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High Performance Butterfly Valves

The conical sealing design of butterfly valves ensures that the metal sealing components are never in contact until the final degree of closure, resulting in repeatable sealing and a vastly extended valve life. In other valves, the steady effects of deformation and friction substantially decrease the life expectancy after the first operation. In contrast, Qublock’s butterfly valves design can provide reliable valve performance for a longer period.

Product Range

Rating Class 150# to 2500# , JIS 10K to 63K
Size 2” to 60”
Temperature 550°C, 1022°F
Type Double Offset, Triple Offset
Seat leakage ANSI Class VI, API 598
Design Code API609, ASMEB16.5, ASME B 16.10, ASME B16.34, ISO5752, MSS-SP68

Centering Guide

The QF series centering guide ensures that the disc position is firmly maintained at the center to prevent unbalanced loads to the sheet when fully closed. This seal supports long-term and reliable performance at the wetted parts. Not only does it maintain the disc position, but this collar also gives lower torque, lower friction, and long life service by holding the trim part well. In other words, this part prevents damage to the disc and seat by dispersing power.

Various Special Materials

A wide range of special materials can be selected in accordance with the fluid and pipeline conditions: titanium, Hastelloy, Inconel, Incolloy, Duplex, Monel, zirconium, and other exotic materials.

Fire-Safe Design (API 607 6th Edition)

Qublock butterfly valves are designed in accordance with the API 607 6th edition. All parts for fire-safe design are designed with two phases: gasket and metal-to-metal. If the Teflon seat is burned away, the backup metal-seat maintains the seal performance after a fire. Despite metal-to-metal contact for the valve, the QF series prevents leaking under API607 standards and protects against hazards.

Long Bearings

Qublock bearings provide minimum friction during shaft rotation, long-term sealing performance, and stable operating torque. To improve the reliability of valve operation under high pressure and temperature as well as other exotic conditions, RPTFE, carbon, or metal long bearings can be applied as options depending on the fluid conditions.