Gate valve is one of the commonly used shut-off valves. It is mainly used to connect or cut off the medium in the pipeline. It is not suitable for regulating the flow of the medium. The gate valve is suitable for a wide range of pressure, temperature and diameter, especially for medium and large diameter pipelines. .
Keywords: valve, classification, definition
1. Gate valve
Gate valve is one of the commonly used shut-off valves. It is mainly used to connect or cut off the medium in the pipeline, and is not suitable for regulating the flow of the medium. The gate valve is suitable for a wide range of pressure, temperature and diameter, especially for medium and large diameter pipelines.
Main standard of gate valve
GB12232-89 "General valve flanged iron gate valve"
GB12234-89 "General valve flange and butt welding steel gate valve"
GB8464-87 "General technical conditions for internal thread connection gate valve, globe valve, ball valve and check valve"
GB8465.1-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic dimensions iron gate valve"
JB/T53162-91 "Gate valve product quality classification"
JB/T5298-91 "Steel Flat Gate Valve for Pipelines"
JB/Z243-85 "Gate Valve Static Pressure Life Test Regulations"
JB/TQ648-88 "Iron Wafer Type Flat Gate Valve"
JB/T53200-94 "Iron Wafer Type Flat Gate Valve Product Quality Classification"
JB/T53242-94 "Steel flat gate valve product quality classification"
2. Globe valve, throttle valve
The globe valve is a commonly used block valve, which is mainly used to connect or cut off the medium in the pipeline, and is generally not used to adjust the flow. Globe valves are suitable for a wide range of pressure and temperature, but are generally used for medium and small diameter pipes.
Main standard of globe valve
GB12233-89 "General Valves Iron Globe Valves and Lift Check Valves"
GB12235-89 "General valve flange connection steel globe valve and lift check valve"
JB/T53174-94 "Globe valve product quality classification"
JB/T53165-92 "High pressure balance globe valve product quality classification"
GB/T587-93 "Marine flange bronze globe valve"
GB/T590-93 "Marine flange cast iron globe valve"
GB8464-87 "General technical conditions for internal thread connection gate valve, globe valve, ball valve and check valve"
GB8465.2-87 "Internal thread connection gate valve, globe valve, ball valve, check valve Basic dimensions Iron globe valve"
3. Throttle valve
The throttle valve is used to control the pressure and flow of the fluid by changing the cross section of the flow channel. It belongs to the type of regulating valve, but due to its structural limitation, it does not have the regulating characteristics of the regulating valve, so it cannot be used in place of the regulating valve.
The structure of the globe type throttle valve is the same as that of the globe valve except for the valve opening and related parts. The opening and closing parts of the throttle valve are mostly conical streamline.
4. Butterfly valve
The butterfly valve is a valve that uses the circular butterfly plate that rotates with the valve stem as the opening and closing part to realize the opening and closing action. The butterfly valve is mainly used as a cut-off valve, and it can also be designed to have the function of adjustment or cut-off and adjustment. At present, butterfly valves are used more and more in low-pressure large and medium-diameter pipelines.
The main standard of butterfly valve
GB12238-89 "General valve flange and wafer connection butterfly valve"
JB/T53171-94 "Butterfly valve product quality classification"
JB/Z248-85 "Butterfly Valve Static Pressure Life Test Regulations"
Five, check valve
A check valve is a valve that automatically prevents the backflow of fluid. The disc of the check valve opens under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc will automatically close under the action of fluid pressure difference, gravity and other factors to prevent the fluid from flowing back.
GB12233-89 "General Valves Iron Globe Valves and Lift Check Valves"
GB12235-89 "General valve flange connection steel globe valve and lift check valve"
GB12236-89 "General Valve Steel Swing Check Valve"
GB/T13932-92 "General Valve Iron Swing Check Valve"
GB/T589-93 "Marine flange bronze check valve"
GB/T592-93 "Marine flanged cast iron check valve"
GB8464-87 "General technical conditions for internal thread connection gate valve, globe valve, ball valve and check valve"
GB8465.4-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic dimensions iron check valve"
JB/T53036-92 "Check valve product quality classification"
6. Ball valve
The ball valve is a valve that uses a ball with a circular through hole as the opening and closing part, and the ball rotates with the valve stem to realize the opening and closing action.
The main standard of ball valve
GB12237-89 "General valve flange and butt welding steel ball valve"
GB/T15185-94 "Iron and copper ball valves"
GB8464-87 "General technical conditions for internal thread connection gate valve, globe valve, ball valve and check valve"
GB8465.3-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic dimensions iron ball valve"
JB/T53167-94 "Ball valve product quality classification"
JB/Z246-85 "Ball Valve Static Pressure Life Test Regulations"
7. Diaphragm valve
Diaphragm valve is a special form of shut-off valve. Its opening and closing part is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover.
Eight, plug valve
The plug valve is a valve that uses a plug body with a hole as the opening and closing part, and the plug body rotates with the valve stem to realize the opening and closing action.
The plug body of the plug valve is mostly cone, and there are also cylinders. The plug valve has a simple structure, rapid opening and closing, and small fluid resistance. Plug valves are usually used in situations where the pressure is not high and the caliber is not large.
The plug valve is mostly used to cut off the flow of the medium and can also distribute the medium, while the three-way plug valve and the four-way plug valve are mostly used to change the flow direction of the medium or distribute the medium.
Nine, plunger valve
10. Safety valve
Safety valves are used as overpressure protection devices on pressure equipment such as boilers and pressure vessels. When the pressure of the medium in the protected equipment rises abnormally and reaches the specified value, the valve will automatically open, and then discharge in full to prevent the pressure from continuing to rise. When the pressure drops to another specified value, it will automatically close.
Main standard of safety valve
GB12241-89 "General Requirements for Safety Valves"
GB12242-89 "Test method for safety valve performance"
GB12243-89 "Spring direct load safety valve"
ZBJ98013-89 "Technical Conditions for Safety Valves in Power Stations"
JB/T53170-94 "Spring direct load safety valve product quality classification"
Eleven, pressure reducing valve
The pressure reducing valve is a kind of regulating valve. It reduces the inlet pressure to a certain required outlet pressure through the throttling of the opening and closing parts, and can use the energy of the medium itself to maintain the outlet pressure when the inlet pressure and flow change. Basically unchanged valve.
12. Traps
Traps are valves used in steam pipeline networks and equipment, which can automatically discharge condensed water, air and other non-condensable gases, and prevent leakage of water and steam.
Thirteen, drain valve
Fourteen, regulating valve
The valve is used in water and steam pipeline networks to adjust the flow, and the self-locking type can keep the pipeline network in a balanced state all the time.
15. Other valves
Pinch valve
Emergency shut-off valve and safety accessories
The electromagnetic valve
vacuum valve
Cylinder valve
Multipurpose valve
Special valve and special valve
16. Valve drive device
manual
electric
pneumatic