Features & benefits

• Factory testing of every valve at full rating ensures 100% tight shut-off.
• Actuator flange is standardized for easy operator interchangeability and mount direct to Keystone range of actuators.
• Primary seal is formed by the disc-hub and stem top, the seat contact exceeds the pressure rating of the valve.
• Secondary stem seal is suitable for pressure and vacuum is self-adjusting.
• Patented dove-tail seat requires no bonding. Makes seat replacement simple and fast. Extra heavy edge section resists tearing.
• The disc hub edge are rounded and hand polished to provide full concentric seating without seat obstruction to flow, combined with maximum seat life.
• Replacement seat isolates the stem and body parts from the stream and also serves as the flange gasket.
• Moulded-in 'O'-ring provides positive flange sealing and eliminates the need for gaskets.
• Heavy duty top bushing absorbs side thrust and torque loads.
• Heavy-duty increased diameter through-stem design for high strength and positive disc control.
• Stainless steel disc screws, sllow quick and easy dis-assembly.
• Variations utilising Buna N or EPDM seats and other material combinations available on special request.

General Applications

The Keystone figure1 butterfly valve is ideal for general purpose applications. The through shaft design is a reliable solution in arduous circumstances in the shipbuilding industry, waterworks, heating and ventilation, powerplants, chemical industry and many other applications.

Technical Data

• Pressure(kg/cm2) : 10
• Temperature(°C) : -40~120
• Size (mm) : 50~1000
• Flange accommodation : JIS/KS 5K/10K ANSI 150
• Other flange accommodation : Consult factory.