Standards and definitions for valves

The gate valve is one of the commonly used shut-off valves. It is mainly used to turn on or 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 caliber, especially for medium and large diameter pipelines. .

Keywords: valve, classification, definition I. Gate valve gate valve is one of the commonly used shut-off valves, mainly used to connect or cut off the medium in the pipeline, not suitable for regulating the medium flow. The gate valve is suitable for a wide range of pressures, temperatures and calibers, especially for medium and large diameter pipes.

The main standard of gate valve GB12232-89 "Universal valve flange connection iron gate valve"
GB12234-89 "Universal valve flange and butt weld connection steel gate valve"
GB8464-87 "General technical requirements for internal thread connection gate valve, globe valve, ball valve, check valve"
GB8465.1-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic size iron gate valve"
JB/T53162-91 "Quality Classification of Gate Valve Products"
JB/T5298-91 "Steel slab gate valve for pipelines"
JB/Z243-85 "Regulators for Static Pressure Life Test of Gate Valves"
JB/TQ648-88 "Iron-made clip type slab gate valve"
JB/T53200-94 "Quality Classification of Iron Wafer Type Sliding Gate Valves"
JB/T53242-94 "Quality Classification of Steel Slab Gate Valves"

Second, the stop valve, the throttle 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. The shut-off valve is suitable for pressure and temperature range, but it is generally used for medium and small diameter pipes.

The main standard of the globe valve GB12233-89 "General valve iron shut-off valve and lift check valve"
GB12235-89 "Universal valve flange connection steel shut-off valve and lift check valve"
JB/T53174-94 "Quality Classification of Globe Valves"
JB/T53165-92 "High-pressure balance stop valve product quality classification"
GB/T587-93 "Marine flanged valve for marine flanges"
GB/T590-93 "Marine flanged cast iron globe valve"
GB8464-87 "General technical requirements for internal thread connection gate valve, globe valve, ball valve, check valve"
GB8465.2-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic size iron shut-off valve"

Third, the throttle valve throttle valve is to control the pressure and flow of the fluid by changing the cross section of the flow passage. It belongs to the regulating valve type. However, due to its structural limitation, there is no regulating characteristic of the regulating valve, so it cannot be used instead of the regulating valve.

The cut-off type throttle valve is identical in structure to the shut-off valve except for the valve opening member and related parts. The opening and closing members of the throttle valve are mostly conical and streamlined.

4. Butterfly valve butterfly valve is a valve that uses a circular disc that rotates with the valve stem as a starting and closing member to realize the opening and closing action. The butterfly valve is mainly used with a shut-off valve, and can also be designed to have the function of adjusting or cutting and adjusting. At present, butterfly valves are used more and more on low pressure large and medium diameter pipes.

The main standard of butterfly valve GB12238-89 "Universal valve flange and wafer connection butterfly valve"
JB/T53171-94 "Butter Valve Product Quality Grading"
JB/Z248-85 "Butter Valve Static Pressure Life Test Procedure"

5. Check Valves Check valves are valves that automatically prevent fluid from flowing backwards. The valve flap of the check valve opens under fluid pressure, and the fluid flows from the inlet side to the outlet side. When the inlet side pressure is lower than the outlet side, the valve flap automatically closes under the influence of fluid pressure difference, its own gravity and the like to prevent the fluid from flowing backward.

GB12233-89 "Universal valve iron globe valve and lift check valve"
GB12235-89 "Universal valve flange connection steel shut-off valve and lift check valve"
GB12236-89 "Universal valve steel swing check valve"
GB/T13932-92 "Universal valve iron swing check valve"
GB/T589-93 "Marine flange check valve for marine use"
GB/T592-93 "Marine flanged cast iron check valve"
GB8464-87 "General technical requirements for internal thread connection gate valve, globe valve, ball valve, check valve"
GB8465.4-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic size iron check valve"
JB/T53036-92 "Check Valve Product Quality Grading"

Sixth, the ball valve ball valve is a valve with a circular through hole as a starting and closing member, the ball rotates with the valve stem to achieve the opening and closing action of the valve.

The main standard of ball valve GB12237-89 "Universal valve flange and butt welded steel ball valve"
GB/T15185-94 "iron and copper ball valve"
GB8464-87 "General technical requirements for internal thread connection gate valve, globe valve, ball valve, check valve"
GB8465.3-87 "Internal thread connection gate valve, globe valve, ball valve, check valve basic size iron ball valve"
JB/T53167-94 "Ball Valve Product Quality Grading"
JB/Z246-85 "Bal Valve Static Pressure Life Test Procedure"

7. Diaphragm valve The diaphragm valve is a special type of shut-off valve. The opening and closing member is a diaphragm made of soft material, which separates the valve body cavity from the inner cavity of the valve cover.

8. Plug valve The plug valve is a valve that uses a plug body with a hole as a starting and closing member, 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 a cone and a cylinder. The plug valve has a simple structure, quick opening and closing, and low fluid resistance. Plug valves are often used in applications where the pressure is not high and the caliber is not large.

Plug valves are often used to cut off media flow and media distribution. Three-way plug valves and four-way plug valves are often used to change the direction of media flow or media distribution.

Nine, plunger valve 10, safety valve safety valve used in boilers, pressure vessels and other pressure equipment as an overpressure protection device. When the pressure of the medium in the protected equipment rises abnormally to the specified value, the valve automatically opens and then discharges in full to prevent the pressure from continuing to rise. When the pressure drops to another specified value, it automatically closes.

The main standard of safety valve GB12241-89 "General requirements for safety valves"
GB12242-89 "Safety Valve Performance Test Method"
GB12243-89 "Spring Direct Load Safety Valve"
ZBJ98013-89 "Technical Conditions for Safety Valves of Power Stations"
JB/T53170-94 "Spring Direct Load Safety Valve Product Quality Grading"

11. Pressure reducing valve The pressure reducing valve is a kind of regulating valve. It reduces the inlet pressure to a required outlet pressure through the throttling of the opening and closing member, and can utilize the medium when the inlet pressure and flow rate change. The valve itself maintains a valve whose outlet pressure is essentially constant.

Twelve, trap trap is used in steam pipe network and equipment, can automatically discharge condensate, air and other non-condensing gas, and block the leakage of water vapor valve thirteen, sewage valve fourteen, regulating valve for the valve As the water and steam pipe network is used for regulating the flow, the self-locking type can keep the pipe network in balance.

Fifteen, other valve pipe clamp valve emergency shut-off valve and safety accessories solenoid valve vacuum valve cylinder valve multi-purpose valve special valve and special valve sixteen, valve drive device

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