Check Valve

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• Product Code: Check Valve

Check Valves

Bonney Forge valves are available in two bonnet designs. The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F316L/graphite. Ring joint gasket are also available on request. The second design is the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available.

The check valves are also available in three different design configurations. These are piston check, ball check, or swing check designs

Swing Type

The disk swings away from the valve-seat to allow flow in the forward direction, and returns to the valve-seat when upstream flow is stopped, to prevent backflow. Swing check design is one of the most common and best check valve for general-purpose use. These valves produce the lowest pressure drop, when compared with other check valves of the same size, the internal contours and shapes allow them to fully open at low fluid velocities and create a smooth flow path through the valve. The design is simple and easy to maintain and can be used for either horizontal or vertical (fluid flowing upward) pipe layouts. Because of their design, swing checks are not fast-closing valves due to the travel distance from full open to close.

Piston Type

The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. In Piston, or lift, check valves a body-guided disc moves within the body bore. The body guide ensures alignment of the seat and disc when the valve closes. 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. Should the flow suddenly reverse itself, 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. 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.  The ball is free to rotate, resulting in even wear and a wiping action between the ball and seat. This feature makes ball checks useful for viscous media.

Product Range

·         Size                 -           From NPS 1/2 TO NPS 3

·         Class               -           150 to ASME 4500

Applicable Standards

·         Design                        -           API 602 - ISO 15761 - ASME B16.34

·         Inspection & testing   -           API 598

·         Marking                      -           MSS SP-25

·         Rating                         -           ASME B16.34

·         Fugitive emission      -           NA

End connection

·         Face to face               -           ASME B16.10

·         End to end                  -           Manufacturer standard or ASME B16.10

·         Socket weld                -           ASME B16.11

·         Screwed ends(NPT)  -           ASME B1.20.1

·         Flanged ends             -           ASME B16.5

·         Butt welding ends      -           ASME B16.25