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Standards and definitions on valves

hits:461   times:2015/8/22

Valve is one of the common cut-off valve, mainly used to connect or disconnect the line of media, not for regulating media flow. Valve for pressure, temperature and diameter range is large, especially for the large-diameter pipe ʱ??
     Keywords: valves, classifications, definitions
     First, the gate valve
     Valve is one of the common cut-off valve, mainly used to connect or disconnect the line of media, not for regulating media flow. Valve for pressure, temperature and diameter range is large, especially for pipes, large diameter.
     The main gate of the standard
     GB12232-89 "General Valve Flanged iron gate"
     GB12234-89 "universal valve connecting flange and butt weld steel gate"
     GB8464-87 "thread connecting valve, closing valves, ball valves, check valves General technical conditions"
     GB8465.1-87 "thread connecting valve, globe valve, ball valve, check valve basic size iron gate"
     JB / T53162-91 "gate valve product quality grading"
     JB / T5298-91 "Pipeline steel plate gate valve"
     JB / Z243-85 "hydrostatic valve life test procedures"
     JB / TQ648-88 "wafer flat iron gate"
     JB / T53200-94 "steel clip-plate valve product quality grading"
     JB / T53242-94 "steel plate valve product quality grading"
     Second, the shut-off valve, throttle
Shut-off valve is a common cut-off valve, mainly used to connect or disconnect the line of media, is generally not used to regulate traffic. Cut-off valves are suitable for pressure, temperature range is large, but are generally used for pipe, small diameter.
     Cutoff valve main criteria
     
     GB12233-89 "General Valve iron globe valves and lift check"
     GB12235-89 "General Valve Flanged steel globe valves and lift check"
     JB / T53174-94 "shut-off valve product quality grading"
     JB / T53165-92 "high-pressure shut-off valve balance product quality grading"
     GB / T587-93 "Marine bronze flanged globe valve"
     GB / T590-93 "Marine flange cast iron globe valves"
     GB8464-87 "thread connecting valve, closing valves, ball valves, check valves General technical conditions"
     GB8465.2-87 "thread connecting valve, globe valve, ball valve, check valve basic size iron globe valves"
     Third, throttle
     Throttle by changing the flow channel cross section to control the pressure and flow of the fluid, are regulating valves, but because of its structural constraints, not adjusted regulating valve characteristics, it can not replace the regulating valve.
     Cut-off in the structure except throttle valves and the relevant part of Kai, but all the same cut-off valve. Throttle valve opening and closing parts mostly tapered streamlined.
     Fourth, butterfly
     Butterfly is a circular disc with stem rotation for opening and closing member, in order to achieve the opening and closing movement of the valve. Valve shut-off valve is mainly used to use, can be designed to regulate or cut off and regulating functions. Currently butterfly valve in low pressure large diameter pipe is increasing.
     The main criteria butterfly
     GB12238-89 "universal valve flange and wafer butterfly"
     JB / T53171-94 "Butterfly product quality grading"
     JB / Z248-85 "butterfly life hydrostatic test procedures."
     Fifth, the check valve
     Check valve is automatically prevent fluid backflow valve. Check the valve to open under fluid pressure, fluid flows from the inlet side of the outlet side. When the inlet side of the pressure lower than the export side, the valve under fluid pressure factors, such as gravity itself automatically close to prevent fluid backflow.
     GB12233-89 "General Valve iron globe valves and lift check"
     GB12235-89 "General Valve Flanged steel globe valves and lift check"
     GB12236-89 "General Valve Steel swing check valve"
     GB / T13932-92 "General valve iron swing check valve"
     GB / T589-93 "Marine bronze flanged valve"
     GB / T592-93 "Marine flange cast iron valve"
     GB8464-87 "thread connecting valve, closing valves, ball valves, check valves General technical conditions"
     GB8465.4-87 "thread connecting valve, globe valve, ball valve, check valve basic size iron"
     JB / T53036-92 "check product quality grading"
     Six Ball
     Ball is a sphere with a circular through hole for opening and closing pieces, turning ball with stem to realize the opening and closing movement of the valve.
     The main criteria ball
    GB12237-89 "universal valve flange and welded steel ball valves"
     GB / T15185-94 "iron and bronze ball valves"
     GB8464-87 "thread connecting valve, closing valves, ball valves, check valves General technical conditions"
     GB8465.3-87 "thread connecting valve, globe valve, ball valve, check valve basic size iron"
     JB / T53167-94 "ball valve product quality grading"
     JB / Z246-85 "Ball Static life test procedures"
     Seven, diaphragm
     Diaphragm is a special form of cut-off valve, the opening and closing member is a separator made of a soft material, will cover the inner cavity of the valve body cavity separated.
     Eight cock
     Stopcock is perforated plug body as the opening and closing pieces, the plug body with stem rotation to achieve open and close the valve action.
     Plug plug body, mostly cone, there are cylinders, simple plug structure, open and close rapidly, fluid resistance. Plug valves are typically used pressure is not high, the caliber is not the occasion.
     Plug valves are used for cut off media flow, but also for media distribution, three-way stopcock and plug valves are used for changing the flow direction of medium or media distribution.
     Nine, plunger valve
     Ten, safety valve
     Safety valve used in boilers, pressure vessels and other pressurized equipment as overpressure protection device. When the internal pressure is abnormally elevated protective equipment medium reaches a predetermined value, the valve automatically opens, and then the whole amount of emissions in order to prevent the pressure continues to rise, when the pressure is reduced to another predetermined value, automatically shut down.
     The main criteria of the safety valve
     GB12241-89 "safety valve General requirements"
     GB12242-89 "safety valve performance test method"
     GB12243-89 "Spring loaded safety valve"
     ZBJ98013-89 "safety valve power plant technology"
     JB / T53170-94 "Spring loaded safety valve product quality grading"
     XI valve
      Valve is a regulating valve, it is through the throttle opening and closing parts of the inlet pressure is reduced to the outlet pressure of a need, and can at inlet pressure and flow rate changes, the use of the medium itself to keep the outlet pressure energy The valve basically unchanged.
     XII traps
     Traps for steam pipe network and equipment, can automatically discharge condensate, air and other non-condensable gases and steam leaking water blocking valve
     XIII, the drain valve
     Fourth, the control valve
     The valve for water, steam pipe network as regulating the flow purposes, self-locking enables network remains balanced.
     Fifth, other valves
     Pinch Valves
     Emergency shut-off valves and safety accessories
     The electromagnetic valve 
     Vacuum valve
     Cylinder valve
     Multi-valve
     Special valves and special valves
     Sixteen, valve actuators
     Manually
     Electric
     Pneumatic (pump China Network)

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