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Pneumatic butterfly valve installation instructions

July 29, 2021

Pneumatic butterfly valve installation instructions and steps
Whether the pneumatic butterfly valve is installed well will affect the efficiency of the equipment. And the maintenance of the pneumatic butterfly valve is also related to the performance of the equipment. Improper installation or lack of maintenance will cause the performance of the butterfly valve to decline, and even unnecessary dangers. The user should check and maintain the pneumatic butterfly valve as scheduled.

D673H-16C-stainless steel pneumatic triple eccentric butterfly valve

1. Before installation, check that all parts of the pneumatic butterfly valve are not missing, the model is correct, there is no debris in the valve body, and there is no blockage in the solenoid valve and muffler;
2. Put the valve and cylinder in the closed state.
3. Hit the cylinder against the valve (the installation direction is either parallel or perpendicular to the valve body), and then check whether the screw holes are aligned, there will be no too much deviation, if there is a little deviation, just rotate the cylinder body a little. , And then tighten the screws.
4. After installation, debug the pneumatic butterfly valve (the air supply pressure is 0.4~0.6MPa under normal circumstances), and the solenoid valve must be opened and closed manually during the debugging operation (the solenoid valve coil can only be operated manually after the solenoid valve coil is de-energized). Observe the opening and closing of the pneumatic butterfly valve. If the valve is found to be a bit difficult at the beginning of the opening and closing process during the debugging operation, and then it is normal, you need to reduce the stroke of the cylinder (the stroke adjustment screws at both ends of the cylinder should be adjusted inward at the same time, and the valve should be moved to the open position during adjustment. , Then turn off the air source and adjust again) until the valve opens and closes smoothly and closes without leakage. It should also be noted that the adjustable silencer can adjust the opening and closing speed of the valve, but it should not be adjusted too small, otherwise the valve may not operate.
5. Defa should be kept dry before installation, and should not be stored in the open air;
6. Check the pipeline before installing the butterfly valve to ensure that there is no foreign matter such as welding slag in the pipeline;
7. The manual opening and closing resistance of the butterfly valve body is moderate, and the torque of the butterfly valve matches the torque of the selected actuator.
8. The flange specification for butterfly valve connection is correct, and the pipe clamp flange conforms to the

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

butterfly valve flange standard. It is recommended to use special flanges for butterfly valves instead of flat welding flanges.
9. Confirm that the flange welding is correct. After the butterfly valve is installed, the flange must not be welded to avoid scalding the rubber parts.
10. The installed pipe flange should be centered and centered with the inserted butterfly valve.
11. Install all the flange bolts and tighten them by hand. It will be confirmed that the butterfly valve and the flange have been aligned, and then the butterfly valve will be opened and closed carefully to ensure flexible opening and closing.
12. Fully open the valve. Use a wrench to tighten the bolts in diagonal order. No washers are needed. Do not overtighten the bolts to prevent serious deformation of the valve ring and excessive opening and closing torque.
Related knowledge: Installation instructions for ventilation butterfly valves; Installation instructions for telescopic butterfly 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

The difference between a float valve and a ball valve

July 20, 2021

The difference between a float valve and a ball valve, the principle of the float valve | diagram
Float valve is a product of liquid level measurement and control. It is constructed by several main components such as valve body, piston, connecting rod and floating ball, and uses the principle of leverage to make the valve open or block. In the simplest way, it is like a flush toilet at home, and the water supply device used on it has this structure.
The difference between float valve and ball valve:

electric ball valve

The ball valve is a kind of valve, which refers to the valve core (sealing part) of the valve with a spherical structure, which is used in the pipeline to block air or water flow; the float valve is because one end of the switch lever is a hollow sealing ball, Automatically control the opening and closing of the valve through the buoyancy of the liquid. One word difference is very different.

The working principle of the float valve|Illustration:
The float valve floats must always float on the water. When the water surface rises, the float also rises. When the

principle of the float valve diagram

water level of the water tank is low, the floating ball decreases with the water level, and the piston in the valve body is pulled out through the connecting rod of the fixed floating ball, so that the valve body and the piston are hollowed out, so that the tap water can enter the water tank; when the water level of the water tank is set When the height position is high, the force generated by the floating ball as the water level rises pushes the piston in the valve body into the valve body through the connecting rod. Because the top of the piston is equipped with a sealing rubber gasket, the water outlet in the valve body is processed relatively flat and smooth. When the buoyancy of the floating ball exceeds the pressure of the tap water, the piston with the sealing rubber gasket and the water outlet in the valve body are tightly sealed, and the tap water is closed by the floating ball valve.
Floating ball valve function: control the water level of the pool or water tank not to exceed a certain set value, and the valve can only be opened within a set time period. Floating ball valve is applicable: used in the reservoir system of the tap water supply pipe network to avoid opening the reservoir inlet valve during peak water consumption and reduce the pressure of the water supply pipe network. The valve can only open when the water is low.
Click to view: Principle of Ball Valve Principle of Electric Ball Valve Principle of Pneumatic Ball Valve

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

Fluorine-lined valve instructions | Installation instructions

June 7, 2021

Fluorine-lined valve instructions | Installation instructions
1 The fluorine-lined valve flange cover cannot be opened at will. Unless it is ready to be connected to the pipeline, the PTFE flange surface may be bumped, scratched or deformed due to temperature differences and foreign objects, which may affect the sealing. If the cover is moved due to inspection needs, It is also necessary to quickly reset the cover plate after inspection to protect the PTFE flange surface.

Fluorine lined butterfly valve-PTFE-WAFER (9)

2 When the fluorine-lined valve is connected to the pipeline, the gasket is generally no longer used alone, but when it is connected with the flange surface of dissimilar materials (metal surface, etc.), appropriate gaskets should be used to protect the PTFE flange surface.
3 During the use of the fluorine-lined valve, if a leak occurs at a higher temperature, the system temperature should be lowered to room temperature first, and then the cause should be investigated and repaired.
4 During installation, the flange nuts should be evenly tightened in the diagonal direction (symmetrically), and matched with appropriate torque: a If the flange sealing surface leaks and the leak location nut is locked, the leak location nut should be loosened at this time Half a circle, and then apply the same torque to the opposite side to lock it again; b If the above method still does not stop the leakage, check whether the PTFE flange surface has unevenness, indentation, scratches, and then it can be leveled with fine gauze paper or cloth. reconnect.
5 It is not allowed to do any high temperature welding work on the fluorine-lined valve to avoid permanent damage to the lining layer.
6 Fluorine-lined valves should be stored in a dry and ventilated room. Stacking is strictly prohibited.
7 Fluorine-lined valves after maintenance must be tested and qualified according to relevant standards before they can be installed.
8 When manually operating the fluorine-lined valve, it is not allowed to force the valve to be opened or closed with the help of other levers.
9 When installing fluorine-lined valves with directional requirements, pay attention to the flow of the medium in the direction indicated by the arrow on the valve body, and ensure convenient operation and maintenance.
10 The sealing pair of fluorine-lined valves stored for a long time should be in a slightly separated state to avoid permanent deformation of the sealing surface under long-term pressure, which will affect the sealing performance and service life.

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 seal (ring) material usage range comparison table

June 4, 2021

Valve seal (ring) material usage range comparison table
The selection of valve sealing material is determined according to the operating conditions of the valve, such as:

marine valve seat

pipeline medium, temperature range (high and low temperature), pressure, and internal structure of the valve. For different occasions, the selected seals are also different. Valve seals can generally be divided into two categories, soft seals and hard seals. Users should have a detailed understanding of their codes, operating temperature, pressure, medium and other parameters.

Comparison table of valve sealing material usage range:

Valve sealing material	Use range of valve sealing material
Rubber (X)	Nominal pressure PN ≤ 1 MPa, operating temperature t ≤ 150℃, applicable valves: globe valve, diaphragm valve, butterfly valve, check valve, etc.
Nylon (N)	Nominal pressure PN ≤ 32 MPa, operating temperature t ≤ 90℃, applicable valves: globe valves, ball valves, etc.
Polytetrafluoroethylene (F)	Nominal pressure PN ≤ 6.4 MPa, operating temperature t ≤ 180℃, applicable valves: globe valve, ball valve, gate valve, diaphragm valve, butterfly valve, check valve, etc.
Bus alloy (B)	Nominal pressure PN ≤ 2.5 MPa, operating temperature t ≤ 150℃, applicable valves: stop valves for ammonia, etc.
Ceramics (G)	Nominal pressure PN ≤ 1.6 MPa, operating temperature t ≤ 150℃, applicable valves: ball valves, plug valves, etc.
Enamel (C)	Nominal pressure PN ≤ 1.0 MPa, operating temperature t ≤ 80℃, applicable valves: globe valve, diaphragm valve, check valve, discharge valve, etc.
Copper alloy (T)	Nominal pressure PN ≤ 1.6 MPa, operating temperature t ≤ 200℃, applicable valves: gate valve, globe valve, check valve, plug valve, etc.
Stainless steel (H)	Nominal pressure PN ≤ 32 MPa, operating temperature t ≤ 450°C, applicable valves: globe valves, ball valves (medium and high pressure valves), etc.
Nitrided steel (D)	Nominal pressure PN ≤ 10 MPa, operating temperature t ≤ 540℃, applicable valve: power station gate valve, only for general use
Cemented carbide (Y)	Nominal pressure (PN) and operating temperature (t) are determined according to the material of the valve body. Applicable valves: high-pressure, ultra-high-pressure valves, high-temperature and low-temperature 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

The difference between American, Germany and China standard valve

November 2, 2020

The difference between American standard valve, German standard valve and China standard valve

lug type butterfly valve, ductile iron, center lined,

(American Standard, German Standard, National Standard) The difference between the valves:
First of all, it can be distinguished from the standard codes of various countries: GB is the national standard, the American standard (ANSI), and the German standard (DIN). Secondly, it can be distinguished from the model. The valve model of the national standard is named according to the pinyin letter of the valve category. For example, the safety valve is A, butterfly valve, D, diaphragm valve, G, check valve, H, globe valve, J, throttle valve, L, drain valve, P, ball valve, Q, trap, S, gate valve, and so on. ,
There are no special specifications between American standard valves, German standard valves, and national standard valves. It is nothing more than the difference between production standards and pressure levels. The material of the valve body and internal parts are easy to say, it is nothing but cast iron, cast steel, stainless steel, etc. Taking the American standard as an example, the pressure level of the American standard ranges from 125LB to 2500LB (or 200PSI to 6000PSI), and the main standard is API, ANSI, commonly referred to as API, and ANSI valves are American standard valves; German standard valve pressures are usually PN10 to PN320. DIN standard; if the valve is flanged, the corresponding flange standard must be adopted. The world’s main valve standards are also the American Standard Petroleum Institute API standard, the American national standard ANSI, the German standard DIN, the Japanese standard JIS, the national standard GB, the European standard EN, and the British standard BS. ,
Simply put, American standard valves are valves designed, manufactured, produced and tested according to American standards. German standard valves are valves designed, manufactured, produced and tested according to German standards. The national standard valve is the valve designed, manufactured, produced and tested according to our country’s standard. The differences between the three are roughly as follows: 1. The flange standards are different; 2. The structural length is different; 3. The inspection requirements are different.
National Standard Valves American Standard Valves German Standard Valves (American Standard, German Standard, National Standard) Valve Standards: Chinese National Standards (GB) Chinese Ministry of Machinery Standards (JB) American National Standards (ANSI) American Petroleum Institute Standards (API) American Society for Testing and Materials Standards (ASTM) American Valve and Fitting Manufacturers Standardization Association Standards (MSS) Japanese Industrial Standards (JIS) German National Standards (DIN) French National Standards (NF) British National Standards, European Standards (BS, EN) Other National Valve Standards ( ГOCT, IEEE, UL)

Tianjin Tanghai Valve Manufacturing Co., Ltd. is one of the largest butterfly valve manufacturers in China. It was founded in 2006. Its predecessor was Tanghai Valve Manufacturing Factory. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services.

After 14 years of continuous development and innovation, the company now has a group of high-tech engineers, technicians and skilled production workers, advanced production technology, sophisticated manufacturing equipment, complete testing methods, in strict accordance with international standards and quality management system, formed A comprehensive quality control network.

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.

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

Current status and development of Chinese valves

August 18, 2020

Domestic status: In terms of technical support for valve production and R&D, domestic valves are not lagging behind foreign valves. On the contrary, many products are comparable to international companies in terms of technology

lug type butterfly valve-ductile iron

and innovation. The development of the domestic valve industry should move towards high-end modernization.

Driven by the four major forces of industrialization, urbanization, reform and globalization, the prospects of my country’s valve equipment manufacturing industry are still broad. In the future, high-end, localization, and modernization of the valve industry will be the main development direction of the valve industry in the future. Pursuing continuous innovation and creating a new market for valve companies can enable companies to survive and develop in the increasingly competitive pump and valve industry.

With the continuous development of valve technology and the continuous expansion of valve application fields, corresponding valve standards are becoming more and more indispensable. The valve industry products have entered a period of innovation. Not only the product categories need to be updated, but the internal management of the enterprise also needs to deepen the reform according to the industry standards.

Therefore, it is necessary to make full use of existing standards while looking forward to the future, and to develop new standards and new systems that can be used in the future, so as to promote the higher-level development of valve technology. In the future, the valve industry will develop in two main directions: one is to develop from a single variety to multiple varieties and specifications; the other is to develop in the direction of energy saving.

According to industry insiders, pump and valve companies can only effectively and clearly understand the status quo of the industry, continuously strengthen and optimize their products, strengthen their awareness of danger, strengthen corporate culture and market service concepts, and only achieve fastness in stability, refinement in fastness, and stability in refinement. Only in this way can companies survive and develop in the increasingly competitive pump and valve industry.

The society is an era of information explosion. It is inevitable for companies to encounter competitors in products. There is competition in the industry, which is a good thing for some companies. Because of competition, enterprises have improved the quality of products and services, and consumers have obtained better or more consumption and services with less money. The market is a “screen”. While the industry is developing and progressing, the market is also surviving the fittest enterprises in the industry. Although the current status of the development of the butterfly valve industry is gaining momentum, the national support policies have been greatly improved, and the market demand has continued to increase. Due to the fierce competition in the industry, the pump and valve industry has also made domestic pump and valve related technologies to improve, but many interference factors indicate The development prospects of the pump valve industry are not optimistic.

For some large competitive enterprises, through competition, the scale of the enterprise has become larger and larger, and the popularity has become higher and higher. However, for some small and medium-sized enterprises that are not competitive, they may face the risk of being merged or going bankrupt. In the increasingly fierce valve market, only companies with core competitiveness can gain a foothold in the market, and innovation becomes a weapon for companies to win the market.

Valve cleaning steps and assembly requirements

August 18, 2020

Valve cleaning steps:

The valve parts must go through the following processes before assembly:

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

According to the processing requirements, some parts need to be polished, and the surface must not have processing burrs, etc.;
All parts are degreased;
After degreasing is completed, pickling passivation is carried out, and the cleaning agent does not contain phosphorus;
Rinse with pure water after pickling and purification, and there should be no residues of medicament, and this step is omitted for carbon steel parts;
Dry the parts one by one with a non-woven cloth, and do not leave the surface of the parts such as wire wool or dry with clean nitrogen;
Use non-woven fabric or precision filter paper dipped in analytical pure alcohol to wipe each part until there is no dirty color.

Valve assembly requirements:

The cleaned parts must be sealed and stored for installation. The requirements for the installation process are as follows:

The installation workshop must be clean, or set up a temporary clean area, such as newly purchased color striped cloth or plastic film, to prevent dust from entering during the installation process.
Assemblers must wear clean cotton overalls, cotton caps, no leakage of hair, clean shoes on feet, and plastic gloves on hands.
Assembly tools must be degreased and cleaned before assembly to ensure cleanliness.

other requirements:

1. Purge the assembled valve with nitrogen for at least 1 minute.
2. The air tightness test must use pure nitrogen.
3. After passing the air tightness test, encapsulate and seal with a clean polyethylene cap. The polyethylene cap should be soaked in organic solvent and wiped clean before use.
4. Then seal it with a vacuum bag.
5. Final packing.
6. Measures must be taken to ensure that the package is not damaged during transportation.
4. Acceptance requirements
The acceptance is followed. Before assembly, each component is wiped with clean precision filter paper. If the dead corner of the component is selected, the filter paper does not change color as qualified.

Tanghai Valve is the best manufacturer of valves in China. We produce the best quality products with competitive low prices. Tianjin Tanghai Valve Manufacturing Co., Ltd. is one of the largest butterfly valve manufacturers in China, main products are butterfly valves, check valves, gate valve and globe valves. Key words: butterfly valve, lug type butterfly valve, wafer type butterfly valve, U-type butterfly valve, double flange butterfly valve, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…)

Posts

Pneumatic butterfly valve installation instructions

The difference between a float valve and a ball valve

Fluorine-lined valve instructions | Installation instructions

Valve seal (ring) material usage range comparison table

The difference between American, Germany and China standard valve

Current status and development of Chinese valves

Valve cleaning steps and assembly requirements

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Triple eccentric butterfly valve (TH-BTV-TE)

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