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Swing cast check valve 2"-36" CL150-1500 RF, BB type, OS&yoke design
APPLICATION & FUNCTION
Swing check valves are designed to close quickly and automatically with positive shut off in either horizontal or vertical (flow up) pipe runs. Inherently, swing check valves have a low pressure drop and are best suitable for velocity applications. Our closure design allows our swing check valve to close completely even and remain closed with no flow when installed in a horizontal pipe run.
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:
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.
Technical parameters and characteristics:
Product description | Swing check valve |
Model | Swing check valve |
Nominal diameter | NPS 2”~NPS 50” |
Operating temperature | -196℃~593℃(the range of service temperature may vary for different materials) |
Operating pressure | CL150-CL2500 |
Material | A216 WCB,WCC;A217 WC6,WC9,C5,C12,C12A,CA15;A351 CF8,CF8M,CF3,CF3M,CF8C,CN3MN,CK3MCUN,CN7M;A352 LCB,LCC;A494 CW-6MC,CU5MCuC,M35-1;A995 4A(CD3MN),5A(CE3MN),6A(CD3MWCuN);ASME B 148 C95800,C95500, etc. |
Design standard | API 6D,API 594,BS 1868,ASME B16.34,GB 12236,GB 12224 |
Structural length | ASME B16.10 |
Connecting end | ASME B16.5,ASME B16.25,GB 9113,GB 12224 |
Test standard | API 598,ISO 5208,JB/T9092,GB/T13927 |
Operation method | The valve clack can be automatically opened and closed with the medium force, movement weight can be increased to facilitate fast closing of valve clack, hydraulic cylinder can be increased to facilitate slow closing of valve clack to prevent vibration of pipeline, and pigging can be performed through manual opening and locking the valve clack at the opening position. |
Application fields | For application in fields such as electric power industry, petroleum refining, petrochemical engineering, offshore oil, tap water engineering in urban construction, chemical engineering, etc. |
Other remarks 1 | The sealing faces of valve seat and valve clack are build-up welded with hard alloy to improve the erosion resistance and extend the service life of valve. |
Other remarks 2 | SS+ graphite or metallic seal or pressure self-sealing is adopted between valve body and bonnet for reliable sealing. |
Other remarks 3 | Suitable for medium backflow prevention in pipeline or device |
Other remarks 4 | Large check valves are designed with hydraulic damping cylinder to prevent the valve clack from bumping the valve seat, damaging the valve or causing pipeline vibration due to fast closing. |
Other remarks 5 | In case of pigging requirement, API 6D swing check valve can be manually operated to fix the opening position of valve clack, so as to achieve the pigging objective. |