Welded Bonnet Swing Check Valves — Basic Configuration, ASME Integral Flanged Ends

About this product

PRODUCT FEATURES: • Internal Pin Design. • Body-Bonnet weld to ASME IX. • Integral body flanges. DESIGN TYPE W3 FULL PENETRATION WELD BODY-BONNET CONNECTION

From the catalogue's introduction to this valve type: SWING CHECK VALVES Full die forged structure for all pressure containing parts. Standard construction of body- bonnet connections is bolted bonnet type. Welded bonnet is avaliable as alternative construction. Flanged valves are provided with flanges integral with the body forgings. Standard gasket design for bolted-bonnet valves is spiral wound type up to class ASME 1500. Ring Joint gaskets are standard for ASME 2500 and above. SPW/RJ are available on request for all pressure classes as option. Center-of-gravity location of the disc and swing arm assembly designed in order to minimize pressure drop and suitable for vertical installation as standard: the valve will return to the closed position should flow become interrupted or reversed even with vertical installation (flow must be in an up-flow direction). Internal hinge pin design eliminates additional leakage points. High flow capacity port sizes and disc retraction to minimize flow velocities and maximize valve service life. Design of disc and hinge assembly to generate a closing moment to provide adequate closure and sealing at low pressures. 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. The swing check valve functions by allowing flow forces to move the closure element, it is a hinged clapper which swings or rotates around a supporting shaft. 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. Best-in-Class CV values. Sealing surfaces are machined to the tightest tolerances and lowest roughness to ensure trouble free shut off and cycling. Low cracking pressure design. Swing check nut positively secured to prevent disassembly during service by permanent cold deformation of the closure member. No additional cotter pin or other small parts are used as locking system.