Kelly valve

Shut-off valves for safe drilling and production processes

Kelly valves serve as safety valves in drilling rigs. The use of the Kelly valve allows for the interruption of the media flow inside the drill string. Depending on the requirements, we supply our Kelly valves with various overall lengths, outer and inner diameters, and thread types.

Thanks to their robust design, certified safety, and long service life, our special valves are a reliable solution for your plant.

Designs

STANDARD KELLY VALVE
(TYPE AUFR)

Kelly valve in the standard version with
one operating shaft

DOUBLE SHAFT KELLY VALVES
(TYPE AUFR)

Double Shaft Kelly Valve with one ball and two operating shafts

TWIN BALL QUAD SHAFT KELLY VALVES
(TYPE TUFR)

Kelly valve version with two balls
and four operating shafts

The following additional services are also available upon request:

BREAK IN (power make-up of Kelly valve connections before delivery for quick and easy installation)
SPARE PARTS KIT (sealing parts and/or wear parts)

Customized design

Individually manufactured for your processes

As drill string valves, Kelly valves provide reliable protection during pressure increases or kick situations. By moving the ball to the closed position, the metal-to-metal sealing system reliably prevents the outflow of the medium.

The valves are designed for a wide temperature range from
-46°C to +180°C (L/X), Class 2 according to API 7-1, and are characterized by durability, resistance, and the ability to operate at full differential pressure.
The Kelly valves are supplied for applications up to 10,000 psi and 15,000 psi, making them suitable for demanding high-pressure applications in the drill string.

CONNECTION	PRESSURE [PSI]	OD [IN]	ID [IN]	OVERALL LENGTH [SH/SH]	SIZE HEXAGON
STANDARD KELLY VALVES (TYPE AUFR) PIN X BOX THREADS
6 5/8 REG	10,000	7 3/4	3 1/4	350 mm	22.3 mm
6 5/8 REG	15,000	7.677″	3 1/16″	400 mm	22.3 mm
7 5/8 REG	15,000	8 1/2	3 1/16	385 mm	22.3 mm
			3 1/16	540 mm	22.3 mm
			3 1/2	406 mm	27 mm
		8 5/8	3 1/16	385 mm	22.3 mm
		10	3 1/4	385 mm	22.3 mm
8 5/8 REG	15,000	10	4 1/4	457.2 mm	22.3 mm
NC61	15,000	9	3 1/16	365 mm	22.3 mm
NC61	10,000	9	3 1/4	365 mm	22.3 mm
NC 38 (3 1/2 IF)	10,000	5 1/4	2	381 mm	19 mm
NC50 (4 1/2 IF)	10,000	6 5/8	2 13/16	381 mm	22.3 mm
DOUBLE SHAFT KELLY VALVES (TYPE AUFR) PIN X BOX THREADS
8 5/8 REG	15,000	10	4 1/4	457.2 mm	22.3 mm
6 5/8 REG	15,000	7.677″	3 1/16	470 mm	22.3 mm
TWIN BALL QUAD SHAFT KELLY VALVES (TYPE TUFR) BOX X BOX THREADS
NC 50	10,000	6 5/8	2 13/16	729.7 mm	19 mm
NC 61	10,000	7 3/4	3 1/16	800.1 mm	22.3 mm
NC 70	15,000	9 1/2	3 3/4	908 mm	22.3 mm

Certified safety for the use of Kelly valves

Our high-performance valves comply with national and international standards, including:

API Specification 7-1
ISO 9001:2015

Type Approval by ABS and DNV is available.

Contact us

The development of Hartmann Kelly valves is based on decades of experience in the oil, gas, and geothermal industries.

Hartmann Valves offers a complete package: short delivery times, warehousing in Germany, spare parts, and overhauls – all from a single source.

FAQ

What is a Kelly valve used for in a drilling rig?

A Kelly valve serves as a safety shut-off in the drill string. In the event of a pressure increase (‘kick’), the media flow can be safely interrupted by the metal-seated ball. This reliably prevents the outflow of hazardous media and ensures the operational safety of the drilling rig.

What temperature ranges do Hartmann Kelly valves cover?

Hartmann Valves Kelly valves are designed for a temperature range of -46°C to +180°C (L/X). This makes them suitable for both arctic environments and high-temperature drilling – with consistently reliable sealing and resistance to pressure differences.

Kelly valve

Shut-off valves for safe drilling and production processes