Gate Valves

Gate valves across 44,145 listed configurations — solid and flexible wedge, parallel slide, resilient-seated and cryogenic — DN15–DN600, ASME 150–2500. Compare options and submit an RFQ on Himalay.

Sourcing at a Glance

HS Code(s)

8481.80 (six-digit; 8-digit ITC-HS pending CHA confirmation)

MOQ Range

Quoted per order

Sample Lead Time

Quoted per order

Production Lead Time

Quoted per order

FOB Basis

Quoted per order

Standards / Certifications

API 600, ASME B16.34, IS 14846, EN 1171, EN 1984, AWWA C509/C515, BS 6364, ISO 28921

Specifying Gate Valves: Wedge Type, Trim, Class and Stem

Where gate valves fit. A gate valve isolates; it does not throttle. Partially open, the gate vibrates against the flow and erodes — so specify a globe valve for regulation and a gate valve where the line is either open or shut. In the open position the full-bore path gives very low pressure drop — comparable to a full-bore ball valve and far below globe or check designs — which is why transmission lines, plant block valves and utility isolation default to gates.

The five catalogue families. Solid wedge covers general isolation across the widest class span, PN6 through ASME 2500. Flexible wedge — ASME 300–2500 — prevents thermal binding where lines cycle. Parallel slide — ASME 600–2500 — is the high-pressure steam design, sealing by line pressure against the downstream seat rather than by wedging. Resilient-seated valves serve water and utility duty at ASME 125/150 patterns. Cryogenic extended-bonnet valves, ASME 150–600, keep the stem packing away from the cold zone.

Specification checklist. Seven hard points: service medium; nominal size; pressure class; face-to-face standard; end connection; body material grade; trim. Add stem arrangement (rising OS&Y or non-rising), operation (handwheel, gear, bare stem, electric — listed options) and, for automated valves, fail-safe mode and torque.

Size and class coverage. DN15–DN600 across 44,145 configurations. Class ceilings differ by family — the full ASME 900–2500 range is carried by solid wedge, flexible wedge and parallel slide types; resilient-seated stops at ASME 125/150.

Materials against service. WCB/WCC carbon steel is the process default. Low-temperature lines below −29 °C take A352 LCB/LCC — that figure is the conventional Charpy threshold. High-temperature steam and refinery services step up through A217 WC6 and WC9 above roughly 425 °C, and C12A (P91) above roughly 550 °C. Corrosive services select across CF8M/CF3M stainless, duplex 2205, Alloy 20, Monel 400, Hastelloy C276, titanium Gr 2, aluminium bronze and 6Mo — all listed grades. Waterworks lines run cast or ductile iron with EPDM-encapsulated wedges.

Trim selection. Trim decides sealing life: 13Cr (Trim 1) is the economical steel-service default; SS316 (Trim 10/12) covers corrosive duty; stellite-hardfaced seats (Trim 5) handle temperature and wear; bronze/SS410 seat rings serve iron-bodied water valves. Trim and body must be chosen together against medium and temperature — state both in the enquiry.

Standards map. API 600 governs heavy-duty bolted-bonnet steel gate valves for petroleum service — full port, heavy wall sections, large stem diameters — across NPS 1–42 and Classes 150–2500, flanged or butt-weld ends. ASME B16.34 supplies the pressure-temperature ratings behind every class figure. Waterworks valves follow IS 14846/EN 1171 (Indian/European water gate valves) and AWWA C509/C515 (resilient-seated, standard and reduced-wall). Cryogenic valves reference BS 6364/ISO 28921 for low-temperature testing. EN 1984 covers European steel gate valves generally.

Import conformity. EU: PED 2014/68/EU category and module, CE marking, EN 10204 3.1 certificates. Saudi Arabia: SABER. UAE: ECAS. Sour service: NACE MR0175 on all wetted parts. Pressure and seat testing follows API 598 test pressures — a failed hydrostatic test is an automatic rejection.

From spec to RFQ. A complete gate-valve enquiry states: medium, DN/NPS, class, face-to-face, ends, body grade, trim, stem arrangement, operation, destination market, and any low-temperature, high-temperature or sour-service condition. Share the line spec or datasheet with your RFQ and the configuration is matched against the catalogue directly.

How Gate Valves Work

Mechanism: a gate lifted clear of the bore, not throttled across it. A gate valve differs from quarter-turn designs "in that the closure element, called the disc, gate, or obturator, rises on the base of a stem or spindle out of the waterway and into the valve top, called the bonnet, by means of multiple turns of the spindle or stem." Because the gate lifts clear rather than rotating into the flow, "an open gate valve offers about the same amount of resistance to flow as a section of pipe of the same port size" — which is also why "gate valves are generally bad choices for regulating flow or operating in any orientation other than fully open or fully closed." The catalogue's solid- and flexible-wedge families close on the classic wedge principle: "the slightly angled disc mating with the same angled valve body seats" affects "a tight closure," seated "by applying torque to push the disc firmly into the seats." Stem arrangement is the other mechanical choice — "the motion of a gate valve's disc upon the stem dictates whether the stem rises during opening or threads into the disc," defining rising-stem and non-rising-stem (NRS) styles, with the outside-screw-and-yoke (OS&Y) rising-stem version "preferred for corrosive environments because the threads are outside the fluid containment area."

Industries served: petroleum pipelines and refining, where full bore and toughness outweigh cost. Gate valves remain standard on many crude and product pipelines: one US pipeline maintenance specialist reports "we use slab gate valves for most of our main line valves" on lines carrying "gasoline, distillates, diesel fuel and other finished petroleum products," with "expanding gate valves for station isolation valves and pig launchers" chosen specifically because "pig launcher and receiver service is harder on valves... so we choose expanding gates because of their toughness." The same source distinguishes those pipeline-pattern gates from "the wedge-type gate valves common in the downstream petrochemical and refining industries" — the catalogue's own solid- and flexible-wedge families. Quarter-turn ball valves have since taken most gas-pipeline share on cost and delivery grounds — "in many natural gas pipeline operations, quarter-turn has taken over 100%," per one pipeline-industry sales engineer quoted in the same piece — but gate valves persist wherever full-bore isolation and robustness outweigh price.

Standards landscape: a heavy-duty petroleum-refinery specification, and the pressure-temperature tables behind every class figure. API 600 "specifies the requirements for a heavy-duty series of bolted bonnet steel gate valves for petroleum refinery and related applications," aimed at services "where corrosion, erosion, and other service conditions would indicate a need for full port openings, heavy wall sections, and large stem diameters," across sizes DN 25 to DN 1050 and Classes 150 to 2500. ASME B16.34 supplies the ratings behind those class numbers: "the pressure class is a guideline and dimensionless number to define the pressure and temperature values at which valves of any type of valve can operate," and because "the operating pressure should be reduced as the operating temperature increases," a Class 150 valve is rated between −29 °C and 270 °C while Class 300 and above extends to 454 °C. These are the same class figures already listed against catalogue SKUs. Sources: [Valve Magazine — The Fundamentals of Gate Valves](https://valvemagazine.com/articles/the-fundamentals-of-gate-valves/); [Valve Magazine — Pipeline Valves—Always Ready](https://valvemagazine.com/articles/where-valves-are-used-pipeline-valvesalways-ready/); [ReliaValves — API 600](https://www.reliavalves.com/api-standard/api-600); [wermac.org — ASME B16.34 Valve Pressure Classes](https://www.wermac.org/valves/valves_B16_34.html)

Frequently Asked Questions

What does OS&Y mean, and do I need a rising-stem gate valve?

OS&Y (outside screw and yoke) means the stem threads are outside the pressure boundary, in a yoke above the bonnet, so the stem rises as the valve opens — giving clear visual open/closed indication and keeping threads away from the process fluid. It is the conventional arrangement on heavy-duty bolted-bonnet refinery-class gate valves. API 600 governs those valves' bolted-bonnet construction, size range and class range. Non-rising-stem designs suit buried or height-restricted installations; state the stem arrangement in the RFQ, along with stem extension length where the valve is buried.

Solid wedge, flexible wedge or parallel slide — which should I specify?

Solid wedge is the general-purpose choice for most isolation duty; flexible wedge adds a machined relief that lets the wedge halves flex, preventing thermal binding in services that cycle hot and cold; parallel slide uses two independent discs and is the steam-service design, listed in the catalogue up to ASME 2500. For thermal-cycling or high-temperature steam lines, state the service temperature profile in the enquiry so wedge type and body grade are matched together.

When is a resilient-seated gate valve the right choice?

Resilient-seated gate valves — an EPDM-encapsulated wedge sealing against a smooth body bore — are the standard for clean water, distribution networks and utility service, where they deliver drop-tight shutoff at low pressure without the machining costs of metal seats. Catalogue resilient-seated valves carry ASME 125/150-pattern ratings in ductile and cast iron bodies with grooved (AWWA C606) and mechanical-joint ends available for waterworks installation. They are not suited to abrasive or high-temperature media — state the medium in the RFQ.

What body and trim do I need for high-temperature service?

Above roughly 425 °C, carbon steel bodies give way to chrome-moly grades — A217 WC6 and WC9 — and above roughly 550 °C to C12A (P91); all three are listed catalogue body materials. Pair them with stellite-hardfaced Trim 5 seats for wear resistance at temperature. State maximum operating temperature and pressure together — the pair determines the class rating via the ASME B16.34 pressure-temperature tables.

Are cryogenic gate valves available?

Yes — cryogenic extended-bonnet gate valves are a listed catalogue family in ASME 150–600, referencing BS 6364/ISO 28921, in austenitic stainless bodies (CF8, CF8M, CF3M) with stellite-hardfaced Trim 5. Below −29 °C — the conventional Charpy impact threshold — low-temperature grades are specified in place of standard carbon steel. State design temperature and any BOG/LNG service detail in the enquiry.

What conformity documentation applies for EU, Saudi and UAE imports?

EU-bound pressure equipment is categorised under PED 2014/68/EU with CE marking per the applicable module; Saudi imports require SABER conformity; UAE imports require ECAS; sour hydrocarbon service invokes NACE MR0175 limits on wetted parts. EN 10204 3.1 material certificates are the standard EU procurement baseline. State the destination market in the enquiry.