API · ASME · DIN · EN standard industrial valves
Pressure Seal Gate Valves
Pressure seal gate valves use a bonnet seal that internal pressure itself tightens: above roughly Class 900 the push of the line media forces the pressure-seal gasket outward against the bonnet retainer, so sealing improves with pressure instead of degrading — the bolted-bonnet alternative cannot match this at high class. The series runs DN50 to DN400 at Class 1500 to Class 2500 in a wide material matrix (A105, F304/F316 and L grades, F51/F53 duplex, F11/F22, LCB), with cobalt-chromium hardfacing alloy-faced or stainless seats, graphite/PTFE packing, RF/RTJ/BW/SW/NPT ends and handwheel or electric operation. Testing is listed to API 598, DIN 3230, EN 12266 and ISO 5208.
Part of the Gate Valves family
Last updated: 2026-11
Family specifications
| size range | DN50 to DN400 |
|---|---|
| pressure class | Class 1500 to Class 2500 |
| pressure class | Class1500 to Class2500 |
| body materials | A105, F304, F316, F304L, F316L, F51, F53, F11, F22, LCB |
| seat materials | F6a + cobalt-chromium hardfacing alloy, SS304, SS304 + cobalt-chromium hardfacing alloy, SS316, SS304L, SS316L |
| stem materials | F6a, F304, F316, F3304L, F316L |
| end connections | RF, RTJ, BW, SW, NPT |
| operation | Handwheel operated, Electric operated |
| temperature range | -196°C to 570°C |
| design standards | API 602, BS5352, ASME B16.34 |
| design standards | API602, BS5352, ASME B16.34 |
| testing standards | API 598, DIN 3230, EN 12266, ISO 5208 |
| face to face | ANSI B16.10, DIN3202, EN558-1, EN12982, ISO 5752 |
| packing materials | Graphite, PTFE |
| kva design standards | API 600, ASME B16.34 |
| kva size range | DN80 (3 inch) to DN400 (16 inch) across collected SKUs |
| kva size upper | DN400 (16 inch) |
| kva pressure class | Class 600 (PN100) to Class 2500 LB (PN420) across collected SKUs |
| kva pressure mid | Class 600 LB (PN100) |
| kva body materials | ASTM A216 WCB, ASTM A182 F304/F92, ASTM A351 CF8/CF8C, ASTM A217 WC6/WC9/C12A, 12Cr1MoV, 20CrMoV across collected SKUs |
| kva end connections | Butt weld (BW) and RTJ flanged ends across collected SKUs |
| kva operation | Bevel gear operated on selected SKUs |
| kwb size range | 2 inches to 24 inches |
| kwb pressure class | Class 600 to Class 2500 LB |
| kwb body materials | ASTM A105N (also ASTM A105), ASTM A216 WCB across listed SKUs |
| kwb design standards | BS 5352, EN 558, API 6D across listed SKUs |
| kwc size range | 2 to 36 inch (DN50 to DN900) |
| kwc pressure class | Class 150 to 900 (PN16 to PN150) |
| kwc temperature range | -29°C to +560°C |
| kwc end connections | RF, RTJ, BW |
| kwc design standards | Cast steel gate valve to API 600 (ISO 10434), API 6D; cast stainless steel gate valve to API 603, API 600 |
| kwc testing standards | API 598, API 600 or API 6D |
| kwc flange standards | Flanges ASME B16.5 (NPS≤24) / ASME B16.47 Series A & B, API 605, MSS SP-44 (NPS＞24); BW ends ASME B16.25; face-to-face ASME B16.10; pressure-temperature ASME B16.34 |
| kwc operation | Hand wheel, gear, electric actuator, etc. |
| kwc body materials | Carbon steel, stainless steel, alloy steel |
| kwc sku configuration | 12 inch WCB SKU: full port, 900 lb working pressure, RF ends, working temp -29~425°C, gear box operated |
| kwc medium | Water, natural gas, oil and some corrosive liquid |
| yoke materials | A105, F304, F316, F304L, F316L, F51, F53, F11, F22, LCB |
| wedge materials | A105, F304, F316, F304L, F316L, F51, F53, F11, F22, LCB |
| gland materials | F6a, F304, F316, F3304L, F316L |
| seat ring materials | F6a+cobalt-chromium hardfacing alloy, SS304, SS304+cobalt-chromium hardfacing alloy, SS304, SS316, SS304L, SS316L |
| packing | Graphite, PTFE |
| gasket | SS304+ Graphite, SS316+Graphite |
| socketweld dimension | ANSI B16.11, JIS B2306 |
| buttweld dimension | ASME B16.25, DIN 3239, EN12627 |
| screwed dimension | ANSI B1.20.1 |
| end to end | ANSI B16.5, EN1092, DIN2543, DIN2547 |
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 pressure seal gate valves?
The published specification for this family lists API 602, BS5352, ASME B16.34 as the design standards. Testing follows API 598, DIN 3230, EN 12266, ISO 5208.
What sizes and pressure ratings are available for pressure seal gate valves?
The published size range is DN50 to DN400, and the published pressure ratings are Class 1500 to Class 2500. Availability of a specific size and rating is confirmed at quotation.
What materials are pressure seal gate valves available in?
The published specification lists body materials: A105, F304, F316, F304L, F316L, F51, F53, F11, F22, LCB. Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do pressure seal gate valves cover?
The published working temperature range is -196°C to 570°C. 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 pressure seal gate valves support?
The published specification lists RF, RTJ, BW, SW, NPT as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for pressure seal gate 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.
Knowledge: selection guides
Request a quote for pressure seal gate valves
Submit the requirement here — a quotation-ready inquiry states the governing standard and class, size, materials, medium, temperature and destination.
What happens to your details is described in our privacy notice.
Get a quotation for Pressure Seal Gate Valves
Send the standard, pressure class and size for a quotation-ready inquiry — answered with documents and terms.