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Locked in liner

The melt processable PFA or FEP liner is locked into cast grooves, machined dovetails, slots and cast holes in the body, tail, and ball castings. This helps prevent liner collapse or blow out in vacuum and high pressure applications in conjunction with high temperature.

ANSI B16.10 face-to-face

Having standard take out dimensions allows these valves to replace any standard ball valve. It also can replace another type of valve if that valve does not meet operating requirements.

Low torque

The ball is in contact with a much smaller surface (seats) unlike the plug valve. Consequently, the operating torque is much lower. Handles are shorter making installation in compact areas possible. Actuation packages are much smaller and hence less expensive.

Metal-to-metal body joint

There is a soft joint between the body and tail which is the primary seal. However, there is also a metal-to-metal body joint which prevents possible body joint leakage from temperature changes or pipeline stresses. Overtightening of body bolts does not damage the body seal.

Separate ball and stem

The lined ball and stem are two separate parts which allow the ball to float. In case of high pressure conditions a single piece ball and stem, which some competitors use, side loads the stem packing creating stem leaks. The 911/944 design prevents this from occurring.

Pre-loaded seats

True floating ball designs do not seal well at low pressures. The 911 and 944 valves have an interference between the ball and the seats which results in a tight shut-off even when line pressure is low.