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Keystone Butterfly Valves Keystone Butterfly Valves
Keystone GRW GRL

A complete butterfly valve line to provide optimal performance.

Emerson's Keystone portfolio offers a complete range of butterfly valves from general purpose through to heavy duty and high performance models.  With a tradition of more than 70 years, Keystone has built its reputation on providing industrial process butterfly valves known for their reliability, long service life and reduced operating costs.
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Keystone Family of Products

Control Valves

High Performance Butterfly Valves

Keystone Series HiLok High Performance Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Series HiLok High Performance Butterfly Valves
Keystone WINN Hi-Seal High Performance Butterfly Valve
Emerson
Keystone Butterfly Valves
Keystone WINN Hi-Seal High Performance Butterfly Valve
Keystone Figure 360/362 and 370/372 K-LOK High Performance Butterfly Valve
Emerson
Keystone Butterfly Valves
Keystone Figure 360/362 and 370/372 K-LOK High Performance Butterfly Valve
Keystone K-LOK Series 36/37 High Performance Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone K-LOK Series 36/37 High Performance Butterfly Valves

Resiliant Seated Butterfly Valve

Keystone Series GR Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Series GR Butterfly Valves
Keystone Series GRW/GRL Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Series GRW/GRL Butterfly Valves
Keystone Figure 990/920 Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Figure 990/920 Butterfly Valves
Keystone Model OptiSeal F14­F17 Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Model OptiSeal F14­F17 Butterfly Valves
Keystone Figure 56 Resilient Seated Butterfly Valve
Emerson
Keystone Butterfly Valves
Keystone Figure 56 Resilient Seated Butterfly Valve
Keystone Figure 221/222 Butterfly Valves
Emerson
Keystone Butterfly Valves
Keystone Figure 221/222 Butterfly Valves

Floating Ball Valves

K-Ball Figure 190 Floating Ball Valve
Emerson
Keystone Butterfly Valves
K-Ball Figure 190 Floating Ball Valve
K-Ball Figure 180 Floating Ball Valves
Emerson
Keystone Butterfly Valves
K-Ball Figure 180 Floating Ball Valves
K-Ball Figure 171 Floating Ball Valves
Emerson
Keystone Butterfly Valves
K-Ball Figure 171 Floating Ball Valves

Check Valves

Keystone F86 Swing Type Check Valve
Emerson
Keystone Butterfly Valves
Keystone F86 Swing Type Check Valve

Slurry Butterfly Valves

Keystone Figure 638 F638 Series E/Series 2 Slurry Valves
Emerson
Keystone Butterfly Valves
Keystone Figure 638 F638 Series E/Series 2 Slurry Valves
Keystone F634 Slurry Control Valve
Emerson
Keystone Butterfly Valves
Keystone F634 Slurry Control Valve
Keystone Figure 635 Slurry Control Valves
Emerson
Keystone Butterfly Valves
Keystone Figure 635 Slurry Control Valves
Keystone Figure 637 Slurry Control Valve
Emerson
Keystone Butterfly Valves
Keystone Figure 637 Slurry Control Valve

Pneumatic Actuators

Keystone F89 Pneumatic Quarter-turn Actuator
Emerson
Keystone Butterfly Valves
Keystone F89 Pneumatic Quarter-turn Actuator

Gear Operators

Keystone Figure 427 Bevel Gear Operators
Emerson
Keystone Butterfly Valves
Keystone Figure 427 Bevel Gear Operators
Keystone Figure 427 Chain Wheel
Emerson
Keystone Butterfly Valves
Keystone Figure 427 Chain Wheel
Keystone Figure 427 Gear Operator
Emerson
Keystone Butterfly Valves
Keystone Figure 427 Gear Operator
Butterfly valves offer true isolation and control capabilities in a single product. Designed for accurate flow and pressure control, they are ideal in applications where positive isolation is required.
Butterfly valves offer reliable high-cycle service for applications in the Oil & Gas (upstream and downstream), Energy (power and steam distribution), Chemical, Petrochemical, Pulp & Paper, HVAC (Institutional), Water and Waste Water Treatment, Life Science and Food & Beverage industries. Butterfly valves can replace gate, ball and globe valves very cost-effectively.
Keystone K-LOK Series

High Performance

Suitable for throttling applications that require extremely low leak rates.
Keystone Series 221 222

Resilient Seated

The preferred solution for sanitary and corrosion or erosion resistance in control or isolation applications.

Cornerstone has the Keystone valves inventory and experience to specify and deliver the optimal butterfly solution to meet your application and specification needs and requirements.

Get in touch with an expert, find your nearest office location, or send us a note about your next project.
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Keystone Series 221/222
Keystone Series 221/222
The Series 221/222 is a top quality, superior performing resilient seated butterfly valve built for the most demanding installations. We offer 2”-12” sizes in lug and wafer designs with various seat and disc options. Our bi-directional dead-end capability, up to 250 PSI, makes this design a preferred general utility option.
Keystone GRW/GRL
Keystone GRW/GRL
The Series GRW/GRL is a heavy-duty resilient seated butterfly valve with a field replaceable seat, available in a wide choice of materials for many demanding applications. With a pressure rating up to 230 PSI, this valve is the leader in performance. We offer an optional EPDM seat with a 300° F rating. These valves are available in 2”-36” sizes, in both wafer and lug designs.
Keystone Series K-LOK High Performance
Keystone Series K-LOK High Performance
The K-LOK High Performance Butterfly Valve offers unique features that allow the valve to exceed all other designs within its class. A high CV disc with a true interference seat makes the K-LOK the best performing product available for general and critical applications. The valves are available with PTFE, RTFE, elastomer, fire-safe and metal seats, in a wide range of body and disc materials from 2”-36” with optional direct mounting actuation to eliminate costly brackets and couplings.