Stem seal stops ball valve leaks

Oct. 25, 2001
A common problem in ball valves is a misaligned actuator.


A common problem in ball valves is a misaligned actuator. If someone steps on the valve or bumps it in the field, or just opens or closes the valve roughly, it could put a side load on the stem and lead to leakage. To prevent this, engineers at Xomox Corp., Cincinnati, designed a spherical seal on its Tuffline ball valve that handles side loads without leaking. It works somewhat like a ball joint to maintain stem seal integrity despite stem movements and wear on sealing components. The precisely machined ball also assures low operating torque for economical actuation and reduced seat wear.

The valves are available in one and two-piece flanged versions, as well as three-piece screwed, socket-welded, and butt-welded versions. Sizes range from 0.5 through 8 in. in ANSI class pressure ratings of 150, 300, and 600 psi. They provide tight shutoff from high vacuum through rated pressures at temperatures of -20 to 450F.

Sponsored Recommendations

Drive systems for urban air mobility

March 18, 2025
The shift of some of our transport traffic from the road to the air through urban air mobility is one of the most exciting future fields in the aerospace industry.

Blazing the trail for flying robots

March 18, 2025
Eight Bachelor students built a flying manipulator that can hover in any orientation and grasp objects. The drone is even more maneuverable than a quadrocopter and was designed...

Reachy 2: The Open-Source Humanoid Robot Redefining Human-Machine Interaction

March 18, 2025
Reachy 2 was designed to adapt to a wide variety of uses thanks to its modular architecture.

maxon IDX: The plug-and-play solution

March 18, 2025
IDX drives combine power with small space requirements - a brushless BLDC motor combined with an EPOS4 positioning controller and a gearhead inside a high-quality industrial housing...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!