Audited Supplier
During drilling operation, when a well kick takes place and bit bore is blocked, the by-pass valve can be opened to allow fluid circulation and well killing. Before drilling in a gas formation, the By-Pass Valve shall be located near or on the bit.
When well kick take place and pump pressure is too high or blocked, the following
steps can be taken to open the By-Pass Valve :
- Discharge Kelly and drop in a steel ball (or a Nylon ball) which is carried by tool;
- Connect with Kelly;
- Put ball into retainer by pump circulation;
- When fluid is closed, the shear pin can be sheared off by adding 0.5~1.5MPa higher pump pressure than original pump pressure;
- After pin is sheared, the seal sleeve move down to open the discharge hole and pump pressure come to drop down , then normal circulation and well killing operation can be started.
When ordering please specify:
- O.D. of body;
- Connection;
- Pump pressure required to shear off pin (per customer requirement)
Model | Product Code | O.D. (mm) | Seal Sleeve (mm) | Top Connection (Box) | Bottom Connection | Pump Pressure of shear-off shear pin | O.D. of Steel Ball (mm) |
| PTF105 | F061053 | 105 | 32 | NC31 | NC31 (PIN) | 3-10 MPa | 35 |
| PTF121A | F061213 | 121 | 38 | NC38 | NC38 (PIN) | 3-10 MPa | 45 |
| PTF127 | F061273 | 127 | 38 | NC38 | NC38 (PIN) | 3-10 MPa | 45 |
| PTF127C | F061272 | 127 | 38 | NC38 | 3 1/2 REG (BOX) | 3-10 MPa | 45 |
| PTF159 | F061591 | 159 | 49 | NC46 | NC46 (PIN) | 3-10 MPa | 54 |
| PTF159B | F061594 | 159 | 49 | NC46 | 4 1/2 REG (BOX) | 3-10 MPa | 54 |
| PTF168 | F061681 | 168 | 50.8 | NC50 | NC50 (PIN) | 3-10 MPa | 57 |
| PTF203 | F062031 | 203 | 62 | 6 5/8 REG | 6 5/8 REG (PIN) | 3-10 MPa | 65 |
Tianhe principle is to offer high quality products at competitive price to benefit our customers and the industry in the long run.
We are the Leading manufacturer in China since 1973 for drilling /fishing /milling equipment for oil and gas.
We have established a complete quality control system, all products& equipments manufactured as per international standard and API standard.
Competitive Advantages
1. We offer high quality products at competitive price.
2. Shortest delivery time & Flexible payment terms.
3. Full range of drilling /fishing /milling equipment for oil and gas.
4. Timely after-sale service.
5. Imported International brands Machines such as Japan Mazak machining center, Austria WFL machining center etc
6. Complete quality control system, offices and testing equipment.
Dear customer,
Thanks for your time of visiting us on made in china, if you have any further questions and needs, please kindly inform us by inquiry online or contact us by below information.
We look forward to your kind reply, thanks very much.
Sales Manager
Tianhe Oil Group Huifeng Petroleum Equipment Co., Ltd.
