PRODUCT FEATURES
H74 Check Valve — Product Features
Widely used in water treatment, chemical, food & beverage, HVAC, petroleum and general industrial piping systems to prevent backflow.
Custom Seal & Pressure Class
We support custom seal material and pressure class.
EN10204 3.1 Certificate
Material test certificate EN10204 3.1 is available.
Hydrostatic Pressure Test
Each valve will undergo hydrostatic pressure test before shipment.
OPERATING PRINCIPLE
How H74 Check Valve Works
-
1. Ultra-Thin Wafer Design
Ultra-thin wafer-style design; lightweight with a very short face-to-face dimension, saving installation space.
-
2. Single-Disc Swing Design
Single-disc swing-type design, offering low flow resistance and rapid response to changes in flow rate.
-
3. PTFE / EPDM Soft Seal
Available with optional PTFE or EPDM soft-sealing rings, ensuring excellent sealing performance and effective leakage prevention.
-
4. Stainless Steel Construction
Valve body and disc are constructed from stainless steel, providing superior corrosion resistance against water, gases, oils, and mildly corrosive media.
-
5. Simple Structure
Simple structure, easy to install and maintain; suitable for horizontal pipelines.
-
6. Wide Pressure Range
Wide range of pressure ratings: available in various specifications, including PN10, PN16, PN25, and PN40.
ENGINEERING DATA
Technical Specifications
Technical data supplied for H74 Check Valve. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| Type | H74 Check Valve |
| Material | 304/316L stainless steel |
| Nominal diameter | 1”–12” (DN25–DN300) |
| Rated pressure | PN10-PN40 |
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 |
| DN250 | 29 | 192 | 330 |
| DN300 | 38 | 216 | 380 |
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 / CF83 |
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 Single Disc Swing Check Valve?
It is a wafer-type non-return valve with one swing disc, installed between two pipe flanges. It allows fluid to flow in one direction and automatically closes to prevent backflow when flow reverses. This is the single flap type (H74 series).
What’s the difference between single disc swing wafer check valve and dual disc check valve?
Single disc has one large swing flap, larger flow passage, lower flow resistance, good for large diameter pipelines. Dual disc has two small half-moon discs, thinner body, normally spring assisted. Our single disc model is without spring.
What materials are available?
Standard body & disc: CF8 (304), CF8M (316L). Seal options: FKM/Viton (the green seal on picture), EPDM, PTFE for soft seal (H74X); metal hard seal for high temp (H74W).
What materials can you provide?
- 304 / 316L stainless steel (corrosion-resistant; suitable for water, gases, chemical media, and instrumentation piping).
What are the suitable applications?
Water supply, compressed air, natural gas, fire protection, HVAC (heating, ventilation, and air conditioning), instrumentation piping, petroleum, low-to-medium pressure industrial piping, and water supply/drainage systems.
Can you provide an MTC (Material Test Certificate)?
Yes. We can provide an MTC compliant with the EN10204 3.1 standard, which includes the heat number. If an EN10204 3.2 third-party certified MTC is required, it can be arranged at the buyer’s request (subject to an additional fee).
What surface treatment options are available?
The standard treatment is a pickled matte finish.
Is laser marking available?
Yes. We can laser-mark the flat surfaces of the valve body with details such as size, material grade, heat number, and the customer’s logo or brand name.
How are the products packed for ocean freight?
For externally threaded ends, plastic thread protectors are applied. The products are packed into export-grade cartons, placed on fumigated wooden pallets, and wrapped in waterproof stretch film to prevent surface scratches or damage to the threads.
What is the lead time for delivery?
Typically, orders can be shipped within 7 to 15 days after receipt of the deposit, depending on the order quantity.
How is quality control managed?
Raw material inspection → CNC machining → thread inspection → hydrostatic testing → visual inspection → final dimensional check before packaging.
Which Incoterms are offered to overseas buyers?
We offer FOB (Free On Board) terms, with 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 to buyers?
We offer FOB (Free On Board) or CIF (Cost, Insurance, and Freight) terms, with shipment 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 defects or non-conformities in the threads are discovered upon arrival?
Please provide photos, videos, and inspection records. We will assess the root cause of the issue; in accordance with the contract terms, solutions may include product replacement, a partial refund, or a new shipment.
H74 Check Valve
H74W Wafer Single Disc Swing Check Valve, CF8/CF8M stainless steel, soft seal with PTFE/EPDM. Thin wafer clamped design, low flow resistance, one-way non return valve for industrial, water and chemical pipelines. Sizes DN25-DN300, PN10~PN40 optional, MTC certificate available.
Type: H74 Check Valve
Material: 304/316L stainless steel
Nominal diameter: 1”–12” (DN25–DN300)
Rated pressure: PN10-PN40
