17Feb/12, off, one of my customers had a RFQ for a Check valve, and wasn't sure if her customer was wanting a Piston or Swing. .
11 Precision guided closure member for prefect seating surfaces alignment.
The ball is free to rotate, resulting in even wear and a wiping action between the ball and seat.
The valve is installed with the flow under the disc, so that the inlet line pressure and flow rate will force the disc to lift off the seat and allow the line fluid to flow through the valve.
Piston and ball check valves, like all check valves, are used to prevent back flow in the line.8 Low cracking pressure design.3 Flanged valves are provided with flanges integral with the body forgings.Click here, gATE AND, globe valves, bellow seal configuration.2, full die forged structure for all pressure containing parts.My expert engineer explained that the clapper in the swing check valve, is attached to a hinge pin, and swings freely, so when pressure is being applied, it takes very, very, very minimal pressure to make the clapper move.Exercise caution when these valves are used for dirty media because that media could cause the disc to stick inside the body bore.From DN 15 TO.Standard valve design has no spring in order to minimize cracking pressure and pressure drop, it will only function properly when installed in a horizontal line.
I tried to explain to her the difference in a piston check valve and a swing check valve and here is what I came up with.
Click here, gATE AND, globe valves, cryogenic configuration.
Click here, applicable standard range, sIZE, fROM NPS 1/2 TO NPS.
Class, fROM asme 150 TO asme 4500.In a Piston Check it takes more pressure because the movement is up and down.10 Sealing surfaces are machined to the tightest tolerances and lowest roughness to ensure trouble free shut off.7 Best-in-Class CV values.Should the flow suddenly reverse itself, nitro pdf italiano gratis the disc will automatically and quickly, assisted by the weight of the disc, be forced to the closed position, preventing the line fluid from returning.9 Closure member can be spring loaded pendekar ulat sutera pdf for positive closure in any position.Click here, gATE AND, globe valves, basic configuration, catalogue.Ball check valve, the function of ball check valves is similar to the piston check, but the ball check valves use a ball inside the body to control the movement of flow.Symbol, gATE AND, globe valves, basic configuration, catalogue.This feature makes ball checks useful for viscous media.