1. Product Overview
Check valves are installed in pup joints to isolate well fluids and service fluids and prevent backflow from affecting equipment and lines.
When reverse flow occurs, the flapper or dart inside the valve closes automatically to form a seal and provide one-way flow control.
The product mainly consists of a valve body, bonnet, seat, stem, and related parts. Structural types include inline flapper type, top-entry flapper type, and dart type. End connections are usually union connections.
2. Design Features
The valve body is forged from high-strength alloy steel and has high structural strength, making it suitable for long-term use in pup joints.
Union connections at both ends enable quick field dismantling, inspection, maintenance, and line assembly.
Internal sealing areas use HNBR and other sealing materials to improve sealing reliability under high-pressure service.
Multiple structural forms can be selected according to line layout, flow direction, and maintenance requirements.
3. Check Valve Main Technical Parameters
Working Pressure: 6,000 psi (42 MPa) to 20,000 psi (140 MPa) (inline flapper type), 6,000 psi (42 MPa) to 15,000 psi (105 MPa) (top-entry flapper type and dart type)
Nominal Bore: 2″ to 3″
Temperature Class: -29 ℃ to 121 ℃ (PU class)
Manufacturing Standard: API 6A
| Model | Specification | Working Pressure | Overall Dimensions (mm) | Connection Type | Flow Direction | Service Condition | ||
|---|---|---|---|---|---|---|---|---|
| L | A | H | ||||||
| 2" Fig 1502, 15,000 psi, F × M | 2" | 15,000 psi | 358 | 120 | 214 | Fig 1502 (F×M) | Standard | Standard |
| 2" Fig 1502, 15,000 psi, F × M, Reverse Flow | 2" | 15,000 psi | 358 | 120 | 214 | Fig 1502 (F×M) | Reverse Flow | Standard |
| 2" Fig 2002, 20,000 psi, F × M | 2" | 20,000 psi | 429 | 134 | 236 | Fig 2002 (F×M) | Standard | Standard |
| 3" Fig 1502, 15,000 psi, F × M | 3" | 15,000 psi | 403 | 137 | 242 | Fig 1502 (F×M) | Standard | Standard |
| 3" Fig 1502, 15,000 psi, F × M, Reverse Flow | 3" | 15,000 psi | 403 | 137 | 242 | Fig 1502 (F×M) | Reverse Flow | Standard |
| 3" Fig 2002, 20,000 psi, F × M | 3" | 20,000 psi | 578 | 189 | 356 | Fig 2002 (F×M) | Standard | Standard |
| Model | Specification | Working Pressure | Overall Dimensions (mm) | Connection Type | Flow Direction | Service Condition | ||
|---|---|---|---|---|---|---|---|---|
| L | A | H | ||||||
| 2" Fig 1502, 15,000 psi, F × M | 2" | 15,000 psi | 318 | 80 | 176 | Fig 1502 (F×M) | Standard | Standard |
| 3" Fig 1502, 15,000 psi, F × M | 3" | 15,000 psi | 421 | 88 | 216 | Fig 1502 (F×M) | Standard | Standard |
| Model | Specification | Working Pressure | Overall Dimensions (mm) | Connection Type | Flow Direction | Service Condition | ||
|---|---|---|---|---|---|---|---|---|
| L | A | H | ||||||
| 2" Fig 1502, 15,000 psi, F × M | 2" | 15,000 psi | 332 | 80 | 158 | Fig 1502 (F×M) | Standard | Standard |
| 3" Fig 1502, 15,000 psi, F × M | 3" | 15,000 psi | 420 | 113 | 175 | Fig 1502 (F×M) | Standard | Standard |
4. Check Valve Repair Kit
Inline Flapper Check Valve Repair Kit
① O-ring I ② Seat ③ Flapper ④ Flapper shaft ⑤ Support ring ⑥ O-ring II ⑦ Dust seal ring
Top-Entry Flapper Check Valve Repair Kit
① Support ring I ② O-ring I ③ Support ring II ④ O-ring II ⑤ Spring dowel pin ⑥ Flapper bracket ⑦ Flapper shaft ⑧ Seat ⑨ Flapper
Dart Check Valve Repair Kit
① Seal ring ② Dart ③ O-ring I ④ Dart seal ring ⑤ Seal pressing plate ⑥ Lock nut ⑦ Spring ⑧ O-ring
