
When landing the casing, the drill fluid has no resistance to float shoes. The pressure of circulating mud make the valve head down a displacement, the disc of valve rod's end will fall off automatically; after stop pumping,the valve press the valve seat upwards under the action of spring, the float valve becomes one-way valve. So that can pump the drilling fluid and cement slurry into it from up to down, but the fluid in the casing or outside casing annulus can't be return to prevent from back flow.


| Casing Sizes (inch) | OD mm(inch) | OAL mm(inch) | Conn. | Pressure(MPa) |
| 4-1/2 | Φ127(5) | 370(14-9/16) | 4-1/2 BCSG | 20,25 |
| 5 | Φ142.38(5-5/8) | 415(16-21/64) | WSP-3T | 20,25 |
| 5-1/2 | Φ154(6-1/16) | 400(15-3/4) | 5-1/2 BCSG | 20,25 |
| 6-5/8 | Φ187.7(7-25/64) | 500(19-11/16) | 6-5/8 BCSG | 20,25 |
| 7 | Φ194.5(7-21/32) | 535(21-1/16) | 7 BCSG | 20,25 |
| 9-5/8 | Φ270(10-5/8) | 550(21-21/32) | 9-5/8 BCSG | 20,25 |
| 13-3/8 | Φ365(14-3/8) | 550(21-21/32) | 13-3/8 BCSG | 20,25 |

Best-all Petro is located in Dongying City, which is famous for Shengli Oilfield. It is the largest petroleum equipment manufacturing center in China. Best-all Petro is a professional manufacturer of mud pump spare parts. We have obtained API 7K certification and ISO international quality certification.Our main products are: bi-metal cylinder liner, ceramic cylinder liner, hydraulic cylinder, piston, valve assembly and other mud pump spare parts.Our products are not only widely used in the domestic market such as Shengli Oilfield, but also exported to Central Asia, the Middle East, Southeast Asia, North America, South America and other countries in the world. The company follows the principle of "quality first, integrity-based." Because of excellent quality, reasonable price and professional service, we have been highly recognized by customers. Our vision is to become a trusted partner of the international oil equipment industry. Our mission is to provide customers with first-class products and services,and create more value for global customers.


1.How do you transport the goods?We transport the goods by container. we possesses long term cooperation with ship agency which can provide you lowest shipping fee. For samples we can send by express.
2.Can you satisfy my special requirement?
Definitely! we have strong design capacity and R&D capacity!
3.Which shipment terms can you accept?
EXW FOB CNF CIF DDU DDP




















