Locked in liner
The melt processible PFA liner for this lined ball valve 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 most other types of valves if that valve does not meet operating requirements.
Low torque
Unlike the plug valve, the ball in this valve is in contact with a much smaller surface (seats). 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 of this lined ball valve, 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 of a single peice ball and stem, there are side loads in the stem packing that create stem leaks. Xomox ball valves do have have his problem. Our 911/944 design prevents this from occuring.
Pre-loaded seats
True floating ball designs do not seal well at low pressures. The 911 and 944 lined ball valves have an interference between the ball and the seat which results in a tight shut-off even when line pressure is low.
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