Dual Plate Check Valve Wafer Type -- Technical Datasheet

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1. Product Overview

Parameter	Specification
Product Name	Supreme Valves Dual Plate Wafer Check Valve
Models	H — Wafer (between flanges) · L — Lug (dead-end service) · D — Double flange (12" and up)
Description	Spring-loaded twin-disc check valve per API 594. Compact face-to-face, silent non-slam closure, hermetic shaft support. For pump discharge, pipelines, HVAC, oil & gas, and water systems. Manufactured by Supreme Valves India, Ahmedabad.
Product Page	dual-plate-check-valve.html · Lug type

2. Design Features

Design, end-to-end dimensions, and lug/wafer configuration per API 594
Flange dimensions per ASME B16.5 and ASME B16.47
Inspection and test per API 598
Pressure-temperature ratings per ASME B16.34
Single Inconel X-750 spring: NPS 2–6; double spring: NPS 8 and larger
Lifting lug on NPS 8 and up; stop pin limits disc over-travel
Shaft and stop pin on external support — no through-body holes (hermetic)
NACE MR0175 available; soft or metal seat

3. Ordering Code (Example)

24" H 6 S P F W1 = 24" NPS, wafer (H), Class 600, carbon steel body (S=WCB), metal-to-metal seat (P), plain/serrated face (F), trim W1 (CF8 discs, 410 pin).

Code	Meaning	Code	Meaning
H	Wafer	L	Lug
D	Double flange	1/3/6/9/5/2	Class 150/300/600/900/1500/2500
S	Body WCB	C	Body CF8M
P	Metal seat	E/M/V/N	EPDM / Buna-N / Viton / Neoprene
W1–W6	Trim (disc/pin)	F/R	RF face / RTJ

4. Technical Specifications

Parameter	Specification
Valve Type	Non-Return Valve, Swing Check / Dual Plate / Wafer Check / Silent Nozzle Check
Size Range	DN50 (2") to DN1500 (60") per class availability
Pressure Rating	ASME Class 150, 300, 600, 900, 1500, 2500; PN16/PN40; RF and RTJ
End Connection	Flanged RF per ASME B16.5; Wafer / Lug type (for dual plate/wafer check); Screwed NPT/BSP
Face-to-Face	ASME B16.10 / API 594 (Wafer Check) / BS 2080
Design Standard	API 594 (Dual Plate) / BS 1868 (Swing Check) / BS 5352 (Lift Check) / API 6D
Testing Standard	API 598 / API 6D / ISO 5208 -- Shell Test 1.5 x rating, Seat Test 1.1 x rating
Seat Sealing	Metal-to-Metal with Stellite 6 overlay (hardfaced) / Resilient (EPDM / NBR / Viton / PTFE) soft seat
Closure Action	Automatic self-acting via fluid flow; spring-assisted rapid closure for non-slam/nozzle check

5. Materials of Construction

Part	Standard Material	Exotic/Special Alloys (On Request)
Body	Cast Steel ASTM A216 WCB / SS316 CF8M / Forged Steel A105 / Cast Iron FG 260	Alloy 20, Super Duplex F55, NAB C95800
Disc / Plates	WCB with 13% Cr (Trim 8) / Solid CF8 / CF8M SS316	Solid Duplex, Solid NAB, CF8M with Stellite overlay
Spring (Dual/Nozzle)	Stainless Steel SS316 / Inconel X-750 (high temperature, anti-fatigue)	Inconel 625 spring
Seat Ring	Forged A105/WCB with Stellite 6 hardfacing (min 2mm) / Resilient EPDM/NBR/Viton	Integral SS316 seat, solid Stellite seat ring
Hinge Pin / Stop Pin	Stainless Steel ASTM A276 Type 410 / SS316	Monel K500 stem, SS17-4PH
Bonnet Gasket	Spiral Wound SS304/SS316 with Graphite filler / Flat rubber gasket	Pressure seal metal ring
Bolting	Carbon Steel Studs A193 B7 & Nuts A194 2H	SS316 Studs and Nuts

6. Trim Codes W1–W6

Trim	Discs	Pin / Stop Pin
W1	A351 CF8	A276 Gr. 410
W2	A351 CF8	A276 F304
W3	A351 CF8M	A276 F316
W4	A351 CF3	A276 F304L
W5	A351 CF3M	A276 F316L
W6	A995 CD3MN	A182 F51

7. Soft Seat Temperature Limits

Seat	Operating range
Buna-N	−60°F to 250°F (−51°C to 121°C)
Viton	−10°F to 400°F (−23°C to 204°C)
EPDM	0°F to 300°F (−18°C to 149°C)
Neoprene	0°F to 212°F (−18°C to 100°C)
Metal-to-metal	Per ASME B16.34 for body material

8. Dimensions & Weights — Class 150 (ASME B16.5)

L = face-to-face (mm). D = port bore (mm). Weights in kg (approx.).

NPS	DN	L	D	Wt	Bolts	Stud	L1 RF
2	50	60	51	2	4	5/8"	140
3	80	73	80	4	4	5/8"	160
4	100	73	102	6	8	5/8"	170
6	150	98	152	13	8	3/4"	205
8	200	127	203	25	8	3/4"	240
10	250	146	254	39	12	7/8"	270
12	300	181	305	54	12	7/8"	310
16	400	191	400	117	16	1"	340
20	500	219	500	163	20	1 1/8"	385
24	600	222	600	331	20	1 1/4"	405
36	900	368	874	660	32	1 1/2"	650
48	1200	524	1166	1450	44	1 1/2"	840

9. Dimensions & Weights — Class 300 (ASME B16.5)

NPS	DN	L	D	Wt	Bolts	Stud
2	50	60	51	3	8	5/8"
4	100	73	102	8	8	3/4"
6	150	98	152	18	12	3/4"
8	200	127	203	31	12	7/8"
12	300	181	305	77	16	1 1/8"
16	400	232	400	190	20	1 1/4"
24	600	318	600	410	24	1 1/2"
36	900	483	873	1010	32	1 5/8"

10. Pressure-Temperature — WCB (ASME B16.34)

Maximum allowable non-shock working pressure (psig) by class for ASTM A216 Gr. WCB body.

°F	°C	150	300	600	900	1500	2500
−20 to 100	−29 to 38	285	740	1480	2220	3705	6170
200	93	260	680	1360	2035	3395	5655
400	204	200	635	1265	1900	3170	5280
600	316	140	570	1135	1705	2840	4730
800	427	80	410	825	1235	2055	3430

Note: Prolonged service above 800°F may convert carbide phase; not recommended for extended high-temperature use on WCB without engineering review.

11. Pressure Drop (Water @ 10 ft/s, 60°F)

Indicative ΔP at 3.048 m/s (10 ft/s) water flow — use for line sizing; confirm with vendor calculation for your fluid.

NPS	Flow (GPM)	ΔP (psi)	Head loss (ft)
2	103	4.55	10.5
4	404	2.34	5.4
8	1550	1.21	2.8
12	3500	0.825	1.9
24	15000	0.424	0.98

12. Testing & Inspection

Test	Standard Reference	Acceptance Criteria
Body Hydrostatic Shell	API 598 / API 6D / ISO 5208	1.5 x Rated Pressure (30 bar for 150# WCB), 60s hold, zero visible leakage/deformation
Seat Hydrostatic (Water)	API 598 / API 6D / ISO 5208	1.1 x Rated Pressure (22 bar for 150# WCB), zero seat leakage over test duration
Low Pressure Seat Air	API 598 / EN 12266-1	6 bar air pressure, 60s hold, zero bubbles/leakage
Spring Tension / Travel	Manufacturer Standard	Verify spring-loaded disk return action, travel limits check, zero sticking
PMI & NDT	ASTM E1476 / ASME V	PMI check on SS316/Inconel springs, visual casting inspections

13. Design Standards & Codes

Code/Standard	Description
API 594	Wafer, Wafer-Lug, and Flanged Dualplate Check Valves (standard wafer check code)
BS 1868 / API 6D	Steel Swing Check Valves -- Flanged and Butt-Welding Ends
ASME B16.34	Valves -- Flanged, Threaded, and Welding End (pressure-temperature ratings)
ASME B16.5	Pipe Flanges and Flanged Fittings (dimensional standards)
ASME B16.10	Face-to-Face and End-to-End Dimensions of Valves

14. Documentation & Certification

Deliverable	Details / Status
Material Test Certificates	EN 10204 3.1 Mill Certificates with full chemical & mechanical heat traceability
Pressure Test Reports	Hydrostatic shell and seat test certificates signed by QA/QC inspectors
NDT Reports	Optional RT, MPI, DPT reports for cast body and pins upon request

15. General Notes

Install with flow arrow matching pump discharge direction. Wafer valves require one bolt set through flanges + valve; stud length = flange grip + face-to-face L.
Lug-type (model L) suitable for dead-end removal of downstream flange; wafer (H) requires breaking both flanges.
Dual plate valves close before full flow reversal—reducing water hammer vs swing checks.
Vertical installation (flow up or down) possible on many sizes due to spring assist; confirm with Supreme Valves engineering for NPS > 24.
Class availability by size: e.g. 2500# limited to smaller NPS; confirm on RFQ.

16. Contact & Enquiry

Supreme Enterprise
Industrial Valves & Engineering Solutions
4th Floor, Survey No. 235/A and 247/A, E/401,
Nr. Bhattha School, Gyaspur,
Ahmedabad, Gujarat 382405, India
Branch: Mehta House, Relief Road, Ahmedabad 380001
GST: 24AFAFS5839J1ZQ • IEC: AFAFS5839J

Email: info@supremevalves.in
Phone: +91 97732 78770
Web: www.supremevalves.in

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Frequently Asked Questions

Which standards does the Dual Plate Check Valve Wafer Type comply with?

The Dual Plate Check Valve Wafer Type is designed, manufactured, and tested in accordance with API 594 (Dual Plate) / BS 1868 (Swing Check) / BS 5352 (Lift Check) / API 6D. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.

What materials of construction are available for the Dual Plate Check Valve Wafer Type?

Standard construction is Cast Steel ASTM A216 WCB / SS316 CF8M / Forged Steel A105 / Cast Iron FG 260. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.

What sizes and pressure ratings does the Dual Plate Check Valve Wafer Type cover?

It is offered in DN50 (2") to DN1500 (60") per class availability with ASME Class 150, 300, 600, 900, 1500, 2500; PN16/PN40; RF and RTJ. End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.

Can Supreme Valves supply the Dual Plate Check Valve Wafer Type for export to Saudi Arabia and the Middle East?

Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.

What testing and certification is provided with the Dual Plate Check Valve Wafer Type?

Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.

What is the minimum order quantity and lead time for the Dual Plate Check Valve Wafer Type?

Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.

Dual Plate Check Valve Wafer Type