• Short connection length and easy installation.
• Corrosion-resistant, lightweight, and cost-effective.
• The fully open angle of UPVC and CPVC single-piece clamp check valves is about 40°.
• Due to the small inner diameter of PPH flanges, to achieve a larger opening angle, it is necessary to chamfer the flange or add a connecting plate between the flange and the valve.
| No. | Parts | Materials |
|---|---|---|
| 1 | Rings | Stainless Steel |
| 2 | Screw | UPVC, CPVC, PPH, PVDF |
| 3 | Body | UPVC, CPVC, PPH, PVDF |
| 4 | Disc | UPVC, CPVC, PPH, PVDF |
| 5 | Inner O-ring | EPDM, FPM |
| 6 | Outside O-ring | EPDM, FPM |
| DN | d | D1 | P | L | Working Pressure (MPa) | Minimum Back Pressure (MPa) |
|---|---|---|---|---|---|---|
| DN40 | 23 | 82 | 36 | 18 | 1.0 | 0.05 |
| DN50 | 27 | 108 | 44 | 21 | 1.0 | 0.05 |
| DN65 | 40 | 127 | 58 | 22 | 1.0 | 0.05 |
| DN80 | 54 | 142 | 70 | 23 | 1.0 | 0.05 |
| DN100 | 70 | 165 | 89 | 25 | 1.0 | 0.05 |
| DN125 | 92 | 192 | 115 | 28 | 1.0 | 0.05 |
| DN150 | 112 | 217 | 131 | 30 | 1.0 | 0.05 |
| DN200 | 150 | 270 | 179 | 34 | 0.6 | 0.05 |
| DN250 | 190 | 328 | 230 | 39 | 0.6 | 0.05 |
| DN300 | 216 | 378 | 260 | 44 | 0.6 | 0.05 |
• Design and manufacturing comply with Chinese national standards and API (American Petroleum Institute) standards.
• Basic structural form: single-disc swing type (ultra-thin design).
• Nominal pressure: PN0.6–2.5 MPa, ANSI 150–300 lb.
• Nominal diameter: DN50–500 mm (NPS 2–20).
• Basic model: H74F–10S.
• Main materials are listed in Table A16.
| Materials | Medium Temperature (°C) |
|---|---|
| RPP (Reinforced Polypropylene) | -14°C ~ +90°C |
| PVDF (Polyvinylidene Fluoride) | -40°C ~ +140°C |
| PPH (Homopolypropylene) | -14°C ~ +95°C |
| UPVC (Unplasticized Polyvinyl Chloride) | -14°C ~ +80°C |
| CPVC (Chlorinated Polyvinyl Chloride) | -20°C ~ +95°C |
| Design | Face to Face | End Flange | Pressure Test | Symbol | Supply |
|---|---|---|---|---|---|
| GB12240 / API 6D | GB/T15188.2, API 6D (Short Series) | JB78 / JB79, ANSI B16.5 | API 598 / GB/T13927 | MSS SP-25 / GB12220 | ANSI B16.34 / GB/T12252 |
| DN (mm) | PN0.6 MPa (L) | PN0.6 MPa (D) | PN1.0 MPa (L) | PN1.0 MPa (D) | PN1.6 MPa / Class150 (L) | PN1.6 MPa / Class150 (D) | PN2.5 MPa / Class300 (L) | PN2.5 MPa / Class300 (D) |
|---|---|---|---|---|---|---|---|---|
| 50 | 19 | 90 | 19 | 100 | 19 | 100 / 92 | 19 | 100 / 92 |
| 65 | 19 | 110 | 19 | 120 | 19 | 120 / 105 | 19 | 120 / 105 |
| 80 | 19 | 125 | 19 | 135 | 19 | 135 / 127 | 19 | 135 / 127 |
| 100 | 19 | 145 | 19 | 155 | 19 | 155 / 157 | 19 | 160 / 157 |
| 150 | 19 | 200 | 19 | 210 | 19 | 210 / 216 | 22 | 218 / 216 |
| 200 | 28 | 255 | 28 | 265 | 28 | 265 / 270 | 28 | 278 / 270 |
| 250 | 28 | 310 | 28 | 320 | 28 | 320 / 324 | 38 | 332 / 324 |
| 300 | 38 | 362 | 38 | 368 | 38 | 375 / 381 | 51 | 390 / 381 |
| 350 | 44 | 412 | 44 | 428 | 44 | 435 / 413 | 51 | 448 / 413 |
| 400 | 51 | 462 | 51 | 482 | 51 | 485 / 470 | 51 | 505 / 470 |
| 450 | 60 | 518 | 60 | 532 | 60 | 545 / 533 | 76 | 555 / 533 |
| 500 | 60 / 64 | 568 | 60 / 64 | 585 | 60 / 64 | 608 / 584 | 83 | 610 / 584 |
Step 1: Order and Design
Based on the operating conditions provided by the customer (pressure, temperature, medium type, connection standards, etc.), determine the dimensions, materials (e.g., PP, PVC, PVDF), and configuration (single-disc/double-disc) of the wafer check valve. Complete the drawing design and technical review to ensure compliance with relevant standards (e.g., ANSI, DIN).
Step 2: Raw Material Preparation & Molding
Select suitable plastic raw materials and perform drying treatment. Mold the main components of the wafer check valve, such as the valve body and disc, using injection molding or compression molding processes. Control temperature and pressure parameters to ensure dimensional accuracy and stable material properties.
Step 3: Machining
Perform necessary machining on the molded wafer check valve components, such as finishing sealing surfaces, reaming holes, and deburring edges, to ensure assembly precision and sealing performance.
Step 4: Assembly
Assemble the valve body, valve disc, spring (if applicable), and seals into a complete wafer check valve according to the assembly process. During this process, check that all components fit smoothly to ensure flexible opening and closing.
Step 5: Testing & Quality Assurance
The wafer check valve undergoes leak testing, opening/closing performance testing, and pressure testing to ensure there are no leaks and that it meets design requirements. Concurrently, visual and dimensional inspections are conducted to guarantee product consistency and reliability.
Step 6: Finishing, Packaging and Shipment
The product is cleaned and marked as necessary (e.g., specifications, batch number), and protective packaging is used to prevent damage during transport. The product is packed according to order specifications and shipped.
Check valves are used in piping systems, primarily to prevent backflow of the medium, prevent pumps and their drive motors from reversing, and prevent the discharge of the medium from vessels. Check valves can also be used in supply lines for auxiliary systems where the internal pressure may rise above that of the main system. Depending on the material used, check valves can be suitable for pipelines carrying various types of media. When installed in a pipeline, a check valve becomes an integral fluid component of that system, and the opening and closing of its disc are influenced by the transient flow conditions of the system; conversely, the closing characteristics of the disc also affect the flow conditions of the fluid.
These valves are widely used in:
Oil and Gas
Chemical Processing
Power Plants
Water Treatment
Metallurgy and Mining
Agriculture and Irrigation
Superior Quality
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