Standard Dual Plate Check Valve

Design Standard API 594 / API 6D / ASME B16.34 / ISO 5752
Face-to-Face API 594 Short Pattern / ISO 5752 Series 20
Flange Drilling ASME B16.5 / ASME B16.47 / EN 1092-2
Inspection & Test API 598 / ISO 5208 / EN 12266-1
Pressure Rating Class 150 / 300 / 600 / 900 / 1500 / 2500
Size Range 2″ – 60″ (DN50 – DN1500)

Description

Technical Datasheet: Dual Plate Wafer Check Valve

General Information

Item	Standard Configuration	User Specification / Remarks
Valve Type	Dual Plate Wafer Check Valve (Spring Assisted)
Design Standard	API 594 / API 6D / ASME B16.34 / ISO 5752
Face-to-Face	API 594 Short Pattern / ISO 5752 Series 20
Flange Drilling	ASME B16.5 / ASME B16.47 / EN 1092-2
Inspection & Test	API 598 / ISO 5208 / EN 12266-1
Pressure Rating	Class 150 / 300 / 600 / 900 / 1500 / 2500	PN10 / PN16 / PN25 / PN40 also available
Size Range	2″ – 60″ (DN50 – DN1500)
Temperature Range	-46°C to +600°C (Depending on materials)
End Connection	Wafer Type (Fits between flanges)
Installation Position	Horizontal or Vertical Upwards

Design Features

Feature	Description	Benefit
Dual Plate Design	Two spring-loaded plates hinged on a central pivot	Compact, lightweight, quick closing
Spring Assisted Closing	Torsion springs force plates closed when flow stops	Prevents slamming and water hammer
Short Face-to-Face	Very compact body length per API 594	Saves space, reduces installation cost
Non-Slam Operation	Plates close before flow reversal	Eliminates damaging pressure surges
Low Cracking Pressure	Lightweight plates require minimal pressure to open	Suitable for low flow applications
Full Opening	Plates open to 85°-90°	Low pressure drop

Bill of Materials (Standard Material Combinations)

No.	Part Name	Carbon Steel Series	Stainless Steel Series	Ductile Iron Series	Notes
1	Body	WCB / A105	CF8 / CF8M (304/316)	Ductile Iron / GGG50	Epoxy coated
2	Plates / Discs	CF8 / CA15	CF8 / CF8M	Ductile Iron / SS316	Two plates
3	Seat (Metal)	Integral / STL faced	Integral	Integral	For metal seated valves
4	Seat (Soft)	Elastomer / Viton / EPDM / Buna-N	For soft seated valves
5	Springs	Inconel X-750	Inconel X-750	SS304 / Inconel	Corrosion resistant
6	Hinge Pin	SS410	SS316	SS316
7	Bushings / Bearings	SS410 / PTFE	SS316 / PTFE	Bronze / PTFE
8	Stop Pin	SS410	SS316	SS316	Limits plate travel
9	Retainer / Holder	CF8 / CA15	CF8 / CF8M	–	For removable seat designs

Technical Parameters & Performance

Item	Specification
Medium	Water, Seawater, Oil, Gas, Steam, Chemicals, Air
Seat Type	Metal Seat (STL/Alloy) / Soft Seat (Elastomer/PTFE)
Sealing Performance	Zero Leakage (Soft Seat) / API 598 Class V or VI (Metal Seat)
Flow Direction	Unidirectional (Arrow marked on body)
Cracking Pressure	Very low (2-5 psi typical)
Flow Characteristic	Low pressure drop, plates open fully at low velocity
Spring Material	Inconel X-750 (Standard for high temp/corrosion)
Sour Service	NACE MR0175 / ISO 15156 compliant (Optional)

Test Pressure (Reference: Per API 598 / ISO 5208)

Pressure Class	Shell Test (Hydrostatic)	Seat Test (Hydrostatic)	Low Pressure Seat Test (Pneumatic)
Class 150	425 psi (2.9 MPa)	315 psi (2.2 MPa)	80 psi (0.6 MPa)
Class 300	1100 psi (7.6 MPa)	825 psi (5.6 MPa)	80 psi (0.6 MPa)
Class 600	2175 psi (15.0 MPa)	1600 psi (11.0 MPa)	80 psi (0.6 MPa)
PN10	15 bar (1.5 MPa)	11 bar (1.1 MPa)	6 bar (0.6 MPa)
PN16	24 bar (2.4 MPa)	17.6 bar (1.76 MPa)	6 bar (0.6 MPa)

Dimensions & Weight (Reference: API 594 / Class 150 / Wafer Type)

NPS	DN (mm)	L (Face-to-Face) mm	Weight (kg) approx
2″	50	43	1.5
2-1/2″	65	46	2.4
3″	80	64	3.6
4″	100	64	5.7
5″	125	70	7.3
6″	150	76	9.0
8″	200	89	17.0
10″	250	114	26.0
12″	300	114	37-42
14″	350	127	55
16″	400	140	75-78
18″	450	152	101-119
20″	500	152	111-122
24″	600	178	172-174
(Note: Dimensions are for reference only. For higher pressure classes or exact dimensions, refer to certified GA drawing.)

Special Requirements / Options

Seat Type: Metal Seat (STL / Alloy) / Soft Seat (EPDM / Buna-N / Viton / PTFE)
Body Material: WCB / CF8/CF8M / Ductile Iron / LCC / Alloy Steel
Plate Material: CF8/CF8M / Duplex / Aluminum Bronze / Monel
Spring Material: Inconel X-750 (Standard) / SS316 / Hastelloy
NACE Compliance: MR0175 / ISO 15156 (Sour Service)
Test Certificate: EN 10204 Type 3.1 / 3.2
Coating: Epoxy coating (Min. 250 microns) / No coating / Special paint
Special Cleaning: For Oxygen / Food / Pharmaceutical service
Lifting Lug: Yes / No (For larger sizes)
Vertical Down Installation: Consult manufacturer

Design Notes:

Dual Plate Check Valves are also known as double disc check valves, split disc check valves, or butterfly check valves .
They are 80-90% lighter than traditional swing check valves .
Retainer-less design options available to eliminate fugitive emissions .
Suitable for pulsating flow conditions due to quick response of spring-assisted plates.

Note: This datasheet is prepared for a Dual Plate Wafer Check Valve per API 594 / API 598. Ensure selected materials, seat type, and pressure class are compatible with the specific service conditions (medium, temperature, pressure, and environmental requirements).

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.

HOT SALE PRODUCTS

For over 10 years, we have been a leading supplier of industrial valves for major global projects in water supply, oil & gas, and desalination.

News