PRODUCT FEATURES
H71 Check Valve — Product Features
Widely used in chemical processing, water treatment, food and beverage, power generation, the petroleum industry, HVAC systems, and various other industrial piping applications, these valves are designed to protect pumps and equipment from damage caused by backflow.
Custom Sizes & Materials
Customization of sizes and materials is available (options include CF8/304 stainless steel and CF8M/316 stainless steel).
EN10204 3.1 Certificates
All valves can be supplied with EN10204 3.1 test certificates.
Pressure Tested
Every unit undergoes rigorous pressure testing before leaving the factory.
OPERATING PRINCIPLE
How H71 Check Valve Works
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1. Compact Wafer Design
Compact wafer-style design with a short face-to-face dimension, saving installation space and facilitating easy installation between flanges.
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2. Spring-Loaded Closing
Spring-loaded closing mechanism; suitable for both horizontal and vertical installation, providing rapid response and effectively preventing backflow of the medium.
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3. CF8M / CF8 Construction
Constructed from CF8M (316 stainless steel) or CF8 (304 stainless steel); the 316 grade offers excellent corrosion resistance, making it suitable for water, oil, gas, and mildly acidic or alkaline media.
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4. Hard-Sealing Design
Hard-sealing design ensures stable sealing performance; rated for pressures of PN16, PN25, and PN40.
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5. Low Resistance, Long Life
Features low flow resistance, reliable operation, and a long service life.
ENGINEERING DATA
Technical Specifications
Technical data supplied for H71 Check Valve. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| Model | H71W |
| Nominal Pressure | PN16/PN25/PN40 |
| Body Material | CF8 (304 stainless steel) / CF8M (316 stainless steel) |
| Size Range | DN15 – DN200 |
| Connection Type | Wafer-style (clamped between flanges) |
| Sealing Type | Metal-to-metal (hard) seal |
| Applicable Media | Water, steam, oil, and mildly corrosive chemical fluids |
| Operating Temperature | -20°C to +250°C |
MECHANICAL DIMENSIONS
Dimensions.
Overall dimensions by nominal size, from the supplied dimension chart.
Dimension chart
| SIZE | H | D1 | D2 |
|---|---|---|---|
| DN25 | 15 | 11 | 72 |
| DN32 | 15 | 18 | 83 |
| DN40 | 15 | 22 | 90 |
| DN50 | 15 | 25 | 104 |
| DN65 | 16 | 42 | 125 |
| DN80 | 16 | 52 | 140 |
| DN100 | 18 | 70 | 160 |
| DN125 | 18 | 96 | 190 |
| DN150 | 20 | 115 | 218 |
| DN200 | 26 | 138 | 270 |
COMPONENT BREAKDOWN
Parts & Materials
Component names and materials from the supplied product parts list.
| NO. | PART | MATERIAL |
|---|---|---|
| 01 | Body | CF8 / CF8M |
| 02 | Valve Plate | CF8 / CF8M |
| 03 | Spring | 304 / 316 |
| 04 | Gasket | PTFE |
| 05 | Bonnet | CF8 |
APPLICATIONS
Applications
Applicable media: the supplied document lists the following fluids. Actual compatibility depends on selected materials, concentration, temperature, pressure and the specific service conditions.
Application – Water Circulation
Cooling water, circulating water, drinking water and neutral purified water.
Application – Steam Piping
Clean, low-temperature saturated steam, subject to the product’s confirmed temperature and pressure limits.
Application – Compressed Air
Compressed air and nitrogen; verify compatibility for each system.
PURCHASING SUPPORT
Frequently Asked Questions
Find answers to common questions about materials, certification, packing and delivery.
What is a Wafer Check Valve?
It is a spring-loaded wafer type lift check valve, also called silent check valve. It is installed between two flanges, used to prevent reverse flow of medium in pipeline. It opens with forward fluid pressure and closes quickly by spring force once flow reverses.
What does H71W-PN40 DN80 CF8M mean?
- H71W: Model code, hard-seal wafer lift check valve
- PN40: Nominal pressure 40 Bar
- DN80: Nominal size DN80 (3 inch)
- CF8M: Cast stainless steel 316 material
What materials do you supply?
Standard options: CF8 (304 stainless steel), CF8M (316 stainless steel). Spring is SS316. Custom material like duplex stainless steel is available on request.
What materials can you supply?
- Stainless steel 304 / 316L (corrosion resistant, water, gas, chemical, instrument piping)
What applications?
Water supply, compressed air, natural gas, fire protection, HVAC, instrument piping, oil, low & medium pressure industrial pipeline, plumbing systems.
Can you provide MTC material certificate?
Yes, EN10204 3.1 MTC with heat number is available. EN10204 3.2 third-party certificate can be arranged at buyer’s extra cost.
Surface finish options?
Standard: pickled matte finish.
Can you do laser marking?
Yes. We can mark size, grade, heat number, customer logo or brand on the flats.
Packaging for sea shipment?
Male threads are protected by plastic thread caps. Packed into export cartons, then loaded on fumigated wooden pallets with waterproof stretch film to avoid scratch and thread damage.
What is the lead time?
Typically, shipments are dispatched within 7–15 days of receiving the deposit, depending on the order quantity.
How is quality controlled?
Raw material inspection → CNC machining → Thread inspection → Hydrostatic testing → Visual inspection → Final dimensional verification before packaging.
Which Incoterms are available for overseas buyers?
We offer FOB (Free On Board) terms, with the shipment originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for import customs clearance.
Which Incoterms are available for buyers?
We offer FOB (Free On Board) or CIF (Cost, Insurance, and Freight) terms, with shipments originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for customs clearance.
What should be done if the threads are found to be defective or do not meet requirements upon arrival?
Please provide photos, videos, and inspection records. We will assess the root cause; depending on the contractual terms, solutions may include product replacement, a partial refund, or a reshipment.
H71 Check Valve
The H71W wafer-type check valve is available in CF8 (304 stainless steel) or CF8M (316L stainless steel) and is designed for nominal pressures of PN16, PN25, and PN40. It features a spring-loaded mechanism and a wafer-style connection. The valve utilizes a metal-to-metal hard seal, offers excellent corrosion resistance, and is suitable for use in chemical processing, water treatment, steam systems, and various other industrial pipelines, effectively preventing the backflow of media. Available in sizes ranging from DN15 to DN200; a material test certificate can be provided upon request.
Type: H71 Check Valve
Material: 304/316L stainless steel
Nominal diameter: 1/2”–8” (D15–DN200)
Rated pressure: PN16/PN25/PN40
