Gate valves are one of the commonly used shut-off valves, mainly used to connect or cut off the medium in pipelines, but are not suitable for regulating the flow of the medium. Gate valves are suitable for a wide range of pressures, temperatures and diameters, especially for medium and large diameter pipelines.
Key words: Valves, classification, definition
I. Gate Valve
Gate valves are one of the commonly used shut-off valves, mainly used to connect or cut off the medium in pipelines, but are not suitable for regulating the flow of the medium. Gate valves are suitable for a wide range of pressures, temperatures and diameters, especially for medium and large diameter pipelines.
The main standards of gate valves
GB12232-89 "General Valves - Iron Gate Valves with Flange Connections"
GB12234-89 "General Valves - Steel Gate Valves with Flange and Butt Welding Connections"
GB8464-87 "General Technical Conditions for Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connections"
GB8465.1-87 "Basic Dimensions of Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connection - Iron Gate Valves"
JB/T53162-91 "Quality Classification of Gate Valves"
JB/T5298-91 "Steel Flat Gate Valves for Pipelines"
JB/Z243-85 "Test Procedure for Static Pressure Life of Gate Valves"
JB/TQ648-88 "Iron Wafer Type Flat Gate Valve"
JB/T53200-94 "Product Quality Classification of Iron Wafer Type Flat Gate Valves"
JB/T53242-94 "Product Quality Classification of Steel Flat Gate Valves"
Ii. Stop valves and throttle valves
A stop valve is a commonly used shut-off valve, mainly used to connect or cut off the medium in pipelines, and is generally not used to regulate flow. Stop valves are suitable for a wide range of pressures and temperatures, but they are generally used in medium and small diameter pipelines.
The main standards of a stop valve
GB12233-89 "General Valves - Iron Globe Valves and Lift Check Valves"
GB12235-89 "General Valves - Steel Globe Valves and Lift Check Valves with Flange Connections"
JB/T53174-94 "Product Quality Classification of Stop Valves"
JB/T53165-92 "Product Quality Classification of High-Pressure Balanced Stop Valves"
GB/T587-93 "Marine Flanged Bronze Stop Valve"
GB/T590-93 "Marine Flanged Cast Iron Stop Valves"
GB8464-87 "General Technical Conditions for Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connections"
GB8465.2-87 "Basic Dimensions of Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connection - Iron Globe Valves"
Iii. Throttle Valve
The throttle valve controls the pressure and flow rate of the fluid by changing the cross-section of the flow passage and belongs to the category of control valves. However, due to its structural limitations, it does not have the regulating characteristics of control valves and thus cannot be used as a substitute for control valves.
The stop type throttle valve is structurally the same as the stop valve except for the valve opening member and related parts. The opening and closing parts of throttle valves are mostly conical streamlined.
Iv. Butterfly Valve
A butterfly valve is a type of valve that uses a circular butterfly plate that rotates with the valve stem as the opening and closing part to achieve the opening and closing actions. Butterfly valves are mainly used as shut-off valves and can also be designed to have the functions of regulation or both regulation and shut-off. At present, butterfly valves are increasingly used in low-pressure medium and large-diameter pipelines.
The main standards of butterfly valves
GB12238-89 "General Valves - Flanged and Wafer Connected Butterfly Valves"
JB/T53171-94 "Product Quality Classification of Butterfly Valves"
JB/Z248-85 "Test Procedure for Static Pressure Life of Butterfly Valves"
V. Check Valve
A check valve is a valve that can automatically prevent 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 automatically closes under the influence of factors such as fluid pressure difference and its own gravity to prevent fluid backflow.
GB12233-89 "General Valves - Iron Globe Valves and Lift Check Valves"
GB12235-89 "General Valves - Steel Globe Valves and Lift Check Valves with Flange Connections"
GB12236-89 "General Valves - Steel Swing Check Valves"
GB/T13932-92 "General Valves - Iron Swing Check Valves"
GB/T589-93 "Marine Flanged Bronze Check Valve"
GB/T592-93 "Marine Flanged Cast Iron Check Valve"
GB8464-87 "General Technical Conditions for Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connections"
GB8465.4-87 "Basic Dimensions of Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connections - Iron Stop Check Valves"
JB/T53036-92 "Product Quality Classification of Check Valves"
Vi. Ball Valve
A ball valve is a type of valve that uses a ball with a circular through hole as the opening and closing part. The ball rotates along with the valve stem to achieve the opening and closing actions.
The main standards of ball valves
GB12237-89 "General Valves - Steel Ball Valves with Flange and Butt Welding Connections"
GB/T15185-94 "Iron and Copper Ball Valves"
GB8464-87 "General Technical Conditions for Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connections"
GB8465.3-87 "Basic Dimensions of Gate Valves, Globe Valves, Ball Valves and Check Valves with Internal Thread Connection - Iron Ball Valves"
JB/T53167-94 "Product Quality Classification of Ball Valves"
JB/Z246-85 "Test Procedure for Static Pressure Life of Ball Valves"
Vii. Diaphragm Valve
A diaphragm valve is a special type 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.
Viii. Plug Valve
A plug valve is a type of valve that uses a perforated plug as the opening and closing part. The plug rotates along with the valve stem to achieve the opening and closing actions.
The plug body of a plug valve is mostly conical, but there are also cylindrical ones. The plug valve has a simple structure, opens and closes quickly, and has low fluid resistance. Plug valves are typically used in situations where the pressure is not high and the diameter is not large.
Plug valves are mostly used to cut off the flow of media and can also be used for medium distribution. Three-way plug valves and four-way plug valves are mostly used to change the direction of medium flow or for medium distribution.
Ix. Plunger Valve
X. Safety Valve
Safety valves are used on pressure-bearing equipment such as boilers and pressure vessels as overpressure protection devices. When the pressure of the medium inside the protected equipment abnormally rises to the specified value, the valve will automatically open and then fully discharge to prevent the pressure from further increasing. When the pressure drops to another specified value, it will automatically close.
The main standards for safety valves
GB12241-89 "General Requirements for Safety Valves"
GB12242-89 "Test Methods for Performance of Safety Valves"
GB12243-89 "Spring Direct Load Safety Valve"
ZBJ98013-89 "Technical Conditions for Safety Valves in Power Stations"
JB/T53170-94 "Product Quality Classification of Spring Direct Load Safety Valves"
Xi. Pressure Reducing Valve
A pressure reducing valve is a type of control valve. It reduces the inlet pressure to a required outlet pressure through the throttling of the opening and closing parts, and can maintain the outlet pressure basically unchanged when the inlet pressure and flow rate change by utilizing the energy of the medium itself.
Twelve. Steam Trap
A steam trap is a valve used in steam networks and equipment that can automatically discharge condensate water, air and other non-condensable gases, and prevent steam leakage
Thirteen. Drain valve
Fourteen. Control Valve
This valve is used in water and steam pipe networks to regulate flow. The self-locking type can keep the pipe network in a balanced state at all times.
Fifteen. Other valves
Pipe clamp valve
Emergency shut-off valve and safety accessories
Solenoid valve
Vacuum valve
Cylinder valve
Multi-purpose valve
Special valves and special valves
Sixteen. Valve Actuator
Manual
Electric
Pneumatic