Plug Valve

QS Valve: Quanzhou Plug Valve

Steel plug valve, 1/2 to 24 inch and 150LB to 2500LB, with a tapered plug and PTFE sleeve that gives tight quarter-turn shutoff on difficult media.

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One-Minute Overview

Quarter-turn plug valve that gives tight shutoff on oil, gas, chemical and slurry lines.
Sizes 1/2 to 24 inch, pressure classes 150LB to 2500LB to API 599.
The plug wipes the seat clean as it turns, so solids do not sit on the sealing line.
Sleeve sealing keeps operating torque low and allows in-line maintenance of the stem.

A plug valve closes a pipeline with a tapered or cylindrical plug that turns a quarter of a rotation inside the body. The sealing line is wide and the plug wipes across the seat every time it moves, which is why this valve handles media that carry solids, wax or slurry without scuffing a delicate sealing edge. The result is a simple, rugged shutoff that opens and closes fast, and that can be maintained without removing the valve from the line.

Name: Plug Valve
Type: Plug Valve
Size: 1/2-24 Inch
Class: 150LB-2500LB
Material: WCB, LCC, CF8, CF8M
Standard: API 599, ASME B16.34
Connection: Flanged RF or Threaded
Feature: Tapered plug with PTFE sleeve and tight shutoff

Selection comes down to the medium and the cycle rate. PTFE sleeves suit clean hydrocarbons, chemicals and gases; where the media are abrasive or very hot, a lubricated metal-to-metal design is the better answer. Match the class to the pipeline design pressure and check the temperature limit of the sleeve before ordering. Install with the plug in the open position so the body is not under stress from the pipe, keep the line supported, and make sure the handle or gear has clear room to turn through its full quarter.

Operation is fast, which is exactly why plug valves end up on manifolds: one motion, full bore, positive feedback at the handle. If torque climbs over time, the sleeve is usually the reason and can be replaced through the body opening on most designs. Lubricate the plug on lubricated types on the schedule the maker states, and exercise the valve regularly so it does not seize in one position. Plug material, sleeve grade and end connection are confirmed per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. When is a plug valve a better choice than a ball valve?

When the medium carries solids, wax or slurry, and when the valve must wipe its seat clean on every stroke. The plug sweeps across the sealing line, so particles cannot sit and score it. Fast quarter-turn operation and simple in-line maintenance make plug valves a natural fit for manifolds.

Q2. Do I need the lubricated kind, or is the sleeved one enough for my line?

The sleeved type handles clean hydrocarbons, chemicals and gases at moderate temperature with very low torque. Move to a lubricated metal-to-metal plug when the media are abrasive, very hot, or the valve stays in one position for months and must still break free on demand.

Q3. The handle has gone stiff on me - is the valve on strike?

It is not on strike; it is asking for attention. Rising torque usually means the sleeve is wearing or the plug is dry. Check the lubrication schedule on lubricated types, and on sleeved designs plan for a sleeve replacement through the body opening. Forcing a stiff handle only makes the bill bigger.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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