Gate valve is one of the commonly used cut-off valves, mainly used to connect or cut off the medium in the pipeline, not for regulating the medium flow. Gate valves are suitable for wide range of pressure, temperature and caliber, especially for medium and large caliber pipelines.
Main standards for gate valves
Gb12232-89 "Universal flanged iron gate valves"
Gb12234-89 "Universal flanged and butt-welded steel gate valves"
Globe valve is a commonly used cut-off valve, mainly used to connect or cut off the medium in the pipeline, generally not used to regulate the flow. Globe valves are suitable for a wide range of pressure and temperature, but are generally used for medium and small caliber pipelines.
Main standards for globe valves
Gb12233-89 "Universal valve iron globe valve and lifting check valve"
Gb12235-89 "Universal flanged steel globe valve and lift check valve"
Gb8465.2-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic dimensions of iron globe valve"
Three, throttle valve
Throttle valve is by changing the flow channel section to control the pressure and flow of the fluid, belongs to the control valve class, but because of its structural limitations, there is no control valve regulation characteristics, it can not replace the use of the control valve.
The globe type throttle valve is the same as the globe valve except for the valve starting parts and related parts. Throttle valve opening and closing parts are mostly conical streamline.
Four, butterfly
Butterfly valve is a round disc rotating with the valve stem as the opening and closing parts, in order to realize the opening and closing action of the valve. Butterfly valve is mainly used with truncation valve, can also be designed to have adjustment or truncation and adjustment function. At present butterfly valve is used more and more in low pressure medium and large caliber pipeline.
Main standards for butterfly valves
Gb12238-89 "Universal valve Flanged and clamp connection butterfly valve"
JB/Z248-85 "Static pressure life test specification for butterfly valves"
Five, check valve
Check valves are valves that automatically stop flow back. The disc of the check valve opens under fluid pressure and flows from the inlet side to the outlet side. When the inlet side pressure is lower than the outlet side, the valve disc in the fluid pressure difference, gravity and other factors under the action of automatic closure to prevent fluid flow back.
Gb12233-89 "Universal valve iron globe valve and lifting check valve"
Gb12235-89 "Universal flanged steel globe valve and lift check valve"
GB/T13932-92 "General purpose valves, iron swing check valves"
Six, ball valve
Ball valve is a ball with a round through hole as the opening and closing parts, the ball with the stem rotation, in order to realize the opening and closing action of the valve.
Main standards for ball valves
Gb12237-89 "General purpose flanged and butt welded steel ball valve"
Gb845.3-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic dimensions of iron ball valve"
JB/T53167-94 "Ball valve product Quality grading"
JB/Z246-85 "Static pressure life test specification for ball valves"
Seven, diaphragm valve
Diaphragm valve is a special form of truncation valve, the opening and closing part is a diaphragm made of soft material, which separates the body cavity from the bonnet cavity.
Eight, plug valve
Plug valve is a plug body with a hole as the opening and closing parts, plug body with the stem rotation, in order to realize the opening and closing action of the valve.
The plug body of the plug valve is mostly a cone, but also a cylinder. The plug valve has simple structure, fast opening and closing, and small fluid resistance. Plug valves are usually used for the occasion of low pressure and small caliber.
Plug valve is used to cut off the flow of media, also can be medium distribution, three-way plug valve and four-way plug valve is used to change the direction of the flow of media or media distribution.
Nine, plunger valve
X. Safety valve
Safety valve is used in boiler, pressure vessel and other pressure equipment as overpressure protection device. When the medium pressure in the protected equipment abnormally rises to the specified value, the valve automatically opens, and then the full discharge, in order to prevent the pressure continues to rise, when the pressure is reduced to another specified value, automatically closes.
Main standards for safety valves
Gb12241-89 "Safety valve general requirements"
Gb12242-89 "Safety valve performance test Method"
Gb12243-89 "Spring direct load safety valve"
Zbj98013-89 "Technical requirements for safety valve of power station"
JB/T53170-94 "Spring direct load safety valve product quality classification"
11. Pressure reducing valve
Reducing valve is a kind of regulating valve, it is through the opening and closing of the throttle, the inlet pressure down to a needed outlet pressure, and can be in the inlet pressure and flow changes, the use of the energy of the medium itself to maintain the outlet pressure basically unchanged valve.
Twelve, trap
Steam trap is used in steam pipe network and equipment, can automatically discharge condensate, air and other non-condensing gas, and prevent water vapor leakage valve
Xiii. Sewage valve
Fourteen, regulating valve
The valve is used for regulating the flow of water and steam pipe network, and the self-locking type can keep the pipe network in balance.
