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double disc check valve.Válvula Check.Dual çek Valf.VáLVULA RETENçãO,VáLVUL
Detailed Product Description
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Material: WCB Flanged End: RF
Size: 18" Pressure: 150LB
ANSI/API dual disc wafer check valve
double disc check valve.Válvula Check.Dual çek Valf.VáLVULA RETENçãO,VáLVULA
RETENçãO DUPLEX 150 LBS.Klapka zpětná.Клапиdouble disc check valve.Válvula
Check.Dual çek Valf.VáLVULA RETENçãO,VáLVULA RETENçãO DUPLEX 150 LBS.Klapka
Double Disc Check Valves, also called wafer check valves are designed to be
installed between ANSI 150, 300, 600,900 or 1500LB flanges. These valves should
not beinstalled between flanges that contain defects.
Prior to installation, the wafer ends and mating flanges should be inspected to
ensure gasket surfaces are free of defects. The piping system must also be checked
for proper alignment.
Double Disc Check Valves should never be utilized to realign an existing piping
system. Our Dual Plate Check Valves are designed for steady flow conditions and
can be installed in either horizontal orvertical (flow upwards) pipelines.
The valve rib must be installed perpendicular to the flow. This is shown in the
diagram below. The eyebolt is locateddirectly above the valve rib and can be used
to correctly position the valve.
Check Valves must be installed with the flow direction upward. In this position,
the outlet will be above the inlet. It is also necessary to orientate the valve
rib such that there is equal loading on the dual plates. This is illustrated in
the diagram below. Additional pressure drop should be expected due to the weight
of the discs.
double disc check valve installation
When positioning the Check Valve, ensure that the arrow on the body of the valve
points in the direction of the flow.
During installation, it is important to support and align the check valve and the
adjacent piping. Install a standard, ANSI flange gasket between valve and flange,
on both sides. Install lubricated flange bolts and hand tighten. Flange bolts
should then be tightened using a star or crisscross pattern to evenly load the
For efficient function and improved service life, recognized piping standards
stipulate placing Check Valves 5 to 10 pipe diameters from any turbulence
producing devices.Dual Plate Check Valves are designed for steady flow conditions
and are not recommended for low flow,reciprocating flow, pulsating flow, or
parallel pumping station. Dual Plate Check Valves are designed to operate properly
for flow rates between 5 ft./sec to 10 ft./sec. It is not recommended to exceed
the maximum flow rate of 10 ft./sec or the minimum flow rate of 5 ft.
Installation is complete when the wafer ends are flush against the mating flanges
and no gaps are present.
Dual Plate Check Valves are designed to automatically prevent backflow in systems
where it is desirable to permit flow in one direction and prevent flow in the
opposite direction. When the pump starts and the downstream flow creates the
required pressure drop in the forward direction, the Dual Plates will
automatically open. When the pump stops and the flow ceases, the torsion of the
spring will automatically close the Dual Plates prior to flow reversal. This
creates a positive shutoff against flow reversal and eliminates system surges and
wafer check valve drawing
Item No. Part No. Material
1 Body A216 WCB
2 Disc WCB+ENP
3 Stop Pin A276 420
4 Spring Inconnel 625
5 Lifting Eye A29 1025
6 Gasket SS 304
7 Gasket SS304+Graphite
8 Retainer A193 B7
9 Shaft 13 Cr
Our Dual Plate Check Valves are designed for continuous, problem free service and
do not require regularly scheduled maintenance.
Periodic inspections for leakage should be performed. If leakage is present, check
the flange gasket and flange bolttorque. In some situations, it may be necessary
to isolate the Check Valve by shutting off upstream and downstream valves. Then
remove the Check Valve and inspect the seating surfaces for damage. Dual Plate
Check Valves contain Elastomer seats which are vulcanized and bonded to the body
castings.They are not adjustable or replaceable in the field.When removing the
Check Valve for inspection, please follow the removal instructions presented in
this manual. Always relieve pressure from both sides of the Check Valve before
inspection. Vibration Verify that flow rate is within acceptable ranges
Additionally, verify that the Check Valve is 5 to 10 pipe diameters from any
turbulence producing devices Slamming. Remove Check Valve from piping system and
inspect the spring. Verify that the spring is providing the proper tension.
Restricted Flow if flow is halted at the Check Valve, verify that the flow
direction arrow is pointing in the direction of the flow.
To remove the Check Valve from the pipeline, first isolate the Check Valve and
drain the system as much as possible.
Relieve pressure from both sides of the Check Valve by venting the line.
Loosen the outlet flange bolts first then theinlet flange bolts to decompress
gasket seals. Attach required lifting equipment and remove the Check Valve from
SOURCE: Import-Export Bulletin Board (http://www.imexbb.com/)
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