Keystone K-LOK® Series 36/37 High Performance Butterfly Valve with Manual Actuator

The Keystone K-LOK® Series 36/37 High Performance Butterfly Valve with Manual Actuator, engineered by Emerson, is a premium double-offset, high-performance butterfly valve designed for superior sealing, precise flow control, and extended service life in demanding industrial applications. The K-LOK® Series 36/37 features a double-offset disc design that minimizes seat wear and operating torque, ensuring smooth operation and tight shutoff even after prolonged use. Its robust construction and resilient seat design provide zero-leakage performance, while the manual actuator offers reliable, easy, and precise control for both throttling and on/off service. Engineered for high-pressure, high-temperature, and corrosive media, this valve is widely used across oil and gas, petrochemical, power generation, pulp and paper, and water treatment industries. With fire-safe, anti-blowout, and bidirectional sealing features, the Keystone K-LOK® delivers maximum safety, durability, and reliability for critical operations.

Feature of Keystone K-LOK® Series 36/37 High Performance Butterfly Valve with Manual Actuator

• K-LOK polymer and elastomer seats provide bi-directional, drop-tight shut-off in vacuum as well as at full rated differential pressure.
• Blow-out resistant shaft is standard on all valves for increased safety.
• Unique packing design allows for use in pressure as well as vacuum without modification or special assembly.
• Disc taper pins are tangentially positioned half in disc and half in shaft, placing them in compression rather than shear, which eliminates potential for failure.
• Rocker-shaped gland bridge compensates for uneven adjustment of gland nuts reducing packing leaks.
• Integrally cast disc position stop perfectly locates the disc in seat, achieving maximum seat and seal life.
• Extended neck allows for 50 mm (2") of pipeline insulation.
• Integrally cast mounting pad provides direct mounting of actuators eliminating the need for costly brackets and couplings.
• Flattened body bore at shaft journal ports positions shaft bearings near disc, providing maximum shaft support resulting in reduced wear and longer life.

• ENGINEERED FOR RELIABILTY – Robust construction in a variety of materials with features such as full and life-long lubrication available.
• FLEXIBLE CONFIGURATION – Where available with the type of manual actuator, the solution can be configured with adjustable travel stops, worm and quadrant style gearboxes and anti-clockwise operation.
• SIMPLE INSTALLATION – Modular mounting concept for easy attachment to Emerson valves and can be mounted in most orientations.
• CUSTOMIZABLE OPTIONS – Achieve reliable efficient isolation to match your specific application with many available optional extras including chain wheels, limit switches, floor stands and security features.

Technical Specification of Keystone K-LOK® Series 36/37 High Performance Butterfly Valve with Manual Actuator

Size Range

NPS 2 – 36 (DN 50 – 900)

Temperature Rating

-40°F to 1000°F (-40°C to 538°C)

Pressure Rating

ASME Class 150 – 300

Material

316 Stainless Steel, 316L Stainless Steel, Carbon Steel, Duplex, Stainless Steel, Super Duplex

Pressure Class

ASME

Process Connection Type

150RF, 300RF

Seat/Seal Type

High performance

Shutoff Class

Zero Leakage

Standards

API 609, ASME B16.34

Valve Size

PS 10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, NPS 16 / DN 400, NPS 18 / DN 450, NPS 2 / DN 50, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 24 / DN 600, NPS 3 / DN 80, NPS 4 / DN 100, NPS 6 / DN 150

Valve Size Standard

NPS

Valve Type

Butterfly, High performance Butterfly Valve