When it comes to Butterfly Valves, Keystone is a household name. Keystone was the pioneer of the butterfly valve and began manufacturing in 1951. Since then we have developed many butterfly valve styles designed to suit various applications and industries. This range of valve styles can be seamlessly integrated by direct mounting with the Keystone range of pneumatic/electric actuators and accessories, to create complete flow control packages.

Resilient Seated Butterfly Valves
A versatile range of resilient seated quarter-turn butterfly valves is available in various designs, configurations and materials to match all specifications.

• Cartridge seat, dovetail seat, and molded seat designs
• Size range from 2"-48" Custom up to 102"
• Pressure rating from full vacuum to 250 psi
• Temperature range from -20°F to 350°F
• Multiple seat, body and disc materials available to suit many applications

High Performance Butterfly Valves
The K-LOK high performance butterfly valve is available in polymer seats as well as metal and firesafe. These are designed to the API 609 and MSS-SP68 specifications. They are used in the marine, water, oil, gas and process industries.

• Size range from 2"-36" (larger diameters on request)
• Pressure range 250/740 psi, ASME class 150/300
• Temperature range from -58ºF to 1100ºF

Check Valves
Prince and Gulf are well known names in the wafer check valve industry. Both brands have significant installed base and offer many styles and materials for a variety of industries and applications. Prince is a wafer style swing check and Gulf is a double door style check valve.

• Size range from 2"-36" (larger diameters on request)
• Pressure range 250/740 psi, ASME class 150/300
• Temperature range from -58ºF to 842ºF (-50ºC to 450ºC)