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Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB

STV Valve Technology Group Co.,Ltd

Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB

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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 : CF8M

Flanged End : Wafer

Size : 20"

Pressure : 150LB

Design : API594

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Service Oil, Natural gas, Water and Chemical Transmission Pipeline application
Design Type Dual plate/ Single plate
Ends Wafer type, Flange ends, Lug type
Size 2”-36”
Design pressure 150Lb-2500Lb
Design temperature -46-600℃
Main materials CS/SS/Duplex stainless steel/Bronze/Inconel/Titanium alloy steel
Seat sealing type 13Cr /Stellite
Operation Not applicable
Design Standard API594
Face to face API594
Ends RF/RTJ to ASME B16.5/ASME B16.47
Pressure and Temperature Design ASME B16.34
Test standard API598
Fire safe APIF6A
Others NACE 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.

Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB
Retainer Type ( C Type )
No. Parts Name Q'ty Remarks
1 Body 1
2 Plate 2
3 Seat 1
4 Spring 2 1-1/2"(40A) to 22"(550A)
4 24"(600A) & Larger size
5 Hinge Pin 1
6 Stop Pin 1
7 Body Bearing 2
8 Plate Bearing 2
9 Spring Bearing 3 1-1/2"(40A) to 22"(550A)
5 24"(600A) & Larger size
10 Stabilizer 4 For Rubber Seat Valve only
11 Retainer 4
12 Eye Bolt 1/2 8"(200A) & Larger size
13 Sleeve 2 24"(600A) & Larger size
Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB
Retainer Type ( G Type )
No. Parts Name Q'ty Remarks
1 Body 1
2 Plate 2
3 Seat 1
4 Spring 2 1-1/2"(40A) to 22"(550A)
4 24"(600A) & Larger size
5 Hinge Pin 1
6 Stop Pin 1
7 Body Bearing 2
8 Plate Bearing 2
9 Spring Bearing 3 1-1/2"(40A) to 22"(550A)
5 24"(600A) & Larger size
10 Adjust Plate 2
11 Spring Washer 2
12 Fix Ring 1
13 Sleeve 2 24"(600A) & Larger size
14 Eye Bolt 1/2 8"(200A) & Larger size

Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB

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.
Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB

NPS in 2 21/2 3 4 5 6 8 10 12 14 16 18 20 24
150Lb L mm 60 67 73 73 86 98 127 146 181 184 191 203 219 222
D mm 103 122 135 173 196 222 279 339 409 450 514 549 606 717
D1 mm 120.5 139.5 152.5 190.5 216 241.5 298.5 362 432 476 540 578 635 749.5
D2 mm 92 105 127 157 186 216 270 324 381 413 470 533 584 692
n-Фd mm 4-19 4-19 4-19 8-19 8-22 8-22 8-22 12-25 12-25 12-29 16-29 16-32 20-32 20-35
300Lb L mm 60 67 73 73 86 98 127 146 181 222 232
D mm 110 128 148 180 215 250 307 361 422 485 539
D1 mm 127 149 168.5 200 235 270 330 387.5 451 514.5 571.5
D2 mm 92 105 127 157 186 216 270 324 381 413 470
n-Фd mm 8-19 8-22 8-22 8-22 8-22 12-22 12-25 16-29 16-32 20-32 20-35
600Lb L mm 60 67 73 79 105 137 165 213 229 273 305
D mm 110 129 148 192 240 265 319 399 456 489 562
D1 mm 127 149 168.5 216 267 292 349 432 489 527 603
D2 mm 92 105 127 157 186 216 270 324 381 413 470
n-Фd mm 8-19 8-22 8-22 8-25 8-29 12-29 12-32 16-35 20-35 20-38 20-41

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.
Dual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LBDual Plate Full Lug Type Check Valves ,Metal Seat ,CF8M Body,DN500,150LB

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