn

Si

P.S

Cu

Fe

Ni

Nb

Compressive strength/Mpa

Tensile strength/Mpa

Elongation rate/%

HB

M35-1(a)

≤0.35

≤1.5

≤1.25

≤0.03

26-33

≤3.5

Ba

≥450

≥170

≥25

M35-2

≤0.35

≤1.5

≤2.00

≤0.03

26-33

≤3.5

Ba

≥450

≥205

≥25

M-30H

≤0.30

≤1.5

2.7-3.7

≤0.03

27-33

≤3.5

Ba

≥690

≥415

≥10

M-25S

≤0.25

≤1.5

3.5-4.5

≤0.03

27-33

≤3.5

Ba

243-294(b)

M-30C(a)

≤0.30

≤1.5

1.0-2.0

≤0.03

26-33

≤3.5

Ba

1-3

≥450

≥225

≥25

125-130(b)

Notes:
1.Ba=balance, means the balance is all Ni content.
2. To remove the weldability, it should be M3521 or M230C
3. This table is a data parameter
4. HB minimum is 300
Table 3 QQ2N2288 cast Monel alloy:

QQ-N-288	chemical composition /%							mechanical properties
QQ-N-288	C	Si	Mn	Cu	Fe	Ni	Nb	Compressive strength/Mpa	Tensile strength/Mpa	Elongation rate/%	HB
A	≤0.35	≤2.0	≤1.5	26-33	≤2.5	62-68		≥448	≥224	≥25	125-150
B	≤0.30	2.7-3.7	≤1.5	27-33	≤2.5	61-68		≥689	≥455	≥10	240-290
C	≤0.20	3.3-4.5	≤1.5	27-31	≤2.5	≥60		≥825	≥550	≥10	250-300
D	≤0.25	3.5-4.5	≤1.5	27-31	≤2.5	≥60					≥300
E	≤0.30	1.0-2.0	≤1.5	26-33	≤2.5	≥60	1-3	≥448	≥221	≥25	125-150

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D.

Strainer valve introduction and its features

August 17, 2020

STRAINER VALVE, also known as filter: a device for filtering pretreatment. The filter valve is the filter equipment necessary for the use of hydraulic control valves and precise and easy-to-clog mechanical products.

Strainer valve Introduction:
STRAINER VALVE, also known as filter: a device for filtering pretreatment. The filter valve is the filter equipment necessary for the use of hydraulic control valves and precise and easy-to-clog

15 Y-type-strainer-filter-valve-7

Y type strainer filter valve (11)

mechanical products. It is an indispensable device in the pipeline series that transports the medium. It is usually installed at the inlet of hydraulic control valves, pressure relief valves, pressure relief valves, fixed water level valves and other equipment to eliminate impurities in the medium and prevent particulate impurities from entering The channel causes wall plugs to protect the fittings on the equipment pipeline from wear and blockage. When cleaning is needed, just take out the detachable filter cartridge and reinstall it after treatment. Therefore, the use and maintenance are extremely convenient.

Features of filter valve:
The filter valve mesh adopts a stainless steel double-layer mesh structure, which is sturdy and durable. It has the characteristics of advanced structure, low flow resistance, and convenient sewage discharge. It can be used for water, steam, oil, nitric acid, urea, oxidizing media and other media. The mesh number of the filter screen should be set according to the user’s needs. Generally, the water network is 18-30 mesh, the ventilation network is 40-100 mesh, and the oil network is 100-480 mesh. The Y-type filter can also be combined with the telescopic joint to form a Y-type pull rod telescopic filter with adjustable installation length. The filter screen can be made according to user requirements.

Filter valve performance parameters:
Connection method: flange, butt welding, thread
Nominal pressure/MPa: 1.0-2.5
Pressure test pressure/MPa: 1.1-2.75
Working pressure/MPa 1.0 -2.5
Shell material: gray cast iron. ductile iron. carbon steel. stainless steel
Filter material: stainless steel
Total mesh area: 3～4DN

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Knife gate valve introduction and its characteristics

August 14, 2020

Knife gate valve entered China in the 1980s. In less than two decades, its use has expanded from ordinary fields to a

Knife gate valve (1)

wider range of industries, from coal preparation, gangue discharge, and slag discharge in mines and power plants to Urban sewage treatment has evolved from general industrial pipelines to specialized pipeline systems for food, sanitation, and medicine.

What is a knife gate valve:
Knife gate valve-also known as knife door valve, knife-type slurry valve, entered my country in the 1980s. In less than two decades, its scope of use has expanded from the general field to a wider range of industries. Coal preparation, gangue discharge and slag discharge from mines and power plants. It has developed into urban sewage treatment, from general industrial pipelines to professional pipeline systems such as food, sanitation, and medicine. The ultra-thin knife gate valve completely solves the large flow resistance of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves and other valves with its advantages of small size, small flow resistance, light weight, easy installation, and easy disassembly. , Heavy weight, difficult installation, large area and other difficult problems. After the emergence of knife gate valves, a large number of general shut-off valves and regulating valves have been replaced. To date, the world’s largest consumption of knife gate valves is the United States and Japan.

Characteristics of knife gate valve:

Knife gate valve-

1. Valve control can be used for local and remote control, and can also realize remote position display and remote centralized control according to user requirements.

2. Light weight: The body is made of carbon steel, and the weight is about 20%-30% lighter than the traditional gate valve. It is easy to install and maintain.

3. The use of this valve can improve the closing and sealing performance of the conveying pipeline system, prevent leakage to the maximum extent, and play a positive role in improving production efficiency and protecting the environment.

4. The sealing surface is made of highly wear-resistant and corrosion-resistant ceramic materials, and the use of inlay technology has high corrosion resistance and good wear resistance, so that the valve has a long life and the cost performance is 10 times higher than that of ordinary valves.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Introduction of Carbon steel lift check valve H41H-16C

August 10, 2020

H41H-16C carbon steel lift check valve (check valve) is also known as one-way valve or check valve. Its opening and

lift-swing-check-valve-2

closing parts are opened or closed by the flow and force of the medium, and its function is to prevent the medium in the pipeline from flowing back .
check valve can be divided into three types according to the structure: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and horizontal; swing check valves are divided into three types: single, double and multiple; butterfly check valves are straight-through. The above-mentioned check valves can be divided into threaded connection, flange connection, wafer type and welding in connection form.
Attention to the installation of H41H-16C carbon steel lift check valve:
1. Do not allow the check valve to bear weight in the pipeline, and the large check valve should be independently supported so that it is not affected by the pressure generated by the pipeline system.
2. When installing, pay attention to the direction of medium flow should be consistent with the direction of the arrow marked on the valve body.
3. Lifting vertical flap check valve should be installed on the vertical pipeline.
4. Lifting horizontal flap check valve should be installed on the horizontal pipeline.

The products of Tianjin Tanghai Valve Manufacturing Co., Ltd. are:
1. Lift check valve: materials include cast iron, cast steel, stainless steel, chromium molybdenum steel; pressure: 1.0-16Mpa; connection methods include threaded connection, flange connection, welding; nominal pass: DN25-1200
Such as: cast steel lift check valve H41H-16C; stainless steel lift check valve H41W-16P; water pump bottom valve H42W-10/H42H-16C/H42W-16P.
Silence check valve HC41T-10; Silent check valve H42T-10; Spherical check valve HQ41X-10; Vertical fluorine-lined check valve H42F-10; Fluorine-lined lift check valve H41F46-16C; Wafer Muffler check valve H71T-10; Welded check valve H61H/Y-160
2. Swing check valve: the materials are cast iron, cast steel, stainless steel, chromium molybdenum steel; pressure: 1.0-16Mpa; connection methods include threaded connection, flange connection, welding; nominal passage: DN25-1200
Such as: cast steel swing check valve H44H-16C; stainless steel swing check valve H44W-16P; cast iron swing check valve H44T-10; rubber flap swing check valve HC44X-10; threaded connection Swing check valve H14H-16C/H14W-16P/H14T-10, H74W/F-16P.
3. Butterfly check valve: the materials are cast iron, cast steel, stainless steel, chromium molybdenum steel; pressure: 1.0-16Mpa; connection methods include threaded connection, flange connection, welding; nominal diameter: DN25-1200
Such as: double disc butterfly check valve H76H-16C/H76W-16P; micro resistance slow closing check valve HH47H-16C/HH48H-16C/HH49H-16C

To ensure your requirements, please specify when ordering:
1. For new project users, please provide the model designed by the design institute, and for replacement parts users, please provide the product model used before
2. If there is no specific model, please provide: 1. Use medium and temperature; 2. Working pressure; 3. Transmission method; 4. Connection method; 5. Structure form;
6. Nominal diameter, etc.
To
H41H-16C carbon steel lift check valve model, performance parameters, structure size parameters, price and other details. (Note: All text, data, and pictures in this article are for reference only. If you need detailed parameters, please call Senpin Company. With professional technology, professional manufacturing, and professional services, Tanghai Valve is committed to meeting user expectations , Constantly improve service quality, keep improving, “Sincere Service” is the eternal theme of Senpin. If you need help, please contact our sales Harry Li.)

TH VALVE is one of the largest butterfly valve manufacturers in China, main products are butterfly valves, check valves. Our products use advanced manufacturing technology, and strictly conform to API, DIN, BS, EN, ISO, GB and other international standards. The main products are butterfly valves, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…), etc. Our products are widely used in various fields such as marine industry, shipbuilding, petrochemical, metallurgy, water treatment, fire fighting, water supply and drainage, etc. The company has won unanimous recognition and praise from customers with high quality and good reputation.

Introduction of cast steel lift swing check valve

August 5, 2020

1. Overview of Cast steel lift check valve:

The lift check valve is selected for the pipelines of various working conditions such as petroleum, chemical industry

lift swing check valve (2)

and thermal power plants with a nominal pressure of PN1.6～6.4MPa and a working temperature of -29～550℃. Applicable media are: water, oil, steam, etc.

2. Structural features of Cast steel lift check valve:

1. Exquisite selection of materials, in line with domestic and foreign standards, the highest quality of materials.

2. The sealing pair is advanced and reasonable. The sealing surface of the valve disc and the valve seat is made of iron-based alloy or Stellite cobalt-based cemented carbide. It has good wear resistance, high temperature resistance, corrosion resistance and scratch resistance. ,long lasting.

3. The products are designed and manufactured according to the national standard GB/T12235.

4. Various piping flange standards and flange sealing types can be used to meet various engineering needs and user requirements.

5. The valve body has a complete range of materials, and the gasket can be reasonably selected according to actual working conditions or user requirements, and can be suitable for various pressure, temperature and medium working conditions.

According to user requirements, check valves with different structures and connections can be designed and manufactured for use with various equipment.

H41H lift check valve: Do not allow the check valve to bear weight in the pipeline. Large-scale check valves should be independently supported to prevent them from being affected by the pressure produced by the pipeline system. When installing, pay attention to the direction of medium flow should be consistent with the arrow direction indicated by the valve body. Suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

H41H, H41Y type PN16~PN100 lifting steel check valve is one of the important links in the production process regulation system. It is a valve that controls the one-way flow of the medium in the pipeline to prevent the medium from flowing back. It is widely used in purification equipment, petroleum, chemical industry, metallurgy, electric power, textile and other production processes.

Product features of lift check valve:

1. H41H and H41Y lift-type steel check valves have the advantages of simple structure, reliable action and convenient maintenance.

2. When the medium flows into the valve body from the direction indicated by the arrow of the valve body, the pressure of the medium acts on the valve flap to produce an upward thrust. When the medium thrust is greater than the weight of the valve flap, the valve opens. When the force of the medium pressure acting on the disc after the valve plus the weight of the disc itself is greater than the force of the pressure acting on the disc before the valve, the valve is closed to prevent the medium from flowing back.

Lift check valve refers to the valve that automatically opens and closes the valve flap depending on the flow of the medium itself to prevent the medium from flowing back, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. Check valve is a kind of automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. Check valves can also be used to supply pipelines for auxiliary systems whose pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

Check valves are also called check valves, check valves, reverse flow valves, and back pressure valves.

The function of the check valve is to only allow the medium to flow in one direction and prevent the reverse flow. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. Among them, the internal thread check valve and the butterfly check valve belong to this type of valve.

It includes swing check valve and lift check valve. The swing check valve has a hinge mechanism and a valve flap like a door that rests freely on the inclined valve seat surface. In order to ensure that the valve clack can reach the proper position of the valve seat surface every time, the valve clack is designed in a hinge mechanism so that the valve clack has enough space for rotation and makes the valve clack really contact the valve seat. The valve disc can be made of metal, or inlaid with leather, rubber, or synthetic covering, depending on the performance requirements. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is seated on the sealing surface of the valve seat on the valve body. Except that the disc can be lifted and lowered freely, the rest of this valve is like a shut-off valve. The fluid pressure lifts the disc from the sealing surface of the valve seat, and the backflow of the medium causes the disc to fall back onto the seat and cut off the flow. According to the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of a rubber pad or a rubber ring inlaid on the disc holder. Like a shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is restricted Rarely.

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