BB Type Cast Check Valve / Pressure Seal Check Valve Flexible Disc

Pressure seal swing cast check valve 2"-36" CL900-2500, BB type, OS&yoke design

Applicable Standards:

● STEEL CHECK VALVES, API 594/API 6D
● STEEL CHECK VALCES,ISO14313
● STEEL VALVES, ASME B16.34
● FACE TO FACE, ASME B16.10
● END FLANGES,ASME B16.5
● INSPECTION AND TEST, API 598/API 6D

Design descriptions: 

● PSB,PRESSURE SEAL BONNET
● FLEXIBLE DISC, FULLY GUIDED
● RENEWABLE SEAT RINGS
● FLANGED OR BUTTWELDING ENDS

BODY
The body is full ported and spherical in form.The design utilizes large radiuses which allow for the stresses, flow resistance and turbulence to be kept to a minimum. Bosses are provided for optional drains.

HINGE ASSEMBLY
The hinge arm pivots on the hinge pin which is located near the disc’s center of gravity. Body penetration for the hinge pin is sealed with a soft steel gasket and flanged plug. The hinge arm is designed to withstand the shock load of quick closing to insure a longer life and continued shut-off. The hinge arm also has an integral disc stop that provides a positive stop in the open position.

DISC
Each disc’s seating surface is precision ground and mated to the seat ring for insurance of a positive shut off. The disc is secured to the hinge arm with the disc nut and pinned to prevent disengagement during service. We can provide either integral or overlaid seat facings at customer’s request.

SEAT RING
Seat rings are designed to greatly reduce and/or prevent any turbulence and avoid damages due to corrosion. The seat rings are forged or rolled in one piece and then seal welded and overlaid, if required. After welding and all required heat treating, the seat ring faces are machined, thoroughly cleaned and inspected before leaving for assembly.

BOLTS AND NUTS
For normal service conditions, ASTM A194 Class 2H and ASTM A193 Grade B7 nuts and stud bolts are furnished. If specified for high temperature service conditions, ASTM A194 Class 4 and ASTM A193 Grade B16 nuts and stud bolts are furnished. Standard bolting furnished for our stainless steel valves consists of ASTM A194 Class 8 and ASTM A193 Grade B8 nuts and stud bolts.

END CONNECTIONS
Our standard production covers valves with:

1. Flange ends with Raised Face (RF), Flat Face (FF) or Ring Type Joint (RTJ) that conform to B16.5.
2. Butt-welding ends (BW) that conform to B16.25.
3. All face-to-face/end-to-end dimensions conform to B16.10.
4. Other special end connections are supplied according to customer’s requirements.

ACCESSORIES/OPTIONAL DESIGNS
Counterweight features are available as an accessory. Piston, tilting disc or API- 6D designs are also available to meet the customers requirements. Drains and bypasses are available as specified by the customer.