Swing check valve · Chinese standard · Made in Wenzhou
GB/T 12236 Swing Check Valve — PN16 to PN40, DN15 to DN300
Flanged swing check valve that opens with forward flow and closes on reverse flow, to protect pumps and lines from backflow. PN16, PN25 and PN40, DN15 to DN300, in WCB, CF8 or CF3M, for water, oil products and steam.
- Bodies cast in our own foundry, traceable to the heat number
- Every valve shell and seat tested per GB/T 13927, test report in every shipment
- Standard sizes ship in 15–20 days
An engineer replies within 24 hours. Send size, PN, material and quantity. Download GA drawing (PDF) →
Specifications
Technical Data
| Design standard | GB/T 12224 · GB/T 12236 |
| Face-to-face | GB/T 12221 |
| Flanges | HG/T 20592, raised face |
| Size range | DN15–DN300 |
| Pressure rating | PN16 / PN25 / PN40 |
| Body material | WCB (A216) · CF8 (A351) · CF3M (A351) |
| Type | Swing disc on a hinge arm, bolted cover |
| Seating | Hard seal, metal-to-metal; disc and seat faces hard-faced with iron-based alloy or Stellite (cobalt-based) to order; 316L body seat on the CF3M valve |
| Cover gasket | 304 + flexible graphite |
| Temperature | −29 °C to +550 °C depending on body material and trim (the CF3M H44W-16 drawing is rated to +150 °C) |
| Media | Corrosive media, water, oil and gas |
| Testing | GB/T 13927 — every valve |
Application
Where It Is Used
For horizontal lines, or vertical lines with upward flow, where reverse flow must be stopped automatically.
- Pump and compressor discharge lines
- Chemical lines with corrosive media (CF3M body)
- Water supply and treatment
- Projects and plants designed to GB / HG standards
ASSEMBLY HALL · WENZHOUConstruction
Parts & Materials
From our H44W-16 general assembly drawing (CF3M body). WCB and CF8 versions are built the same way with matching trim; we confirm the bill of materials with your quotation.
| Part | Material (CF3M valve) |
|---|---|
| Body | A351 CF3M |
| Body seat | 316L |
| Disc | A351 CF3M |
| Hinge arm | A351 CF3M |
| Hinge pin | 304 |
| Cover | A351 CF8 |
| Cover gasket | 304 + flexible graphite |
| Studs / nuts | 304 |
| Lifting eye | 304 |
Features
- Materials selected to Chinese and international standards
- Disc and seat sealing faces hard-faced with iron-based alloy or Stellite cobalt alloy: wear-, heat- and corrosion-resistant, long service life
- Flanges and flange facings to the standard your project uses
- Wide choice of body materials and gaskets matched to pressure, temperature and media
Dimensions
Dimensions (mm)
Face-to-face to GB/T 12221, flanges to HG/T 20592. Unit: mm.
PN16, DN50–DN300
| DN | L | D | D1 | D2 | b-f | Z-Ød | H |
|---|---|---|---|---|---|---|---|
| DN50 | 230 | 160 | 125 | 100 | 14-2 | 4-Ø18 | 135 |
| DN65 | — | 180 | 145 | 120 | 14-2 | 4-Ø18 | 142 |
| DN80 | 310 | 195 | 160 | 135 | 16-2 | 8-Ø18 | 165 |
| DN100 | 350 | 215 | 180 | 155 | 16-3 | 8-Ø18 | 180 |
| DN125 | 400 | 245 | 210 | 185 | 16-3 | 8-Ø18 | 210 |
| DN150 | 480 | 280 | 240 | 210 | 18-3 | 8-Ø23 | 233 |
| DN200 | 500 | 335 | 295 | 265 | 20-3 | 12-Ø23 | 304 |
| DN250 | 550 | 405 | 355 | 320 | 20-3 | 12-Ø25 | 348 |
| DN300 | 650 | 460 | 410 | 375 | 22-3 | 12-Ø25 | 390 |
PN25, DN20–DN300
| DN | L | D | D1 | D2 | b-f | Z-Ød | H |
|---|---|---|---|---|---|---|---|
| DN20 | 150 | 105 | 75 | 55 | 16-2 | 4-Ø14 | 100 |
| DN25 | 160 | 115 | 85 | 65 | 16-2 | 4-Ø14 | 100 |
| DN32 | 180 | 135 | 100 | 78 | 18-2 | 4-Ø18 | 105 |
| DN40 | 200 | 145 | 110 | 85 | 18-3 | 4-Ø18 | 115 |
| DN50 | 230 | 160 | 125 | 100 | 20-3 | 4-Ø18 | 135 |
| DN65 | 290 | 180 | 145 | 120 | 22-3 | 8-Ø18 | 140 |
| DN80 | 310 | 195 | 160 | 135 | 22-3 | 8-Ø18 | 145 |
| DN100 | 350 | 230 | 190 | 160 | 24-3 | 8-Ø23 | 165 |
| DN125 | 400 | 270 | 220 | 188 | 28-3 | 8-Ø25 | 250 |
| DN150 | 480 | 300 | 250 | 218 | 30-3 | 8-Ø25 | 295 |
| DN200 | 550 | 360 | 310 | 278 | 34-3 | 12-Ø25 | 315 |
| DN250 | 650 | 425 | 370 | 332 | 36-3 | 12-Ø30 | 430 |
| DN300 | 750 | 485 | 430 | 390 | 40-4 | 16-Ø30 | 480 |
PN40, DN20–DN300
| DN | L | D | D1 | D2 | D6 | b-f | Z-Ød | H |
|---|---|---|---|---|---|---|---|---|
| DN20 | 150 | 105 | 75 | 55 | 51 | 16-2 | 4-Ø14 | 100 |
| DN25 | 160 | 115 | 85 | 65 | 58 | 16-2 | 4-Ø14 | 100 |
| DN32 | 180 | 135 | 100 | 78 | 66 | 18-2 | 4-Ø18 | 105 |
| DN40 | 200 | 145 | 110 | 85 | 76 | 18-3 | 4-Ø18 | 115 |
| DN50 | 230 | 160 | 125 | 100 | 88 | 20-3 | 4-Ø18 | 135 |
| DN65 | 290 | 180 | 145 | 120 | 110 | 22-3 | 8-Ø18 | 140 |
| DN80 | 310 | 195 | 160 | 135 | 121 | 22-3 | 8-Ø18 | 145 |
| DN100 | 350 | 230 | 190 | 160 | 150 | 24-3 | 8-Ø23 | 165 |
| DN125 | 400 | 270 | 220 | 188 | 176 | 28-3 | 8-Ø25 | 250 |
| DN150 | 480 | 300 | 250 | 218 | 204 | 30-3 | 8-Ø25 | 295 |
| DN200 | 550 | 375 | 320 | 282 | 260 | 38-3 | 12-Ø30 | 315 |
| DN250 | 650 | 445 | 385 | 345 | 313 | 42-3 | 12-Ø34 | 430 |
| DN300 | 750 | 510 | 450 | 408 | 364 | 46-4 | 16-Ø34 | 480 |
— = not yet confirmed; sent with your quotation. L face-to-face · D flange outside diameter · D1 bolt circle diameter · D2 raised face diameter · D6 recessed-face diameter · b-f flange thickness and raised face height · Z-Ød number and diameter of bolt holes · H height. DN15 to the H44W-16 drawing below.
CHECK VALVE BODIESChecked before packing
Face-to-face and flange dimensions are checked against the drawing before packing. Each valve gets a QC tag with model, size, rating and inspector.
Pressure rating
Pressure Rating
| Rating | Nominal pressure (MPa) |
|---|---|
| PN16 | 1.6 |
| PN25 | 2.5 |
| PN40 | 4.0 |
Nominal pressure at room temperature. The allowed pressure falls as the temperature rises; the temperature limit depends on body material and trim.
Testing
Pressure Test on Every Valve
| Test | Pressure |
|---|---|
| Shell test (water), PN16 | 2.4 MPa (1.5 × PN) |
| Seat test (water), PN16 | 1.76 MPa (1.1 × PN) |
| Shell / seat test, PN25 and PN40 | 1.5 × PN / 1.1 × PN |
Tested per GB/T 13927. Actual values for each valve are on the test report.
HYDRAULIC TEST BENCH
SHELL & SEAT TESTQuality records
A Product Test Report in Every Shipment
- Heat number of the body casting
- Chemical composition against ASTM limits
- Mechanical properties: tensile, yield, elongation
- Shell and seat test pressure and hold time
- Signed and stamped by our QC department
We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer; inspectors get full access to our plant and test bench.
Download Sample EN 10204 3.1 Report (PDF)How to order
Model Code H44W-16
A material letter is added for the body, e.g. H44W-16P (CF8) or H44W-16RL (CF3M). We confirm the full code on the order confirmation.
Send us these 7 details for a fast quote
- Size (DN15–DN300)
- Pressure rating (PN16 / 25 / 40)
- Body material (WCB / CF8 / CF3M)
- Media, temperature and flow direction
- Quantity
- Marking or nameplate needs
- Destination port
Made by BAUTU
From Casting to Crate
01 CASTING
02 MACHINING03 ASSEMBLY
04 PRESSURE TEST
FINISHED VALVESSee the valve before you order
Want to see your own order before it ships? Book a live video call and we show your valves on the test bench.
Book a Video Tour
BAGGED & CAPPEDPacking & delivery
Packed for Sea Freight
- Flange faces capped to protect the sealing face
- Each valve bagged; the order packed in plywood cases
- Product test report inside every case
- Standard sizes ship in 15–20 days
FAQ
Frequently Asked Questions
How should a swing check valve be installed?
In horizontal pipe, or in vertical pipe with the flow going upward, with the arrow on the body pointing in the flow direction. It should not be installed in vertical pipe with downward flow.
What pressure and temperature can it handle?
PN16, PN25 and PN40 (1.6 to 4.0 MPa), from −29 °C up to +550 °C depending on body material and trim. Typical service is water, oil products and steam in oil, chemical and power plants. Tell us the media and temperature and we confirm the material and seat facing.
Why choose a swing check valve?
The disc swings fully out of the flow path, so the pressure drop is low. It suits pump discharge lines and larger sizes where a lift check valve would restrict the flow.
Which body material should I choose: WCB, CF8 or CF3M?
WCB carbon steel for non-corrosive water, oil, gas and steam. CF8 (cast 304) for general corrosion resistance. CF3M (cast 316L) for chlorides, seawater and chemical media.
What documents ship with the valve?
A product test report with the heat number of the body casting, chemical composition, mechanical properties and the pressure test results. We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer.
What is the lead time?
Standard sizes ship in 15–20 days. Large sizes and special options may take longer; we confirm the delivery date with your quote.
Need a Quote for This Valve?
Send size, PN, body material and quantity. An engineer replies within 24 hours.