Floating Ball Valve

QS Valve: Fujian Floating Ball Valve

Floating ball valve, 1/2 to 8 inch and 150LB to 1500LB, where line pressure pushes the ball into the downstream seat for a tight seal.

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One-Minute Overview

Floating ball valve where line pressure pushes the ball onto the downstream seat for tight shutoff.
Sizes 1/2 to 8 inch, pressure classes 150LB to 1500LB to API 608.
Quarter-turn handle gives clear open or shut feedback in one motion.
PTFE seats keep operating torque low and suit water, oil, gas and chemicals.

A floating ball valve is the everyday quarter-turn valve of plant piping. The ball has no trunnion; it floats between two seats, and line pressure on the upstream side pushes it against the downstream seat so the seal tightens as pressure rises. That simple arrangement gives tight shutoff, quick operation and low maintenance, which is why floating ball valves handle everything from utility water to chemical lines in sizes up to about 8 inch.

Name: Floating Ball Valve
Type: Floating Ball Valve
Size: 1/2-8 Inch
Class: 150LB-1500LB
Material: A105, WCB, F304, F316
Standard: API 608, ASME B16.34
Connection: Flanged RF or Threaded
Feature: Floating ball with PTFE seats and blowout proof stem

The seat material sets the temperature and chemical envelope, so check PTFE limits before ordering for steam or hot solvents. Full bore valves keep pressure drop negligible and allow pigging; reduced bore is cheaper and usually fine for isolation duty. Install with the pipeline supported and the valve free of flange strain, keep the handle clear so it cannot be knocked, and set it so the stem stands upright when open if space allows, which makes the position readable from a distance.

Seats are wear parts: when the valve starts passing at low pressure, the usual fix is a seat kit rather than a new valve, and most floating designs are rebuilt in place. Blow down the line before opening the body, replace both seats and the stem seals, and reassemble to the maker's torque figures. Exercise the valve occasionally on infrequent lines so the ball does not take a set in one position. Bore size, seat material and end connection are confirmed per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. How does a floating ball achieve sealing without a trunnion?

The ball sits between two seats with a small amount of play. Line pressure on the upstream side pushes the ball toward the downstream seat, so the sealing force grows with pressure. At low pressure the seats do most of the work; at high pressure the ball adds to it.

Q2. How do I know the seats are done and it is time for a kit?

When the valve starts passing at low pressure while holding fine at high pressure, the seats are usually the problem. A seat kit with both rings and stem seals restores tight shutoff on most floating designs, and the work is done in place without cutting the valve out.

Q3. My valve weeps a little at low pressure - is it tired or just dramatic?

Mostly dramatic, but worth listening to. Soft seats lose memory after long periods in one position, so a weep at low pressure is the classic symptom. Exercise the valve periodically, and if the weep persists, fit a seat kit before the leak starts doing any real damage.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Valves made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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