Check valve pdf

In such a design, a wedge slides cross a general passageway in order to control fluid flow (like a sliding gate - hence, the name). Check valves or non return valves are designed to ensure one way flow only. Usually used in water pipework systems and installed immediately after the pump. The most common check valve is the disc type (horizontal or vertical). When flow is sufficient the disc is pushed out.

ANSI-American National Standard Institute B16.

They are available in the sizes, pressure classes and configurations you need to meet the most demanding of applications. Preface Control valves are an increasingly vital component of modern manufacturing around the world. Every valve is tested at a low-pressure setting and at a high-pressure setting. All valves must seal within seconds at the appropriate reseal pressure.

Leak-free, tight sealing, protection against reverse flow and minimal flow direction changes are at the core of Flowserve check valve designs. Also refers to valves which are enclosed in split metal jackets having internal heat passageways or electric heaters. Spring is completely removed from fl ow path Closed As the inlet supply pressure decreases, a light spring closes the poppet, positioning the knife-edge automatically in line of contact sealing against the o-ring.

Must provide a stable base, and installation using flexible couplers is recommended.

Horizontal installation in drainage systems helps keep basements from flooding. Each type of valve has been designed to meet specific needs. Some valves are capable of throttling flow, other valve types can only stop flow, others work well in corrosive systems, and others handle high pressure.

Reliable is one of the world’s largest producers of automatic fire sprinklers and sprinkler system control equipment. Low Prices - Huge PVC Warehouse. Inline check valves can be used as a safety bypass for flow surges through filters and heat exchangers.

With a higher spring rating, they can also be used as a means of generating pilot pressure. Right angle check valves are designed for higher flows with less pressure drop. However, it is worth mentioning that normally the real cause is the wrong style check valve for the application. In such cases, the problem is the applica-tion, not the check valve. Parker’s CP series valve allows free flow in one direction and flow in the counter direction is blocked until pilot pressure unseats the poppet and permits flow in the opposite direction.

Valve Reliable Connections TM No. Each phase of the manufacturing process. The principal types of check valves used are the tee-pattern lift check , the swing check , the tilting-disc check , the Wye-pattern lift check , and the ball check , illustrated in Figs. Duo-Chek offers retainerless designs to API 5end-to-end dimensions in steel bodied wafer and lug style with a wide variety of trim materials including both metal and resilient seats.

A stop- check valve is a check valve with override control to stop flow regardless of flow direction or pressure. When the valve is open, it acts as a check valve , but the valve can be deliberately shut to stop flow. SWING CHECK VALVE DESCRIPTION Swing check valves , like all check valves , are used to prevent back flow in the line.

The pressure of the fluid passing through a system opens the valve , while any reversal of flow will close the valve. Exercise caution when these valves are used for dirty media because that media could cause the disc to stick inside the body bore. 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. Plate valves , Ring type valves and Poppet valves have been compared in natural gas compressors.

The gas engine driven machines of horizontal design operate between 3and 4rpm on a stroke of 3mm. The test confirm the advantages of poppet valves regarding flow and power consumption. Crane also manufactures bronze ball valves , iron wafer and lug butterfly valves , bronze and iron gate globe and check valves , and alloy valves. Brochures and catalogs are available on request.

General Index Figure Number Index FIGURE NO. VALVE TYPE PRESSURE CLASS CONNECTIONS SIZE RANGE PAGE NO. Get Your Backflow in Check.

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.