Archived from the original.
Oxford, UK: Elsevier Advanced Technology.
Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal fitting which can withstand high pressure and which is screwed into the pump head.Flange Insert Valves (F1, F6, FP) can be installed in any flanged connection in the system, horizontally or zelda ocarina of time gamecube rom vertically, with no alterations to existing pipe necessary.In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.Check valves are two-port valves, meaning they have two openings in the body, one for fluid asking alexandria the prophecy bass tabs to enter and the other for fluid to leave.A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid ( liquid or gas ) to flow through it in only one direction.It may be caused by intense rainfall, thaw or flood.A hinged gate only remains open in the inflowing direction.This allows the object to be inflated without continuous or uninterrupted air pressure.It was patented in 1920 (.S.The seating surfaces are parallel to each other, thereby eliminating the excessive wear occurring in plug, cone, and ball seats.Designed with the spring upstream of the seat, strategically placing it outside any mixing and potentially aggressive solutions.8 9 Check valves are also often used when multiple gases are mixed into one gas stream.Many similar pump-like mechanisms for moving volumes of fluids around use check valves such as ball check valves.Valves, piping, and pipelines handbook (3rd.).When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.Piston-driven and diaphragm pumps such as metering pumps and pumps for chromatography commonly use inlet and outlet ball check valves.
There are various types of check valves used in a wide variety of applications.
7 In aircraft and aerospace, check valves are used where high vibration, large temperature extremes and corrosive fluids are present.