Technical performance and standards of check valves
Technical performance and standards of check valves
A check valve is a valve that can automatically prevent the backflow of liquid. The valve disc of the check valve opens under the action of fluid pressure, and 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 action of fluid pressure difference and its own gravity to prevent liquid backflow.The main check valve product names of China Check Valve Network include:Two-plate Tiny Drag Slow Close Butterfly Check Valve，Energy-saving Muffler Check Valve，Flange Silent Check Valve，Wafer Silent Check Valve，Chute Rolling-ball Check Valve，Flange Swing Rubber Disc Check Valve，Oversized Silent Check Valve
Main structural features: The valve disc has sufficient strength and rigidity, and the sealing surface of the valve disc can be welded with metal materials or embedded with non-metallic materials according to user requirements; Valve disc limit device to prevent the valve disc from opening too high and unable to close; The large-diameter check valve is designed with lifting rings for easy lifting.
The valve disc of the swing check valve rotates around the axis of rotation. Its fluid resistance is generally lower than that of lift check valves, making it suitable for larger diameter applications.
Technical level: This product is designed and manufactured using international advanced standards and the latest national standards. It is manufactured using advanced processes and fixtures, with flexible opening and closing, reliable sealing, no internal or external leakage, and a long service life, reaching the international advanced level.
Technical parameters:
·Nominal pressure: PN 1.6 MPa
·Nominal diameter: DN 100 mm - DN 300 mm
·Applicable temperature: ≤ -29~425 ℃
·Applicable media: water, steam, oil media
5、 Adopting standards:
·Design and Manufacturing: GB/T12236-89 General Valve Steel Swing Check Valve
·Design and manufacturing: GB/T12235-89 General purpose valve flange connection steel globe valve and lift check valve
·Structural length: GB/T12221-89 Flanged metal valve structural length
(GB/T7306 Pipe Thread)
·Connection end: JB/T79-94 pipeline flange and gasket
·Inspection and Testing: GB/T13927-92 General Valve Pressure Test
·Material selection: JB/T5300-91 universal valve material
·Marking: GB/T12220-89 General Valve Marking
·Supply: JB/T7928-99 General Valve Supply Requirements
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