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| High Pressure Fluid Control Products |
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| High-pressure manifold |
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| Surface well test manifold |
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| Jiangsu Shimai Machinery Co., Ltd. >> Graphic products >> Check Valves |
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| Check valve |
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| Straight Check Valve |
Swing Check Valve |
Dart Check Valve |
Ⅰ. Product Overview
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Check Valve is primarily used to isolate well fluids and other media. Installed in high-pressure pipelines, the flapper or dart inside the valve automatically closes and seals when fluid attempts to flow back, thus preventing reverse flow . The check valve is forged from high-strength alloy steel, features a streamlined exterior, and uses Hammer Union end connections for easy assembly and disassembly within the pipeline. It offers a long service life under high-pressure conditions and is designed and manufactured strictly in accordance with API-6A standards.
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The main components of the high-pressure check valve include the body, bonnet, seat, and stem.
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The check valve is available in three structural configurations: Straight Flapper Type, Top Cover Flapper Type , and Dart Type . The end connection is a Hammer Union.
Ⅱ. Design Features
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High Structural Strength: The check valve is forged from high-strength alloy steel.
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Convenient Installation/Disassembly: The Hammer Union end connections allow for easy installation and removal from the pipeline.
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Excellent Sealing Performance: The surface of the internal flapper is vulcanized with a layer of Hydrogenated Nitrile Butadiene Rubber (HNBR), ensuring excellent sealing performance for the valve.
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Long Service Life: Provides an extended service life when subjected to high pressure.
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Easy Maintenance: The check valve can undergo routine maintenance without being removed from the high-pressure pipeline.
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Strong Environmental Adaptability: The high-pressure check valve is suitable for conventional operations, and customers can also order versions specifically designed for sour gas service.
| Straight Check Valve |
Swing Check Valve |
Dart Check Valve |
- Forged from high-strength alloy steel, with a streamlined exterior, and easy to install.
- The valve body has a clear flow direction indicator.
- The installation position should be kept horizontal, with the base facing down.
- Available in two types: Standard Flow and Reverse Flow (or Counterflow).
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Simple structure, allowing for in-line maintenance.
Clear flow direction indicator on the body. |
Installation direction is not restricted.
Simple to install and dismantle.
Possesses a certain self-locking capability.
More suitable for gas-tight sealing environments. |
III. Main Technical Specifications of the Check Valve
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Working Pressure：42 MPa～140 MPa
Nominal Bore Size： 2″～3″
Temperature Rating：-29 ℃～121 ℃ （Temperature Rating P U）
Manufacturing Standard：API 6A |
| Standard Flow Straight-Flapper Check Valve |
Reverse Flow Straight-Flapper Check Valve |
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| Model |
Specification |
Working Pressure |
Overall Dimensions（mm） |
End Connection Type |
Flow Direction |
Service Condition |
| L |
A |
H |
DXF-105-2Z
|
2" |
105MPa |
358 |
120 |
214 |
FIG1502（F×M） |
Standard Service Condition |
Standard Service Condition |
| DXF-105-2Z |
2" |
105MPa |
358 |
120 |
214 |
FIG1502（F×M） |
Reverse Flow Service Condition |
| DXF-140-2Z |
2" |
140MPa |
429 |
134 |
236 |
FIG2002（F×M） |
Standard Service Condition |
| DXF-105-3Z |
3" |
105MPa |
403 |
137 |
242 |
FIG1502（F×M） |
Standard Service Condition |
| DXF-105-3Z |
3" |
105MPa |
403 |
137 |
242 |
FIG1502（F×M） |
Reverse Flow Service Condition |
| DXF-140-3Z |
3" |
140MPa |
578 |
189 |
356 |
FIG2002（F×M） |
Standard Service Condition |
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Working Pressure：42 MPa～105 MPa
Nominal Bore Size： 2″～3″
Temperature Rating：-29 ℃～121 ℃ （Temperature Rating P U）
Manufacturing Standard：API 6A |
| Swing Check Valve |
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| Model |
Specification |
Working Pressure |
Overall Dimensions（mm） |
End Connection Type |
Flow Direction |
Service Condition |
| L |
A |
H |
DXF-105-2S
|
2" |
105MPa |
318 |
80 |
176 |
FIG1502(F×M) |
Standard Service Condition |
Standard Service Condition |
| DXF-105-3S |
3" |
105MPa |
421 |
88 |
216 |
FIG1502(F×M) |
Standard Service Condition |
Standard Service Condition |
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Working Pressure：42 MPa～105 MPa
Nominal Bore Size： 2″～3″
Temperature Rating：-29 ℃～121 ℃ （Temperature Rating P U）
Manufacturing Standard：API 6A |
| Dart Check Valve |
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| Model |
Specification |
Working Pressure |
Overall Dimensions（mm） |
End Connection Type |
Flow Direction |
Service Condition |
| L |
A |
H |
DXF-105-2F
|
2" |
105MPa |
332 |
80 |
158 |
FIG1502)F×M) |
Standard Service Condition |
Standard Service Condition |
| DXF-105-3F |
3" |
105MPa |
420 |
113 |
175 |
FIG1502)F×M) |
Standard Service Condition |
Standard Service Condition |
IV. Check Valve Repair Kit
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Straight Check Valve Repair Kit
① O-ring Seal Ⅰ ②Valve Seat ③ Flapper ④ Flapper Hinge Pin ⑤ Support Ring ⑥ O-ring Seal Ⅱ⑦ Dust Seal
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Swing Check Valve Repair Kit
①Support RingⅠ ②O-ring Seal Ⅰ ③Support RingⅡ ④ O-ring Seal Ⅱ ⑤Elastic Cylindrical Pin ⑥ Disc/Flapper Hanger⑦ Flapper Hinge Pin ⑧ Valve Seat⑨ Flapper
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Dart Check Valve Repair Kit
①O-ring Seal ②Dart ③O-ring Seal Ⅰ ④Dart Seal ⑤Seal Retainer ⑥Lock Nut ⑦ Spring ⑧O-ring Seal |
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 钻井、修 井设备规范 |
钻井、修 井设备规范 |
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| 钻井、修 井设备规范 |
钻井、修 井设备规范 |
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| 钻井、修 井设备规范 |
钻井、修 井设备规范 |
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| 钻井、修 井设备规范 |
钻井、修 井设备规范 |
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