check valve pdf

A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of

Right Angle Check Valves These valves allow free flow in one direction and prevent flow in the reverse direction. Cracking pressure specified is the pressure required to open the valve and allow free flow. Specifications Model Number Designation Model Numbers Rated Flow * L/min Max. Operating Press. Kgf/cm 2 Cracking Pres. Kgf/cm 2 Mass Kg

Each of these DFT check valves addresses the particular needs of today's customer. DFT's objective is to diagnose check valve problems, provide solutions and 

Check valve Gate valve Globe valve Ball valve Valve shaped like a butterfly. Tight shut-off and can be used as a control valve. Little resistance to flow (allows smooth flow). Optimal for automated operation with a low operating torque and 90 degrees operating angle. Lightweight and compact (large diameter models are also available).

check valves. Our products are manufactured and tested in accordance with respective API, ASME, and ANSI standards. Southern California Valve is a global leader in valve manufacturing for power, paper and pulp, oil and gas, and petro-chemical industries. SCV check valves have serviced critical backflow prevention applications for more than 40

check valve Unloading relief valve Discharge to tank Pressure adjustment Free flow Free Flow. 6 Right Angle Check Valves Right Angle Type Valve Port Size 00 - 1/4" NPT 05 - 3/8" NPT or.7500-16 UNF-2B (.500 tu ) 15 - 3/4" NPT or 1.0625-12 UNF-2B (.750 tu ) 20 - 1" NPT

5. Figure 506 Resilient Hinged Check Valve (Kenflex Check Valve) Rel. 6/18/ Page 4 KENNEDY VALVE Plant and Industrial Group 1021 East Water Street Elmira, New York 14901 Telephone (607) 734-2211 Fax (607) 734-3288 CHECK VALVE RECOMMENDED STORAGE AND HANDLING Whenever possible, Kennedy Valve check valves should be stored inside.

Design Features — The complete line of Check-All® valves are in-line spring-loaded poppet-type check valves. Many series are available to provide check valves for practically every service application. Check-All® valves are available with metal to metal or soft seats. Sizes range from 1/8" NPT to 20 inch flange connections.

Check valves with fixed cracking pressures, C, CP, and CH series, are cycled six times prior to testing . Every valve is tested to ensure it seals within 5 

FireLock™ Series 717 Check Valve. Features an elastomer encapsulated disc with an electroless nickel plated seat. Sizes from 2½ - 12″ | DN65 - DN300. Pressures up to 365 psi | 2517 kPa | 25 bar. General Questions?

FLANGED VALVES The DFT® Model PDC Check Valve. is a silent, non-slam check valve specially designed for use on the discharge side of reciprocating air or gas compressors. It includes a pulse-damping chamber to maintain the disc in the open position during the momentary reductions in flow associated with each cycle of a reciprocating

Series C check valves permit free flow in one direction, and dependable shut-off in the reverse direction. Operation When pressure going through the valve is increased to the cracking level, the valve opens. When the pressure is reduced to below the cracking level, the valve closes. Features • Stainless steel poppets standard.

detectable flow is measured. range would be 16 to 20 psig (1.10 to 1.38 bar). Check valves Re-seal pressure is defined as the downstream pressure at which the having springs with rated crack pressures of 3 psig (0.21 bar) or check valve closes bubble-tight. less may require up to 4 psig (0.28 bar) back pressure to re-seal bubble-tight.

4 Check Valves Cracking and Reseal Pressures at 70°F (20°C) Cracking pressure—the inlet pressure at which the first indication of flow occurs (steady stream of bubbles) . Reseal pressure—the pressure at which there is no indication of flow . Back pressure—the differential pressure between the inlet and outlet pressures .

The stop-check valve can then be used for isolation, regulation and prevention of backflow. Stop-Check Globe Valves STOP-CHECK PERFORMANCES 17 OTHER MODELS AVAILABLE Code: 62 Type: Globe Stopcheck Bonnet: Bolted Handling: OS&Y Sizes: 1/2" - 24" ANSI Class: 150-2500 Code: 61 Type: Globe Stopcheck Bonnet: Threaded & Welded Handling: OS&Y

check valves Check Valves Index 100 Series 1 200/H200 Series 3 2200 Series 9 2300 Series 11 C200 Series 15 C2900 Series 17 400/H400 Series 19 BIVCO Check Valves 23 Circle Seal Controls 2301 Wardlow Circle • Corona, CA 92880 Phone (951) 270-6200 • Fax (951) 270-6201 www.circlesealcontrols.com

valves are typically used in controlling the rate of decompression in a large press before shifting the main valve. Pilot operated valves, like direct operated valves, permit free flow in one direction and prevent flow in the reverse direction. However, pilot operated valves permit reverse flow when a pilot pressure signal is applied to the

Series C check valves permit free flow in one direction, and dependable shut-off in the reverse direction. Operation When pressure going through the valve is increased to the cracking level, the valve opens. When the pressure is reduced to below the cracking level, the valve closes. Features • Stainless steel poppets standard.

A Ball Check Valve consists of a threaded or flanged body with internal features that guide a rubber‐coated ball in and out of the seat as the flow goes forward and reverse. The ball rolls during operation and has a tendency to clean itself. The valve's top access port provides ease of maintenance without removal of the valve from the line.

detectable flow is measured. range would be 16 to 20 psig (1.10 to 1.38 bar). Check valves Re-seal pressure is defined as the downstream pressure at which the having springs with rated crack pressures of 3 psig (0.21 bar) or check valve closes bubble-tight. less may require up to 4 psig (0.28 bar) back pressure to re-seal bubble-tight.

Duo-Chek Valves Duo-Chek high performance non-slam check valves are the original Mission wafer check valves introduced to the market in the late 50's. They are available in the sizes, pressure classes and configurations you need to meet the most demanding of applications. Our product range includes, but is not limited to, • Sizes: 2" to 72"

Swing Check Valves Description: Bolted cover check valves Swing type Non-return BS1868 API6D ASME B16.34 API600 Design Standards: Wall Thickness: Face to Face: End Connection: ANSI B16.10 Raised face Ring type joint ANSI B16.5 ASME B16.47 series A or B BS4504 PN16, 25, 40, 64, etc

Design Features — The complete line of Check-All® valves are in-line spring-loaded poppet-type check valves. Many series are available to provide check valves for practically every service application. Check-All® valves are available with metal to metal or soft seats. Sizes range from 1/8” NPT to 20 inch flange connections.

Inline Check Valve INLET: 1/4" NPT to ASME .201 74.2 mm 75.4 mm MATERIALS LIST OUTLET: 1/4" NPT Male to ASME Bl.201 Size inch 1/4 1/2 22 HEX INLET: 1/2" NPT to ASME 131.201 FLOW DIAGRAM pROCESS DTC Value 0.8 1.2 No. Part Name Bod Packin Ball Seat S rin Bod Material 316ss 304ss 316ss Inconel X-750 316ss DESIGN FEATURES

The Silent Check Valve was designed to open at approximately ¼ to ½ psi (2-3 kPa). This means that when a pump is shut down, a Silent Check Valve will completely close while there is still positive head on the inlet side of approximately ½ psi (3 kPa). In this simple manner reverse flow, which is a major cause of water hammer, is prevented.

Check to see that all valve joints and pressure containing bolts are tight. Leave the valve exposed while the pipeline is being pressurized. Rel.6/18/ Page 4 KENNEDY VALVE Plant and Industrial Group 1021 East Water Street Elmira, New York 14901 Telephone (607) 734-2211 Fax (607) 734-3288 CHECK VALVE RECOMMENDED STORAGE AND HANDLING

check valve Unloading relief valve Discharge to tank Pressure adjustment Free flow Free Flow. 6 Right Angle Check Valves Right Angle Type Valve Port Size 00 – 1/4” NPT 05 – 3/8” NPT or.7500-16 UNF-2B (.500 tu ) 15 – 3/4” NPT or 1.0625-12 UNF-2B (.750 tu ) 20 – 1” NPT

check valves. Our products are manufactured and tested in accordance with respective API, ASME, and ANSI standards. Southern California Valve is a global leader in valve manufacturing for power, paper and pulp, oil and gas, and petro-chemical industries. SCV check valves have serviced critical backflow prevention applications for more than 40

to-open check valves, so care should be taken when select-ing the valve. Performance Data 5CK120 - Check Valve Pilot-to-close, ball type 120 L/min (32 USgpm) • 350 bar (5000 psi) Sectional View Description Pilot to close check valves allow flow to pass in one direc-tion, with a low pressure drop to prevent reverse flow. When

your equipment is to have the right check valve for the job installed correctly. Mr. R. W. Zappe, in his book, Valve Selection Handbook, states that in general a compressor type check valve, such as the Hoerbiger Design, is a good choice for use in gas service. Depending on the flow conditions, the valve may be

AMERICAN's Series 52-SC Swing Check Valves incorporate the following design features to help increase service life. BODIES AND BONNETS.