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GB/T 12236 Flanged Check Valve
SWING & LIFT TYPE · PN10–PN320 · BACKFLOW PROTECTION
The GB/T 12236 Flanged Check Valve is an automatic non
return valve that prevents reverse flow in pipeline systems,
protecting pumps, compressors, and other upstream
equipment from backflow damage. Manufactured to GB/T
12236 standards, it is available in swing check and lift check
configurations to suit horizontal and vertical pipeline
installations across a pressure range from PN10 to PN320.
| GB/T 12236 | |
|---|---|
| Pressure Rating | PN10 / PN16 / PN25 / PN40 / PN64 / PN100 / PN160 / PN320 |
| Size Range | DN25 – DN1000 |
| Body Material | WCB · CF8 · CF8M · WC6 · WC9 |
| Valve Type | Swing Check / Lift Check |
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— Full Specifications
GB/T 12236 Flanged Check Valve - Parameter Table
| PARAMETER | SPECIFICATION |
|---|---|
| Standard | GB/T 12236 |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 / PN64 / PN100 / PN160 / PN320 |
| Size Range | DN25 – DN1000 |
| Body Material | WCB / CF8 (304SS) / CF8M (316SS) / WC6 / WC9 |
| Disc Material | WCB+STL / CF8 / CF8M |
| End Connection | Flanged – GB/T 9113 / RF / FF Face |
| Valve Type | Swing Check Valve / Lift Check Valve |
| Installation | Horizontal / Vertical (Upward Flow) – Type Dependent |
| Cracking Pressure | ≤ 0.03 MPa (Swing Type) |
| Leakage Class | GB/T 26480 Class A / API 598 |
| Test Standard | GB/T 26480 / API 598 (100% Factory Pressure Test) |
| Temperature Range | -29°C ~ +425°C (Material Dependent) |
| Applicable Media | Water / Steam / Oil / Gas / Non-Corrosive Media |
Our Production Process
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2. Machining
3. Testing
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· Product documentation
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This Product Spec Sheet
Single-page datasheet for GB/T 12236 Flanged Check Valve.
- Full parameter table
- Dimensional drawing
- Materials & standards list
- Ordering code guide
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— WHY bAUTU
Why Specify This Valve from Bautu
Swing Check vs Lift Check Design
The swing check valve features a hinged disc that opens under forward flow and closes by gravity and backpressure, offering low pressure drop and suitability for large diameter, low-velocity pipelines. The lift check valve uses a piston guided disc for faster response and tighter shutoff, recommended for high-pressure, high-velocity steam and liquid service applications.
Stellite-Hardened Seating Surfaces
Stellite overlay on disc and seat contact faces provides superior hardness (HRC 38–45) and resistance to wire drawing erosion caused by high-velocity fluid impingement. This ensures long-term sealing integrity and extended maintenance intervals in demanding steam, oil, and gas pipeline environments.
— FAQ
Frequently Asked Questions
What is a GB/T 12236 flanged check valve?
GB/T 12236 is the Chinese national standard for flanged check valves used in industrial pipeline systems. Check valves allow media to flow in one direction only, automatically preventing backflow to protect pumps, compressors, and downstream equipment from damage. Bautu manufactures GB/T 12236 flanged check valves in pressure ratings from PN10 to PN320, covering a wide range of industrial applications including water treatment, chemical processing, steam systems, and oil and gas pipelines. Body materials include WCB carbon steel, CF8M stainless steel, and ductile iron.
What is the difference between swing type and lift type check valves?
A swing type check valve uses a hinged disc that swings open with forward flow and closes by gravity when flow stops or reverses. It offers low pressure drop and suits horizontal or vertical pipelines with moderate flow velocities — commonly used in water supply, HVAC, and general process lines. A lift type check valve uses a disc or piston that rises vertically off its seat as flow passes through, then drops back to seal under gravity or spring force. Lift type valves provide tighter shut-off and respond faster to flow reversal, making them ideal for high-pressure steam lines, pump discharge, and vertical upward-flow pipelines. Bautu offers both types; contact our engineers to select the right design for your flow conditions and pipe orientation.
What is the standard lead time, and can Bautu handle custom requirements?
Standard GB/T 12236 flanged check valves are delivered in 3–5 weeks from order confirmation. High-pressure ratings (PN160–PN320) or large diameter sizes typically require 5–8 weeks. Bautu supports custom configurations including Stellite-hardfaced seating surfaces for abrasive or erosive service, special trim materials (316SS, Duplex), spring-assisted closure, and third-party inspection (SGS, BV, TÜV). Submit your pipeline datasheet or project specifications for a detailed quotation within 24 hours.
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