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Valves are classified according to main parameters

Update:12-01-2019
Summary:

By main parameters According to the nominal pressure: ( […]

By main parameters
According to the nominal pressure:
(1) Vacuum valve: refers to a valve whose working pressure is lower than the standard atmospheric pressure.
(2) Low pressure valve: refers to the valve with nominal pressure PN ≤1.6Mpa.
(3) Medium pressure valve: refers to the valve with nominal pressure PN of 2.5Mpa, 4.0Mpa and 6.4Mpa.
(4) High pressure valve: refers to a valve with a nominal pressure PN of 10.0Mpa to 80.0Mpa.
(5) Ultra high pressure valve: refers to the valve with nominal pressure PN≥100.0Mpa.
According to working temperature:
(1) Ultra-low temperature valve: for valves with medium working temperature t<-101°C.
(2) Normal temperature valve: used for valves with medium working temperature -29 °C < t < 120 °C.
(3) Medium temperature valve: used for valves with media working temperature 120 °C < t < 425 °C.
(4) High temperature valve: used for valves with medium working temperature t>425°C.
By drive mode:
According to the driving method, it can be divided into automatic valve type, power driven valve type and manual valve type.
By nominal diameter
(1) Small-diameter valve: a valve with a nominal diameter of DN ≤ 40mm.
(2) Medium diameter valve: a valve with a nominal diameter DN of 50 to 300 mm.
(3) Large-diameter valve: The valve with nominal valve DN is 350-1200mm.
(4) Extra large diameter valve: valve with nominal diameter DN≥1400mm
By structural characteristics
The structural characteristics of the valve are divided according to the direction in which the closure member moves relative to the valve seat:
(1) Truss shape: the closing member moves along the center of the valve seat;
(2) cock and ball: the closing member is a plunger or a ball that rotates around its centerline; such as a plug valve, ball valve
(3) Gate shape: the closing member moves along the center of the vertical valve seat; such as gate valve, gate, etc.
(4) Swing shape: the closing member rotates around the shaft outside the valve seat; such as a swing check valve, etc.
(5) Butterfly shape: the disc of the closing piece rotates around the shaft in the valve seat; such as butterfly valve, butterfly check valve, etc.
(6) Sliding valve shape: the closing member slides in a direction perpendicular to the passage. Slip
By connection method
(1) Threaded connection valve: the valve body has internal or external thread, which is connected with the pipe thread..
(2) Flange connection valve: The valve body is flanged and connected to the pipe flange.
(3) Welded connection valve: The valve body has a welding groove and is welded to the pipe.
(4) Clamp connection valve: The valve body has a clamping mouth and is connected with the pipe clamp.
(5) ferrule connection valve: connected with the pipe with a ferrule.
(6) Matching the connecting valve: a connection form in which the valve and the two pipes are directly clamped together by bolts.
According to the valve body material
(1) Metal material valve: The valve body and other parts are made of metal material. Such as cast iron valves, cast steel valves, alloy steel valves, copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel valves and so on.
(2) Non-metallic material valves: parts such as valve bodies are made of non-metallic materials. Such as plastic valves, enamel valves, ceramic valves, glass steel valves and so on.

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