8-900# WCC Long-Distance Pipeline API 6D Standard Cast Steel Piston-Type Check Valve-Zhejiang FLOWTECH. Machinery Co., LTD.

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Valve

8-900# WCC Long-Distance Pipeline API 6D Standard Cast Steel Piston-Type Check Valve

Classification:

Piston Check Valve

keywords： 8-900# WCC Long-Distance Pipeline API 6D Standard Cast Steel Piston-Type Check Valve

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daviszheng@vezflowtech.com

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Details

The piston-type cushioned check valve utilizes a piston‑guided mechanism to open and close. When the medium flows in the forward direction, it lifts the piston to allow passage; when flow reverses, the medium pressure combined with the cushioning damping device ensures a slow, controlled closure, thereby preventing water hammer–induced damage to pipelines and equipment. The valve incorporates an integral cushioning oil cylinder assembly, enabling adjustable cushioning stroke and controllable closing speed. Its sealing pair is precisely matched, providing tight shut‑off and excellent bidirectional pressure‑resistant sealing. With a smooth flow path and low flow resistance, and available in carbon steel, stainless steel, and other materials, this valve withstands high temperatures and pressures, making it ideal for pump discharge lines, heating systems, petrochemical plants, and water supply and drainage networks. It effectively mitigates pump‑stop water hammer, ensuring the safe and reliable operation of pipeline systems.

Standard Design

When pressure surges and pulsations are prevalent in a flow system,VETZ/FLOWTECH Piston Controlled Check Valves are an efficient solution to system protection.Due to a unique non-slam design, VETZ/FLOWTECH Piston Controlled Check Valves have provided years of uninterrupted service downstream from reciprocating pumps and compressors and in other applications where conventional check valve designs would be subjected to excessive wear.In addition,VETZ/FLOWTECH Piston Controlled Check Valves Top Entry Design allows for easy access and replacement ofall valve internals with minimal downtime.Smooth,Reliable Prevention of Backflow
In the absence of pressure differential, a VETZ/FLOWTECH Piston Controlled Check Valve rests in the closed position due to gravity and spring force.Pressure on the upstream end of the valve lifts the piston off the seat and allows fow.As flow varies the piston of the VETZ/FLOWTECH Piston Controlled Check Valve floats within a cylinder. Should the flow cease,the piston lowers and seats to create a bubble-tight prevention of backflow.A ball check mechanism and an adjacent orifice within the piston extend valve life by dampening piston movement and eliminating slamming or chattering in the event of sudden pressure surges or erratic fow conditions.The orifce size affects the degree of piston movement and is optimally selected at the factory to meet thee requirements of a specifed flow range.
As a result of the piston and seat design the greater the back pressure acting on the piston the tighter the seal.All VETZ/FLOWTECH Piston Controlled Check Valves are designed for horizontal service.Piston Check Valves must be specifcally ordered for vertical fow up when intended for that service Upon request,VETZ/FLOWTECH Piston Controlled Check Valve is prepared to design other sizes and pressure classes of Piston Check Valves.

Item	Part name	Item	Part name	Item	Part name	ltem	Part name
1	Body	5	Disc	9	Gasket-I	13	Cover
2	Seat	6	Guiding Ring	10	Sleeve	14	Bolt
3	Seat Sealing	7	Check Valve	11	Spring(optional)	15	Nut
4	Disc Sealing	8	Throttle Fitting	12	Gasket-Il	16	Venting Fitting

Design Features

· Body:integral or removable seat designs available.Metal or soft sealing are both available.
· Spring(optional):Spring provides positive closure.
· Cover:Easy access to all valve internals through cover.
· Check Valve:Ball Check Valve inside piston allows quick opening.
· Piston:Orifice controls closing speed of piston,dampening piston response to changing flow.The greater the back flow pressure,the tighter the seal.
· A variety of Body and Trim Materials from Trim 1 to Trim 18 acc.to API 600.

For more product parameters, please click to download the PDF file.

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