KELLY COCK
Application & General Use
Kelly cock valves close off the bore of the drill string, holding the mud column in the top drive or kelly when it is disconnected from the drill string. They control mud flow during normal drilling and are operated from the rig floor. A standard setup uses two: an upper and a lower kelly valve.
Product Description
The kelly cock valve is made in one-piece and two-piece designs, with a free passage for maximum circulation of drilling fluid and minimal pressure loss.
Kelly Cock Valves are supplied with either API or proprietary connections upon request.
All Kelly Cock Valves are manufactured according to the latest edition of the API 7-1 or NS1 specification.
KC2S Kelly Valves are available in either standard or H2S resistant versions and are supplied according to Class 1 construction.
Main features:
Kelly Cock Valves are supplied with either API or proprietary connections upon request.
All Kelly Cock Valves are manufactured according to the latest edition of the API 7-1 or NS1 specification.
KC2S Kelly Valves are available in either standard or H2S resistant versions and are supplied according to Class 1 construction.
Main features:
- Simple construction for trouble-free operations and easy servicing
- Sealed lubrication packing
- 10,000 or 15,000 PSI working pressure (testing pressure 15,000 and 22,500 PSI respectively)
- KC2S Kelly Valves are delivered with an operating wrench and disassembly tool
Other configurations available upon request, subject to engineering department approval.
The KC2S product range is available in 9 different series allowing the following passage IDs:
| 201 | 1-1/4 |
| 202 | 1-3/4 |
| 203 | 2-1/8 |
| 204 | 2-1/4 |
| 205 | 2-7/16 |
| 206 | 2-13/16 |
| 207 | 3-1/16 |
| 208 | 3-1/4 |
| 209 | 4-1/4 |
Hydraulic Testing
Each Kelly Valve is hydraulically bench tested according to API spec 7-1 (latest edition) and delivered with its individual pressure test records.
The tests are carried out in two steps:
The tests are carried out in two steps:
- SHELL TESTING during which the valve is pressurized to the test pressure for 3 minutes, then depressurized and pressurized again for at least 10 minutes.
- SEAT TESTING during which the valve is pressurized from the pin end to its working pressure for at least 5 minutes.
During the pressure-holding period timing starts when pressure stabilization is achieved. No visually detectable leakage is permitted during the test time period and the pressure drop shall be no greater than maximum 1% of the pressure test value with a zero leak rate.
Valve Compatibility
When an RDCV has to be dropped into the drill string, its OD must pass through the free ID of the KC2S kelly cock. The table shows which KC2S kelly cocks and RDCV series are compatible.
| KC2S SERIES | KC2S ID (IN) | RDCV SERIES |
|---|---|---|
| 202 | 1-3/4 ID | 901 |
| 203 | 2-1/8 ID | 902 |
| 204 | 2-1/4 ID | 903 |
| 204/205 | 2-1/4 / 2-7/16 ID | 904 |
| 206 | 2-13/16 ID | 905 |
| 207 | 3-1/16 ID | 906 |
| 207 | 3-1/16 ID | 907 |
| 208 | 3-1/4 ID | 908 |
One Piece Kelly Cock Valve
Figure 1 – Kelly Cock
Cutaway view
Figure 2 – Kelly Cock
Exploded view
| TYPE OF KIT | DESCRIPTION | STANDARD VERSION | H2S TRIM VERSION |
|---|---|---|---|
| Seal Kit | Includes all parts needed for replacement each time the Valve is disassembled; i.e. O-Ring Seals, Springs, Knob Plate and Snap Ring or Screw Set. | Items 2, 6, 8, 9, 11, 13 & 14 | Items 6, 8, 9, 11, 13, 14 & 17 |
| Complete Repair Kit with Tooling | Includes all inside Valve components plus its Operating Wrench and Disassembling Tool. | Items 2 to 16 | Items 3 to 14 &17 |
| Complete Repair Kit without Tooling | Includes all KC2S Inside Valve components. | Items 2 to 14 | Items 3 to 17 |
Two Piece Kelly Cock Valve
Figure 1 – Kelly Cock
Cutaway view
Figure 2 – Kelly Cock
Exploded view
| TYPE OF KIT | DESCRIPTION | STANDARD VERSION | H2S TRIM VERSION |
|---|---|---|---|
| Seal Kit | Includes all parts needed for replacement each time the Valve is disassembled; i.e. O-Ring Seals, Springs, Knob Plate and Snap Ring or Screw Set. | Items 2, 6, 8, 9, 11, 13 & 14 | Items 6, 8, 9, 11, 13, 14 & 17 |
| Complete Repair Kit with Tooling | Includes all internal parts plus Operating Wrench and Disassembling Tool. | Items 2 to 16 | Items 3 to 14 &17 |
| Complete Repair Kit without Tooling | Includes all internal parts. | Items 2 to 14 | Items 3 to 17 |
Operational Benefits
Command Tubular Products offers KC2S Kelly Valves with PTFE rings inserted in both upper and lower seats, which provide high sealing capability, even at low pressures. KC2S internal parts are made of high grade heat treated stainless steel. The design of the body limits plug rotation to 90° between open and closed positions. Two KC2S versions are offered to suit drilling environments:
- The standard version, for normal drilling conditions, with a surface-treated bore for better resistance to mud corrosion and easier maintenance.
- The H2S trim version which has been designed for H2S environments with internal parts made of corrosion resistant materials matching the NACE MR0175 standard (latest edition), fitted in a standard body.
- Full NACE available upon request.