Kelly valve is a manually operated ball-type valve for the drill stem, divided into upper and lower sections. The upper Kelly valve is connected between the lower end of the swivel and the upper end of Kelly. The lower Kelly valve is connected between the upper end of the drill pipe and the lower end of Kelly or the lower end of Kelly saver subs. The Kelly valve can be opened or closed off by simply turning a special operating wrench 90° according to the indicated direction.
Key Valve is a manually operated ball-type valve for the drill stem, divided into upper and lower sections. The upper Kelly valve is connected between the lower end of the swivel and the upper end of Kelly. The lower Kelly valve is connected between the upper end of the drill pipe and the lower end of Kelly or the lower end of Kelly saver subs. The Kelly valve can be opened or closed off by simply turning a special operating wrench 90° according to the indicated direction.
The sealing principle for the Kelly valve is to ensure a close seat between the ball and the ball seat. The lower seat is supported by a spring. The force provided by the spring keeps the ball securely in place with a lower seat.
During normal drilling operation, the hole is kept unblocked by turning the stem to the “on” position; In case of kick or blowout, turn the operating stem to the “off” position to close off the internal bore of the drill string, the kick or blowout accident is avoided due to a high-pressure sealing situation between the ball and the ball seat.
| Model | O.D.(mm) | Thread connection | I.D. (mm) | Working pressure (Mpa) |
|---|---|---|---|---|
| XS-86 | 86 | NC26 | 30 | 30,70,105 |
| XS-105 | 105 | NC31 | 40 | 30,70,105 |
| XS-111 | 111 | NC31 | 40 | 30,70,105 |
| XS-121 | 121 | NC38 | 44.5 | 30,70,105 |
| XS-127 | 127 | NC38 | 44.5 | 30,70,105 |
| XS-140 | 140 | NC40 | 57.2 | 30,70,105 |
| XS-XS146 | 146 | 4-1/2 REG | 57.2/44.5 | 30,70,105 |
| XS-159 | 159 | NC46 | 61 | 30,70,105 |
| XS-165 | 165 | NC46 | 61 | 30,70,105 |
| XS-168 | 168 | NC50 | 71.4 | 30,70,105 |
| XS-178 | 178 | NC50,5-1/2 FH | 71.4 | 30,70,105 |
| XS-XS197 | 197 | 6-5/8 REG | 76.2 | 30,70,105 |
| XS-XS200 | 200 | 6-5/8 REG | 76.2 | 30,70,105 |
Versatile Installation: Available in both upper and lower configurations:
Upper Kelly Valve: Positioned between the swivel and the kelly.
Lower Kelly Valve: Located between the kelly and the drill pipe.
Robust Construction: Manufactured from a single piece of forged AISI 4145H (40CrMnMo) modified alloy steel, fully heat-treated to achieve a Brinell hardness of 285–341 and a minimum impact strength of 40 ft-lb (54J).
Pressure Ratings: Designed to withstand working pressures of 5,000 psi (35 MPa), 10,000 psi (70 MPa), and 15,000 psi (105 MPa).
Full Bore Design: Ensures unrestricted flow and allows the passage of tools without interference.
Sealing Mechanism: Features a metal-to-metal seal with a stainless steel ball and a spring-supported lower seat to maintain a secure seal under high-pressure conditions.
Operational Simplicity: Operated using a special wrench that turns the stem 90°, clearly marked for open and closed positions.
Corrosion Resistance: Available with H₂S corrosion-resistant materials compliant with NACE MR0175 standards, suitable for sour gas environment
Well Control: Provides a means to quickly shut off the drill string to prevent blowouts.
Pressure Management: Allows for control over unexpected pressure surges during drilling operations.
Maintenance Operations: Facilitates safe disconnection of the Kelly from the drill string without fluid loss.
API 7-1: Manufactured in accordance with API 7-1 specifications for drilling equipment.
NACE MR0175: Available in materials compliant with NACE MR0175 for resistance to sulfide stress cracking in sour gas environments.
Operating Wrench: Included for valve operation.
Thread Protectors: Provided to safeguard threads during transportation and storage.
Repair Kits: Major repair kits are available for all valve models to ensure longevity and performance.
Certified Test Reports: Each valve comes with a certified test report verifying its performance and compliance with industry standards.
API 7-1 Standard: Manufactured and tested in accordance with API Specification 7-1.
ISO 9001:2015: Production processes comply with ISO 9001:2015 quality management systems.
NACE MR0175 Compliance: Suitable for use in H₂S environments, meeting NACE MR0175 standards for corrosion resistance.
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