Ball Valve News & Technical Insights from J-VALVES

A ball valve datasheet only works when six blocks are fixed: pressure basis, bore, temperature ceiling, test, end connection, operator. How each is written.

The valve that stopped a gasifier train was an 8 inch Class 900 ball valve on the black water letdown, seven months into service. It had not leaked. It had stopped turning. The actuator was delivering its rated torque, the stem was intact, and the ball would not move more than a few degrees. When th

A 20 inch Class 600 ball valve on a natural gas export line developed a seat leak that measured 300 parts per million by volume on the ultrasonic meter at the downstream flange. The leak was not a safety emergency and it was not going to be fixed by anything short of a shutdown, which was fourteen m

Torque signatures, acoustic emission, differential pressure and digital twin residuals: which measurements find a failing ball valve early.

Why SWRO high pressure valves fail early: recovery arithmetic, crevice temperature, ERD ripple, scale, letdown cavitation and surge.

A ball valve can pass a hydrostatic seat test and still leak gas. Why air and water prove different things, and how to read a bubble, decay or helium test.

A weeping flange is rarely the gasket. Preload, torque scatter, hardness limits and thermal relaxation decide whether the joint holds at 100 bar and 400 C.

A bypass around a ball valve does four different jobs. Why equalizing protects the seat, where to tap in, and why an open bypass is a leak path.

A fixed ball still stands on bearings. The thrust path from ball to body, why rolling elements are wrong here, and four symptoms that name a bearing fault.

Zone, EPL, gas group and T class decide the actuator on a ball valve, not the body. How the assembly is certified, wired and earthed in an Ex area.