How to choose a safety valve model for hydraulic pressure test plug valve manufacturers

How to choose a safety valve model for hydraulic pressure test plug valve manufacturers
1. Classification
At present, many valves produced and manufactured have two types: spring type and rod type. In addition, there are impulse valves, pilot operated safety valves, safety conversion valves, safety relief pressure valves, static weight valves, etc.
Spring type safety valves rely on the interaction force between springs and yellows to operate. Spring type safety valves come in both closed and non closed types. Generally, flammable, explosive, or harmful substances should be treated with closed types, while steam or rare gases can be treated with non closed types. Spring type safety valves also come with or without a wrench.
The key to the effectiveness of a wrench is to check the flexibility of the valve disc, and sometimes it can also be used as a manual emergency pressure relief. Rod type valve
It relies on the interaction force between the rod and heavy hammer, but the use of rod and heavy hammer valves is usually limited due to their large volume. When the temperature is high, use valves with heat pipe radiators.
The basic parameter of a valve is the displacement, which is determined by the specifications of the high-pressure gate valve and the opening aspect ratio of the valve disc. The opening aspect ratio varies,
It is divided into two types: micro opening and full opening.
Micro opening refers to the opening aspect ratio of the valve disc being 1/40 to 1/20 of the throat diameter of the high-pressure gate valve.
Fully open type refers to the opening aspect ratio of the valve disc being 1/4 of the throat diameter of the high-pressure gate valve.
2. Valve adoption
The scale of the valve is determined by the actual operating pressure, the application temperature range of the valve is determined by the working temperature, the uniformity range of the spring or stem is determined by the calculated valve uniformity value, and the material and construction form of the valve are determined based on the application material,
Calculate the throat diameter of the valve based on the increase in valve discharge capacity. The following are general standards adopted for valves.
(1) Boilers generally use non enclosed micro opening safety valves with wrenches.
(2) Gas steam boilers or steam pipelines generally use non enclosed full opening safety valves with wrenches.
(3) Liquid substances such as water that cannot shrink are generally treated with closed micro opening safety valves or safety relief valves.
(4) High pressure water supply and drainage generally use closed micro opening safety valves, such as high-pressure water supply and drainage electric heaters, heat exchangers, etc.
(5) Generally, enclosed fully open safety valves are used for substances with high fluid density, such as air compressor storage tanks and vapor pipelines.
(6) E-class gas steam boilers generally use static weight valves.
(7) Large scale, high horsepower, and high-pressure system software generally use single pulse valves, such as temperature and pressure reduction devices, power plant heating furnaces, etc
(8) Train tank trucks, small car tank trucks, storage tanks, etc. for transporting liquefied petroleum gas generally use internal window valves.
(9) The top of the oil storage tank is generally equipped with a hydraulic safety valve, which needs to be used in conjunction with a breathing valve.
(10) Pilot operated safety valves are generally used for mine drainage pipelines or natural gas pipelines.
(11) A safety reflux valve is generally used on the return pipeline of the compressed natural gas station tank pump inlet and outlet.
(12) System software that may cause air pressure during air pressure or operation processes generally uses vacuum pumps and air pressure valves.
(13) Metal bellows valves are commonly used for vessels or piping systems with significant back pressure fluctuations and hazardous flammability.
(14) System software with low material condensation point generally uses insulated jacket valves.