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Valve material and valve standards-(4)-fastener material

September 3, 2020

Fastener materials: Fasteners mainly include bolts, studs and nuts. The fastener directly bears the pressure on the

bolts and nuts for butterfly valve

valve, which plays a key role in preventing the outflow of the medium. Therefore, the selected material must ensure sufficient strength and impact toughness at the operating temperature.

When selecting fastener materials according to medium pressure and temperature, the following table can be selected:

Name	Pn(Mpa)	medium temp /°C
		300	350	400	425	450	530
bolt Stud bolt	1.6-2.5	Q235(A3)		35		30CrMoA	–
	4.0-10.0	35				35CrMoA	25Cr2MoVA
	16.0-20.0	30CrMoA		35CrMoA			25Cr2MoVA
nut	1.6-2.5	Q235(A3)		30		35
	4.0-10.0	30				35	35CrMoA
	16.0-20.0	35					35CrMoA

Heat treatment must be carried out when selecting alloy steel materials. When there are special corrosion resistance requirements for fasteners, stainless acid-resistant steels such as Cr17Ni2, 2Cr13, 1Cr18Ni9 can be selected.

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-(3)-sealing material

August 28, 2020

Section 2: Sealing surface material
The sealing surface is the most critical working surface of the valve. The quality of the sealing surface is related to the service life of the valve. Generally, the sealing surface material considers factors such as corrosion resistance, scratch resistance, erosion resistance, and oxidation resistance. Generally, sealing surface materials are divided into two categories:
1. Soft materials

soft sealing marine valve, rubber sealing, valve seat parts

1. Rubber (including nitrile rubber, ethylene propylene rubber, fluorine rubber, etc.)
2. Plastics (polytetrafluoroethylene, nylon, etc.)
2. Hard sealing material
1. Copper alloy (for low pressure valve)
2. Chrome stainless steel (used for ordinary high and medium pressure valves)
3. Stellite alloy (used for high temperature and high pressure valves and strong corrosion valves)
4. Nickel-based alloy (used for corrosive media)

Section 3: Valve Stem Material
During the opening and closing of the valve, the valve stem bears tensile, compressive and torsional forces, and is in direct contact with the medium. At the same time, there is relative frictional movement with the packing. Therefore, the valve stem material must ensure sufficient strength at the specified temperature And impact toughness, a certain degree of corrosion resistance and abrasion resistance, and good manufacturability. Commonly used valve stem materials are as follows:
1. Carbon steel: For water with low temperature and medium temperature not exceeding 300°C, when steam

18 buttefly-valve-stem-shaft-parts-1

medium, A5 ordinary carbon steel is generally selected (now Q275, A3 is Q235)
2. Alloy steel: For medium pressure and high pressure, when the medium temperature does not exceed 450°C, 40Cr (chromium steel) is generally used when the medium temperature does not exceed 450°C. Water, the medium temperature does not exceed 540°C For steam and other media, 38CrMoAlA nitriding steel can be selected; for high-pressure steam media with a medium temperature not exceeding 570°C, 25Cr2MoVA chromium molybdenum vanadium steel is generally selected.
3. Stainless and acid-resistant steel: used for medium and high pressure, non-corrosive and weakly corrosive media with a medium temperature not exceeding 450°C. 1Cr13, 2Cr13, 3Cr13 chromium stainless steel can be selected; when used in corrosive media, it can be used Use Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, Cr18Ni12Mo3Ti and other stainless acid-resistant steels and PH15-7Mo precipitation hardening steels.
4. Heat-resistant steel: 4Cr10Si2Mo martensitic heat-resistant steel and 4Cr14Ni14W2Mo austenitic heat-resistant steel can be used for high-temperature valves whose medium temperature does not exceed 600°C.

Section 4: Valve Stem Nut Material
The stem nut directly bears the axial force of the stem during the opening and closing of the valve, so it must have a certain strength. At the same time, it and the valve stem are threaded transmission, which requires a small coefficient of friction, no rust and avoid seizure. The main materials are as follows:
1. Copper alloy: Copper alloy has a small friction coefficient and does not rust. It is one of the commonly used materials. For low pressure valves with Pg<1.6Mpa, ZHMn58-2-2 cast brass can be used.
2. Steel: When the working conditions do not allow the use of copper alloys, high-quality carbon steels such as 35, 40, 2Cr13, 1Cr18Ni9, Cr17Ni2 and other stainless and acid-resistant steels can be selected. The working conditions do not allow the following:
For electric valves, stem nuts with gua-shaped clutches require heat treatment to obtain high hardness or surface hardness.
When the working medium or the surrounding environment is not suitable for copper alloys, such as ammonia medium that is corrosive to copper.
When selecting steel stem nuts, pay special attention to thread seizure.

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-(2)-body stem bonnet material

August 27, 2020

Selection of valve material:
There are many materials for manufacturing valve parts, including various types of ferrous and non-ferrous metals and their alloys, and various non-metallic materials. The materials for manufacturing valve parts are selected

16 U-type-flange-butterfly-vlave-body

according to the following factors:
1. The pressure, temperature and characteristics of the working medium.
2. The force of the part and its function in the valve structure.
3. Have better manufacturability.
4. If the above conditions are met, there must be a lower cost.

Section one: the material of the valve body, bonnet and valve plate
1. Gray cast iron: Gray cast iron is suitable for water, steam, air, gas, oil and other media with a nominal pressure of PN≤1.0MPa and a temperature of -10°C–200°C. The commonly used grades of gray cast iron are: HT200, HT250, HT300, HT500.

2.. Malleable cast iron: suitable for water, steam, air and oil media with a nominal pressure of PN≤2.5Mpa and a temperature of -30-300°C. Commonly used grades are: KTH300-06, KTH330-08, KTH350-10.

3. Nodular cast iron: suitable for water, steam, air and oil with PN≤4.0Mpa and temperature of -30-350°C. Commonly used grades are: QT400-15, QT450-10, QT500-7.

4. Carbon steel (WCA, WCB, WCC): Suitable for nominal pressure PN≤32MPa, suitable for medium and high pressure valves with operating temperature between -29°C and +425°C. Among them, 16Mn and 30Mn work at -29-595°C, and are often used to replace ASTM A105. Commonly used grades are WC1, WCB, ZG25 and high-quality steel 20, 25, 30 and low-alloy structural steel 16Mn.

5. Low temperature carbon steel (LCB): suitable for ethylene, propylene, liquid natural gas, liquid nitrogen and other media with nominal pressure PN≤6.4MPa and temperature ≥-196°C. Commonly used grades are ZG1Cr18Ni9, 0Cr18Ni9, 1Cr18Ni9Ti, ZG0Cr18Ni9.

6. Alloy steel (WC6, WC9), suitable for high temperature and high pressure valves with non-corrosive medium working temperature between -29-595°C; WC5, WC9 are suitable for working temperature between -29-659°C High temperature and high pressure valves for corrosive media.

7. Austenitic stainless steel, suitable for valves with corrosive media with working temperature between -196-600°C.
Eight. Monel alloy: mainly suitable for valves with hydrofluoric medium.
nine. Cast copper alloy: Mainly suitable for valves for oxygen pipelines whose operating temperature is between -29 and 595°C

Fig.1-1 Commonly used valve body material:

valve body material	standard	temp	PN/Mpa	medium
Grey cast Iron		-15/200	≤1.6	water,gas
Black Heart Malleable Cast Iron		-15/300	≤2.5	water, seawater, gas, Ammonia
ductile cast iron		-30/350	≤4.0	water,seawater,gas,air,steam
carbon steel (WCA,WCB,WCC)	ASTM A216	-29/425	≤32	non-corrosive water, oil, gas
Low temp carbon steel (LCB,LCC)	ASTM A352	-46/345	≤32	low temp application
Alloy（WC6，WC9，C5，C12）	ASTM A217	-29/595 -29/650	High pressure	non-corrosive corrosive medium
Austenitic stainless steel	ASTM A351	-196/600		corrosive medium
Monel alloy	ASTM A494	400		Hydrofluoric acid medium
Hastelloy	ASTM A494	649		Strong corrosive medium such as dilute sulfuric acid
Titanium alloy				Various strong corrosive media
Cast copper alloy		-273/200		Oxygen, sea water
Plastic, Ceramic		-60	≤1.6	corrosive medium

Name	material	standard	temp range °C	application
WCB	carbon steel	ASTM A216	-29/425	non-corrosive water, oil and gas
LCB	low temp carbon steel	ASTM A352	-46/345	low temp applicaion
LC3	3.5% nickel steel	ASTM A352	-101/340	low temp applicaion
WC6	1.25% chromium, 0.5% molybdenum	ASTM A217	-30/593	non-corrosive water, oil and gas
WC9	2.25% chromium	ASTM A217	-30/593	non-corrosive water, oil and gas
C5	5% chromium,0.5% molybdenum	ASTM A217	-30/649	light or non-corrosive application
C12	9% chromium 1% molybdenum	ASTM A217	-30/649	light or non-corrosive application
CA15(4)	12% chromium	ASTM A217	704	corrosive application
CA6NM(4)	12% chromium	ASTM A487	-30/482	corrosive application
CF8M	stainless steel 316	ASTM A351	-268/649 when <425, need C=0.04% info	corrosive,ultra low/high temp with no corrosive application
CF8C	stainless steel 347	ASTM A351	-268/649 when <425, need C=0.04% info	high temp, corrosive application
CF8	stainless steel 304	ASTM A351	-268/649 when <425, need C=0.04% info	corrosive,ultra low/high temp with no corrosive application
CF3	stainless steel 304L	ASTM A351	425	corrosive or non-corrosive
CF3M	stainless steel 316L	ASTM A351	454	corrosive or non-corrosive
CN7M	alloy	ASTM A351	425	Good resistance to hot sulfuric acid corrosion
M35-1	monel	ASTM A494	400	Weldable grade, good resistance to common organic acid and salt water corrosion, resistance to most alkaline solutions
N7M	Hastelloy B	ASTM A494	649	Suitable for treating various concentrations and temperatures of hydrofluoric acid, with good resistance to corrosion by sulfuric acid and phosphoric acid
CW6M	Hastelloy C	ASTM A494	649	Very good resistance to strong oxidation, resistance to phosphoric acid, sulfurous acid and sulfuric acid at high temperatures
CY40	Inconel alloy	ASTM A494		Resistant to strong corrosive fluids at high temperatures

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-(1)

August 26, 2020

What material is WCB/LCB/LCC/WC6/WC in the valve?
W, wrought casting; C, Carbon steel; A, B, C indicate the strength value of steel grades from low to high.

lug type butterfly valve-ductile iron

WCA, WCA, WCC represent carbon steel, ABC represents the strength level, and WCB is commonly used. The corresponding pipe material of WCB should be A106B, and the corresponding forging material should be A105.
WC6 is an alloy steel casting, the corresponding pipe material is about A355 P11, and the forging is A182 F11; there is also WC9, high temperature resistant alloy steel, the corresponding pipe material is about A355 P22, and the corresponding forging is A182 F22.
WC: weldable casting
LCB/LCC (ASTM A352) low temperature carbon steel
ITCS is carbon steel with impact toughness; impact test C=carbon S=steel (A350)
Split body split type, side entry side mounted (referring to the actuator), corresponding to TOP entry top mounted type

Commonly used valve casting and forging carbon steel material table

material	country	standard	material grade name
Casting	China	GB/T 12229	WCA	WCB	WCC
			ZG205-415	ZG250-485	ZG275-485
	USA	ASTM A216/A216M	WCA	WCB	WCC
			UNS J02502	UNS J03002	UNS J02503
Forged	China	GB/T 12228 GB/T 699	25 25Mn 35 40 A105
	USA	ASTM A105/A105M	A105

Low temperature casting parts material name and temperature range

C	C	C-Mn	C-Mo	2.5Ni	Ni-Cr-Mo	3.5Ni	4.5Ni	9Ni	Cr-Ni-Mo
LCA	LCB	LCC	LC1	LC2	LC2-1	LC3	LC4	LC9	CA6NM
J02504	J03303	J02505	J12522	J22500	j42215	j31550	j41500	j31300	j91540
-32	-46	-46	-59	-73	-73	-101	-115	-115	-73

Commonly used valve ASTM Casting and Forged material sheet (ASME B16.5)

ASTM Casting	ASTM Forged	China name	Temp °C	suitable medium
Carbon steel
A216 WCB	A105	20	-29/427	water,steam,air,petroleum products
Low temp Carbon steel
A352 LCB	A350 LF2	16Mn	-46/343
A352 LCC	A350 LF2	16Mn	-46/343
High temp alloy
A217 WC1	A182 F1	20MnMo	-29/454	High temp, High pressure medium
A217 WC6	A182 F11	15CrMo	-29/552	High temp, High pressure medium
A217 WC9	A182 F22	10Cr2Mo1	-29/593	High temp, High pressure medium
A217 C5	A182 F5	1Cr5Mo	-29/650	Corrosive high temperature medium
A217 C12	A182 F9	Cr9Mo1	-29/593	High sulfur oxidizing medium
Martensitic stainless steel
A217 CA15	A182 F6a	Cr9Mo1	-29/593	High sulfur oxidizing medium
Austenitic stainless steel（C≤0.08）
A351 CF8	A182 F304	0Cr18Ni9	-196/537	corrosive medium
A351 CF3	A182 F304L		-196/425	corrosive medium
A351 CF8M	A182 F316	0Cr18Ni12Mo2Ti	-196/537	corrosive medium
A351 CF3M	A182 F316L		-196/425	corrosive medium
low carbon Austenitic stainless steel（C≤0.03）
A351 CF3	A182 F304L	00Cr18Ni10	-0.459016393	corrosive medium
A351 CF3M	A182 F316L	00Cr18Ni14Mo2	-196/454	corrosive medium
Special alloy
A351 CN7M	B462Gr.NO8020 (ALLOY20)		-29/149	Oxidizing medium and various concentrations of sulfuric acid
A494 M-30C (Monel alloy)	B4564 Gr.NO4400		-29/482	Hydrofluoric acid, Sea water
Hastelloy H.B H.C				Strong corrosive medium such as dilute sulfuric acid

Notes:
1. Forged valve body material is dense, not easy to have defects, the structure size is not limited by the mold, and the pressure bearing performance is reliable. It is mostly used for high pressure, oxygen working conditions, small diameter or other small batch valve manufacturing, generally at high temperature, Choose forgings under high pressure or low temperature or special medium; castings are generally only suitable for medium and low pressure, and are mostly used for mass production of standardized molded valves.

2. The difference between material A351 CF3M and A182 F316L: the materials corresponding to the two standards are 316 stainless steel. CF3M stands for castings and is often used as valve material. The corresponding forging steel code is A182 F316L. ASTM A216 WCB is a casting, and its forging is A105; the casting of SS304 is A351-CF8, and the forging is A182-F304.

Valve body and material classification

August 24, 2020

The valve body is a main part of the valve; there are different mechanical manufacturing methods according to the pressure level. For example: casting, forging, etc.

lug type butterfly valve body

Material Description
Introduction

Valve bodies of medium and low pressure specifications are usually produced by casting process.
The valve body of medium and high pressure specification is produced by forging process.
It can effectively withstand medium pressure after forming a seal together with the valve core and valve seat sealing ring.
definition
The definition of “valve” is a device used to control the direction, pressure, and flow of fluid in a fluid system. A valve is a device that allows the medium (liquid, gas, powder) in the piping and equipment to flow or stop, and can control its flow

The material of the valve body is selected according to different process media.

Common materials are: cast iron, cast steel, stainless steel, carbon steel, plastic, copper, etc. [1]

Material Description:
1. grey cast iron:

Grey cast iron valves are used in various fields of industry because of their low price and wide application range. They are usually used in the case of water, steam, oil and gas as the medium, and are widely used in chemical industry, printing and dyeing, oil chemical, textile and many other industrial products that have little or no impact on iron pollution. It is suitable for low pressure valves with working temperature between -15～200℃ and nominal pressure PN≤1.6MPa.

2. Ductile cast iron

Ductile cast iron is a kind of cast iron. In this cast iron, the flake graphite in gray cast iron is replaced by clump or nodular graphite. The change in the internal structure of this metal makes its mechanical properties better than ordinary gray cast iron, and does not damage other properties. Therefore, valves made of ductile iron have higher pressures than those made of gray cast iron. It is suitable for medium and low pressure valves with working temperature between -30～350℃ and nominal pressure PN≤4.0MPa. Applicable media are water, sea water, steam, air, gas, oil, etc.

3. Carbon steel:

The initial development of cast steel was to meet the production needs that exceeded the capabilities of cast iron valves and bronze valves. However, because the carbon steel valve has good overall performance and high resistance to stress caused by thermal expansion, impact load and pipeline deformation, it has expanded its use range, usually including the working conditions of cast iron valves and bronze valves. . Suitable for medium and high pressure valves with working temperature between –29～425℃. Among them, the temperature of 16Mn and 30Mn is between -40～400℃, and they are often used to replace ASTM A105. The applicable medium is saturated steam and superheated steam. High and low temperature oil, liquefied gas, compressed air, water, natural gas, etc.

Comparison of pneumatic actuator, electric actuator and hydraulic actuator

August 24, 2020

The valve actuators used in the regulating valve are nothing more than pneumatic, electric and hydraulic:

hydraulic actuator for marine valve

1. Nowadays, most of the actuators used in industrial control places are because they use air source as power, which is more economical than electric and hydraulic, and has a simple structure, which is easy to control and maintain. From a maintenance point of view, it is easier to operate and proofread than other types of actuators, and it is also easy to realize the call of positive and negative on the spot. Its biggest advantage is safety. When using a locator, it is ideal for flammable and explosive environments. If the electrical signal is not explosion-proof or intrinsically safe, there is a potential risk of fire caused by ignition. Therefore, although the application range of electric control valves is becoming wider and wider, in the chemical industry, pneumatic control valves still occupy an absolute advantage.

2. Electric actuators: Electric actuators are mainly used in power plants or nuclear power plants, because the high-pressure water system requires a smooth, stable and slow process. The main advantages of electric actuators are high stability and constant thrust applied by users. The maximum thrust generated by the actuator can be as high as 225000kgf. Only hydraulic actuators can achieve such a large thrust, but the cost of hydraulic actuators is higher than that of electric Much higher. The anti-deviation ability of the electric actuator is very good, and the output thrust moment is basically constant, which can well overcome the unbalanced force of the medium and achieve accurate control of the process parameters, so the control accuracy is higher than that of the pneumatic actuator . If equipped with a servo amplifier, the positive and negative effects can be exchanged easily, and the signal-off valve position state (hold/full open/full close) can be easily set, and it must remain in the original position when it fails. What the pneumatic actuator cannot do, the pneumatic actuator must rely on a set of combined protection system to achieve position retention.

Hydraulic actuator: When we need abnormal anti-deflection ability, high thrust and fast formation speed, we often choose hydraulic or electro-hydraulic actuator. Because of the incompressibility of hydraulics, the advantage of using hydraulic actuators is better anti-deviation ability, which is very important for regulating conditions, because when the regulating element is close to the valve seat, the throttle condition is unstable. The larger the pressure difference, the worse this situation is. In addition, the hydraulic actuator runs very smoothly and responds quickly, so high-precision control can be achieved. The electro-hydraulic actuator integrates the motor, the oil pump, and the electro-hydraulic servo valve. It can work as long as it is connected to the power supply and the control signal. The hydraulic actuator is similar to the cylinder, but it can withstand higher pressure than the cylinder. Work requires an external hydraulic system. The factory needs to be equipped with hydraulic stations and oil pipelines. In contrast, electro-hydraulic actuators are more convenient.

Valve actuator / actuation -(8)- application areas

August 19, 2020

Application areas of valve actuators:
Electric actuators are mainly used in the following three areas:
1. Power plant
Typical applications are:
① Application in thermal power industry
Air blower damper damper, Primary air intake damper, Air preheat damper damper, Flue gas recirculation, Bypass

electric actuator for butterfly valve

damper damper, Secondary air intake damper, Main bellows damper damper, Burner adjustment lever, Burner swing drive, Hydraulic push rod drive, Impeller Machine speed control, flue gas control valve steam, control valve, ball valve and butterfly valve, control sliding gate
②Valve actuator applications in other power industries
Ball valve dust control water jet impeller speed control control large hydraulic valve gas control valve burner ignition start steam control valve condensate recirculation, deaerator, boiler feed water, superheat controller, reheat thermostat controller, and other related valve applications
2. Process control
Used in the production process control of chemical, petrochemical, mold, food, medicine, packaging and other industries, according to established logic instructions or computer programs to accurately position, start and stop valves, tools, pipes, baffles, chutes, platforms, etc. , Opening and closing, rotation, use the temperature, pressure, flow, size, radiation, brightness, chromaticity, roughness, density and other real-time parameters detected by the system to adjust the system to realize the control of intermittent, continuous and cyclic processing .
3. Industrial automation
It is used in a wide range of aviation, aerospace, military, machinery, metallurgy, mining, transportation, building materials, etc., to adjust and control the movement points (moving parts) of various automation equipment and systems.
Examples of main applications in process control and industrial automation are as follows:
① Application in the production of sulphur ore
Water injection flow control ball valve and butterfly valve control
②Application of Potassium Carbonate Pipeline Valve Actuator
Sliding gate diverter Gate ball valve and butterfly valve Ball control valve
③Application of water treatment valve actuator
Liquid flow control, pressure regulator pressure control, acid solution flow control
④Application of valve actuator in limestone/cement plant
Ball or butterfly valve controls the treatment of dry cement, gypsum, or liquid. Air supply and induced draft fan adjustable damper damper bypass damper damper Environmental pollution control and dust removal device sliding door to control the logistics of raw materials in hoppers and storage gates control raw materials in The gas control valve at the feed port adjusts the intake air volume of the burner on the converter. The steam control valve controls the steam required for the production process.
⑤Application of actuators in grain processing plants
Gate Diverter valve Distributor Material unloader/heater Dust removal isolation baffle Air flow control (logistics drying) Ball valve and butterfly valve control
⑥Application of damper and valve actuator in steel mill
Ball or butterfly valve controls, the control of cooling water, wastewater, or other cooling media. Adjustable damper baffle air supply and induced draft fan bypass damper damper, gate Environmental pollution control and dust removal device, Sliding door controls, the flow of raw materials at the inlet to the hopper ,The raw materials in the storage warehouse are subject to logistics control, gas control valve, steam control valve, adjustment of the burner on the converter, and control of the steam required for the production process
⑦The application of damper and valve actuator in aluminum factory
Air blower damper damper, Primary air intake damper, Air preheat damper damper, Flue gas recirculation, Bypass damper damper, Secondary air intake damper, Main bellows damper damper, Burner adjustment lever, Burner swing drive, Hydraulic push rod drive, Impeller Machine speed control flue gas control, valve steam, control valve ball valve, and butterfly valve control, sliding gate
⑧Application of process control baffle
Air replenishment Exhaust fan bypass Hot/cold air mixing Emergency shutdown
⑨Application in petroleum industry
Oil injection process flow control Gas lift pipeline main valve pressure control Water injection process flow control Oil well oil quality sampling test / production valve
⑩Application in natural gas production and transportation industry
Gas lift airflow flow control, Gas pipeline main valve pressure control, Compressor surge control, Natural gas pressure control, Natural gas pipeline main valve pressure control, Emergency shutdown, Natural gas pressure regulator control, Pressure control, Compressor surge control, Flow control

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 actuator / actuation -(7)- generator

August 19, 2020

Generator for valve actuator:
1. The development history of generator controller The automatic control of generator set has experienced relay control. Greatly simplified the control circuit? Reliability has also been improved, to the point of more humanity,

electric actuator for butterfly valve

there are also some generator manufacturers produce small gasoline engine integrated machine, practical and convenient.

2. Diesel generator set structure Diesel generator set is generally composed of three parts: engine, generator and controller. The generator powered by the engine converts the mechanical energy of the engine into electrical energy. The controller is the brain part of the generator set. It not only provides engine start-up, shutdown, data measurement, data display and fault protection functions, but also provides generator power measurement, power display and power protection functions.

3. (i.e. only provide start-up, shutdown and high water temperature, low oil pressure, overspeed protection? Does not provide power display? Water temperature meter, oil pressure meter, hour meter, battery voltmeter, AC voltmeter, AC Ammeter and other instruments), standard type (providing power display, providing protection function? Without communication interface), high-end type (in addition to providing standard functions, but also providing communication interface? Remote control, remote measurement, remote signaling functions are available, some It also has a network interface? It can be monitored through the Internet? Some have a text message function, which is more suitable for unattended computer rooms in remote areas).

Fourth, the inspection steps of the diesel generator set test machine when purchasing diesel generator sets? The customer is most concerned about the price of the generator set? There are many kinds of generator sets according to the brand? And the price of the generator set with different diesel engine power is different , Diesel generator set manufacturers will introduce to you how to compare the prices of diesel generator sets.

One question: Ask about the purchase time of the old diesel engine, ask about the repairs in the past? Which main parts have been replaced? Ask what are the problems in use? In order to have a more comprehensive and systematic understanding of the old diesel engine.

Second look: look at the signs and appearance of the old diesel engine. See which factory produced it? When did it leave the factory? How long did it take? See if the paint on the exterior is peeling off? Is there any defect? Whether the model is eliminated, etc. Judge the degree of newness of the old diesel engine from the label and appearance.

Three trials: Test machine. Check the old diesel engine carefully by shaking the crankshaft, turning the flywheel, starting the machine, etc. Test machine is a very important step? The specific inspection steps are as follows:

1. Rotate the crankshaft to supply oil from the fuel injector. If the fuel injector makes a crisp sound? It means that the performance of the fuel injector and plunger pair is still good. If there is no abnormal noise such as “whipping” in the wheel chamber, it means that the gear wear is not serious.

2. Pull up and down to fly, if there is no noise, it means that the gap between the crankshaft main shaft and the bearing bush is not large.

3. Turn the flywheel so that the piston approaches the bottom dead center? Then shake the flywheel left and right? If there is no “click” sound, it means that the wear between the connecting rod shaft and the bushing is not serious.

4. Decompress the cylinder and sway the crankshaft. When decompression is removed, if the rebound force of the piston is large, the flywheel rotates rapidly, indicating that the degree of wear of the cylinder, piston, and piston ring is small. When cranking the crankshaft, the pointer of the oil pressure gauge should be no less than 1 or the red mark of the oil instruction can rise quickly, and the hand pressure should be laborious.

5. Start the machine, if it is easy to start? The smoke is colorless or light gray? The speed is stable and no noise? It shows that the technical condition of the old diesel engine is good. Remarks: During the testing process of diesel generator set, it is best to operate and track changes in data such as air pressure and oil pressure in the diesel generator controller. Therefore, the stability of the quality of the diesel generator controller has high requirements in terms of humanization and other aspects. This controller is highly evaluated in the market.

6. How to buy diesel generator sets What issues should companies pay attention to when purchasing diesel generator sets? Diesel generator sets are widely used in telecommunications, financial and financial departments, hospitals, schools, commerce and other departments, industrial and mining enterprises and other special purpose independent power supply. Enterprises must have their own standards when purchasing diesel generator sets.

1. The performance and quality of the diesel generator set to be purchased must meet the requirements of relevant standards. The diesel generator set for communication must meet the requirements of the G3 or G4 level in GB2820-1997? At the same time as the “Communication diesel generator set into the network The 24 performance index requirements stipulated in the Implementation Rules for Quality Certification and Testing? At the same time, it must pass the strict inspection of the Communication Power Equipment Quality Supervision and Inspection Center established by the Chinese industry authority. The purchase of diesel generator sets for military communications must meet the relevant GB2820-1997, GJB related standards and the provisions of the “Quality Inspection Standards for Communication Power Equipment” formulated by relevant military departments, and must pass the strict inspection of the equipment quality by the organization department.
2. The main factors that should be considered when purchasing diesel generator sets. The main factors that should be considered when purchasing diesel generator sets are mechanical and electrical performance, the purpose of the unit, the capacity and range of load changes, and automation functions.

1. The purpose of diesel generator set. Because diesel generator sets can be used in three situations: common use, standby and emergency. Therefore, different applications have different requirements for diesel generator sets.
2. Load capacity of diesel generator set. The load capacity and load variation range should be selected according to different uses. Determine the single engine capacity of the diesel generator set and the capacity of the standby diesel generator set.
3. Environmental conditions for the use of diesel generator sets. Mainly refers to altitude and climatic conditions.
4. Selection of diesel generator set
5. Pay attention to generator and excitation mode when purchasing diesel generator set
6. Selection of the automation function of diesel generator set

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 actuator / actuation -(6)-Control panel

August 19, 2020

Control panel of valve actuator:
The main purpose of the control panel is to distribute the electrical energy output by the generator to the user’s load or electrical equipment, and it is also used to indicate the operation of the diesel generator and to keep the

electric actuator for valve

generator’s voltage stable when the load changes. Generally, voltmeters, frequency meters, ammeters, power meters, three-phase current conversion switches, three-phase voltage conversion switches, voltage setting knobs and various indicators are installed on the control panel. For the oil pressure gauge, oil temperature gauge, battery charging ammeter, water temperature gauge, start button and starter electric lock, some of them are directly installed on the control panel according to the design requirements, and some are installed on the dashboard of the diesel engine. The components installed inside the control panel are mainly related to the excitation mode of the generator and the automatic control of the diesel engine. The internal structure of the diesel generator set control panel.

Simple control panels are generally equipped with voltage regulators, silicon rectifier diodes, varistors, automatic air switches, current transformers and other components. More complex control panels must also install overload and short-circuit protection devices, electronic speed regulators, and other components. SCRs, relays, various safety devices and electrical equipment such as small transformers.

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 actuator / actuation -(5)- advantages

August 19, 2020

Advantages of valve actuators:
Actuator companies can establish a complete, efficient, flexible, and integrated marketing information platform

pneumatic actuator for marine valve

through the application of the CRM system, achieve the following goals, and help companies gain advantages in the fierce market competition:

1. Comprehensive and effective management of customer information resources and market competition information;
2. Master every detail of sales opportunities, procurement, sales, contracts, expenses, services, care, etc. throughout the process;
3. Comprehensive and multi-angle analysis of customers, sales and accounts receivable provide a basis for decision-making;
4. Brand-new service and care management thought runs through pre-sales, in-sales and after-sales;
5. All employees realize collaborative office, information release and sharing, and centralized document management
6. The customer relationship management system can enable sales staff to manage customers conveniently and quickly, and record customer information in detail, eliminating the trouble of finding traditional notebooks every day; the system will remind sales staff to do what they should do today; at the same time You can easily determine the type of customers, facilitate the tracking of important customers, and improve work efficiency.
ductile iron, DI, butterfly valve, manufacturer, center line, TH valve
7. The sales staff management system can record sales staff contact business records and event records, and record the whole sales process in detail, which is convenient for the enterprise to grasp all the information of customers. At the same time, the leader can guide the sales staff’s sales process at any time, adjust sales in time, and promote sales. Achieve unified management of sales personnel in all sales outlets, which facilitates the leadership to conduct employee assessment, and at the same time ensures that customer information will not be lost due to employee resignation.
8. The customer service management system can record and track the work of the customer service department throughout the whole process, and the customer service staff can realize task transfer and coordination through the system. Through the system, the customer service departments of all parts of the company can coordinate the tasks organically. Even in different places, they can also accept tasks and achieve collaboration in the shortest time, realizing the promise of “service in place within 24 hours”.

The above briefly analyzes several typical aspects of actuator CRM applications. When facing the production material market or the living material market, the manufacturing of systems/equipment/components, finished products/rough processed products, medicines/food/beverages, durable goods/quick consumables, etc. Products, adaptive business models are different, and the strategies and methods adopted are also different. If your business belongs to the manufacturing industry, if your business organization (sales, service, marketing) implements CRM management.

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-(4)-fastener material

Valve material and valve standards-(3)-sealing material

Valve material and valve standards-(2)-body stem bonnet material

Valve material and valve standards-(1)

Valve body and material classification

Comparison of pneumatic actuator, electric actuator and hydraulic actuator

Valve actuator / actuation -(8)- application areas

Valve actuator / actuation -(7)- generator

Valve actuator / actuation -(6)-Control panel

Valve actuator / actuation -(5)- advantages

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