API · ASME · DIN · EN standard industrial valves
Plug Valves
Quarter-turn valves with a cylindrical or tapered plug for fast isolation, diverting and dirty-media duty.
Last updated: 2026-11
Family specifications
| designs | Lubricated, Non-Lubricated Sleeved, Jacketed, 3-Way, Eccentric, Orbit, Twin Seal, Connection Lift |
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| body materials | WCB (ASTM A216), LCB, LCC (ASTM A352), F11, F22 (ASTM A182), CF8, CF8M (ASTM A351), F316, F316L (ASTM A182), F51/2205 duplex (ASTM A182), F53, F55/2507 super duplex (ASTM A182), C95400, C95800 aluminium bronze (ASTM B148), nickel-chromium alloy 625, nickel-molybdenum alloy C276 (ASTM B564) |
| design focus | Plug and body surface finish, contact pressure and sealing stability, operating torque limits, wear under cycling, structural integrity under pressure |
| operation | Quarter-turn |
| diverting ports | 3-Way multi-port diverting and mixing |
| size range | DN15 to DN600 |
| pressure class | ANSI Class 150 to Class 2500, PN10 to PN420 |
| temperature range | -29 to 425°C (seat/packing dependent) |
| end connections | RF, NPT, BW, SW |
| design standards | API 599, API 6D, ASME B16.34, BS 5353 |
| testing standards | API 598, API 6D, ISO 5208 |
| sealant functions | Drop-Tight Seal, Lubrication, Renewable Seat, Plug-Jacking |
| lubricant temperature grading example | 50-650 F (10-343 C) stick-grade sealant example |
| sleeved seat envelope | PTFE sleeved approx. -20 to 200 C, up to 40 bar (600 psi) |
| eccentric seat action | 20-30 degree offset between plug and seat; cam-action lift before rotation minimizes seat rubbing |
| fire testing standards | API 607, API 6FA |
| ptfe sleeve temp ceiling | Standard PTFE sleeve limits service to about 200°C max; sleeved plug valves are unsuitable for high-temperature steam or heavy hydrocarbon service where PTFE would degrade |
| ptfe sleeve sealing mechanism | Bubble-tight zero-leakage sealing; self-lubricating sleeve reduces wear and friction; smooth non-stick lining prevents buildup of scale, debris, or chemical residues |
| lubricated in line resealing | Lubricated plug valves can be resealed and recovered in service without removal from the line |
| eccentric leakage and direction | Eccentric plug valves seal in both flow directions; soft-seated eccentric valves often achieve ISO 5208 Class VI leakage |
| eccentric slurry wear mechanism | Cam-away opening action prevents abrasive media from cutting grooves in the seat as the plug rotates; eccentric plugs are used in severe sewage service (DN100–DN600) |
| low emission certification | Low-emission sleeved plug valves certified to ISO 15848-1 / TA-Luft 2021 exist (e.g. XOMOX sleeved plug valves passed four thermal cycles without packing adjustment, BH CO3 200°C SSA0) |
| sour service materials standard | NACE MR0175 / ISO 15156 for sour (H2S-containing) oil & gas service; MR0103 governs refinery (downstream) sour service |
| sour service hardness limit | Carbon and low-alloy steel pressure-containing parts (body, bonnet, end flanges) max 22 HRC (237 HBW, 248 HV10) for NACE MR0175 compliance |
| sour service h2s threshold | H2S partial pressure exceeding 0.0003 MPa (0.05 psi) in a multiphase system with free water present defines sour service |
| sour service fire safe | Fire-safe design to API 607 required for plug valves (with ball and butterfly valves) in sour flammable service |
| sour service trim note | Standard bearing balls and 440C trim are not permitted in sour valves; cobalt-chromium hardfacing alloy 6 hardfacing is permitted |
| eccentric size range large diameter | 0.5 - 72 in (15 - 1800 mm) (DeZURIK PEC/PEF eccentric plug valves) |
| eccentric temperature ceiling | 450 F (232 C) (DeZURIK PEC/PEF) |
| eccentric shutoff class | Resilient plug facing: drip tight; metal plug: equal to ANSI/FCI 70-2 Class IV (DeZURIK PEC/PEF) |
| eccentric port area options | 100% of standard pipe area where highest flow is required (pumped systems); 70/80% area for non-pumped (gravity feed) systems; straight-through body maximizes flow capacity and reduces head loss (DeZURIK PEC/PEF) |
| eccentric pressure rating pec pef | PEC: cast iron 0.5-12 in 175 psi (15-300mm 1210 kPa), 14-72 in 150 psi (350-1800mm 1035 kPa); ductile iron 0.5-12 in 285 psi (1965 kPa), 14-72 in 250 psi (1724 kPa); special 450 psi (3100 kPa). PEF: cast iron or ductile iron 3-12 in 175 psi, 14-36 in 150 psi. |
| eccentric rectangular port seating | Quarter-turn eccentric action with resilient plug facings; the plug moves eccentrically into a raised eccentric seat without scraping the seat or body walls, and the rectangular port provides wide tolerance seating geometry for lasting shutoff (DeZURIK PEC/PEF) |
Scope & source notes
| eccentric size range inconsistency | Eccentric size-range inconsistency: generic sources cap plug valves at DN15-DN600 (1/2"-24") while DeZURIK publishes the PEC/PEF eccentric execution to 72 in (DN1800); kept generic field unchanged, execution-specific range recorded separately. |
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Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What standards govern the design and testing of plug valves?
The published specification for this family lists API 599, API 6D, ASME B16.34, BS 5353 as the design standards. Testing follows API 598, API 6D, ISO 5208.
What sizes and pressure ratings are available for plug valves?
The published size range is DN15 to DN600, and the published pressure ratings are ANSI Class 150 to Class 2500, PN10 to PN420. Availability of a specific size and rating is confirmed at quotation.
What materials are plug valves available in?
The published specification lists body materials: WCB (ASTM A216), LCB, LCC (ASTM A352), F11, F22 (ASTM A182), CF8, CF8M (ASTM A351), F316, F316L (ASTM A182), F51/2205 duplex (ASTM A182), F53, F55/2507 super duplex (ASTM A182), C95400, C95800 aluminium bronze (ASTM B148), nickel-chromium alloy 625, nickel-molybdenum alloy C276 (ASTM B564). Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do plug valves cover?
The published working temperature range is -29 to 425°C (seat/packing dependent). For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What end connections do plug valves support?
The published specification lists RF, NPT, BW, SW as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for plug valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
Types in this family
Type
Lubricated Plug Valves
Lubricated plug valves keep a waxed seal between plug and body: injected grease compounds follow the sealing faces, cutting operating torque and letting a taper
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Sleeved Plug Valves
Sleeved plug valves seat a tapered plug inside a compression sleeve — typically PTFE-based — that laps against the plug face and keeps the line sealed without i
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Jacketed Plug Valves
Jacketed plug valves carry a heating jacket over the valve body so line steam or thermal fluid can hold waxy, freezing or heat-sensitive media above their pour
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3-Way Plug Valves
Three-way plug valves port two inlets and one outlet (or the reverse) through a single plug, so a diverging or converging flow switch happens at the valve inste
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Eccentric Plug Valves
Eccentric plug valves swing a rounded plug into an offset seat, camming it firmly against the face only in the closed position — so the seat wipes rather than s
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Orbit Plug Valves
Orbit plug valves lift the plug off the seat before rotating it, so the sealing faces rub only through the last fraction of travel — the rolling-and-cambering m
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Twin Seal Plug Valves
Twin seal plug valves wrap a PTFE sleeve seal around the plug so two sealing lands bear on the body at once — a double-direction, zero-leakage shut-off on pipel
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Four-Way Plug Valves
Four-way plug valves turn a multiple-port plug through 90° to divert flow between four pipe connections in one valve — throttling and diverting service that wou
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