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Dual Plate Lug Type Check Valve,600LB,4 Inch,WCB Body,316 Trim,Lug Type End

Categories Wafer Check Valve
Brand Name: STV
Model Number: LH76H
Certification: ISO9001
Place of Origin: China
MOQ: 10pcs
Price: 200usd/pcs
Supply Ability: 1000pc/month
Delivery Time: 25 working days
Packaging Details: export standard packing
Material: WCB
Flanged End: RF
Size: 4"
Pressure: 600LB
Design: API594
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Dual Plate Lug Type Check Valve,600LB,4 Inch,WCB Body,316 Trim,Lug Type End

ServiceOil, Natural gas, Water and Chemical Transmission Pipeline application
Design TypeDual plate/ Single plate
EndsWafer type, Flange ends, Lug type
Size2”-36”
Design pressure150Lb-2500Lb
Design temperature-46-600℃
Main materialsCS/SS/Duplex stainless steel/Bronze/Inconel/Titanium alloy steel
Seat sealing type13Cr /Stellite
OperationNot applicable
Design StandardAPI594
Face to faceAPI594
EndsRF/RTJ to ASME B16.5/ASME B16.47
Pressure and Temperature DesignASME B16.34
Test standardAPI598
Fire safeAPIF6A
OthersNACE MR0175/ISO15156(if applicable

Dual Plate Lug Type Check Valve

We have been specializing in Valves for many years. Our main products include Wafer Check Valve, Spring Check Valve, Dual Plate Valve and check valve.


Retainer Type ( C Type )
No.Parts NameQ'tyRemarks
1Body1
2Plate2
3Seat1
4Spring21-1/2"(40A) to 22"(550A)
424"(600A) & Larger size
5Hinge Pin1
6Stop Pin1
7Body Bearing2
8Plate Bearing2
9Spring Bearing31-1/2"(40A) to 22"(550A)
524"(600A) & Larger size
10Stabilizer4For Rubber Seat Valve only
11Retainer4
12Eye Bolt1/28"(200A) & Larger size
13Sleeve224"(600A) & Larger size
Retainer Type ( G Type )
No.Parts NameQ'tyRemarks
1Body1
2Plate2
3Seat1
4Spring21-1/2"(40A) to 22"(550A)
424"(600A) & Larger size
5Hinge Pin1
6Stop Pin1
7Body Bearing2
8Plate Bearing2
9Spring Bearing31-1/2"(40A) to 22"(550A)
524"(600A) & Larger size
10Adjust Plate2
11Spring Washer2
12Fix Ring1
13Sleeve224"(600A) & Larger size
14Eye Bolt1/28"(200A) & Larger size

Installation
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.
1)Horizontal Installation

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.
2)Vertical Installation
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.

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 bolts.
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.
Operation
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 water hammer.

NPSin221/23456810121416182024
150LbLmm606773738698127146181184191203219222
Dmm103122135173196222279339409450514549606717
D1mm120.5139.5152.5190.5216241.5298.5362432476540578635749.5
D2mm92105127157186216270324381413470533584692
n-Фdmm4-194-194-198-198-228-228-2212-2512-2512-2916-2916-3220-3220-35
300LbLmm606773738698127146181222232
Dmm110128148180215250307361422485539
D1mm127149168.5200235270330387.5451514.5571.5
D2mm92105127157186216270324381413470
n-Фdmm8-198-228-228-228-2212-2212-2516-2916-3220-3220-35
600LbLmm60677379105137165213229273305
Dmm110129148192240265319399456489562
D1mm127149168.5216267292349432489527603
D2mm92105127157186216270324381413470
n-Фdmm8-198-228-228-258-2912-2912-3216-3520-3520-3820-41

Maintenance
Our Dual Plate Check Valves are designed for continuous, problem free service and do not require regularly scheduled maintenance.

Leakage
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.
Valve Removal
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 the pipeline.
Quality Dual Plate Lug Type Check Valve,600LB,4 Inch,WCB Body,316 Trim,Lug Type End wholesale
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