Pressure Seal Valve Manufacturer & Exporter

Pressure seal bonnet gate, globe, and check valve manufacturer in India. Class 600 to 2500. WCB, WC6, WC9, CF8M. For power plants, refineries, high-pressure steam. API 600 certified. Export worldwide.

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What is a Pressure Seal Valve?

A pressure seal valve uses internal pressure to enhance the body-bonnet seal — as internal pressure increases, the sealing force increases proportionally. Unlike bolted-bonnet designs where gasket loading decreases with temperature cycling, pressure seal bonnets become tighter at higher pressures. This makes them the standard choice for high-pressure, high-temperature service in power generation, refining, and petrochemical plants.

Pressure Seal Valve Specifications

ParameterSpecification
Body MaterialsASTM A216 WCB, A217 WC6/WC9, A351 CF8M, A352 LCB/LCC
Trim MaterialsStellite 6 overlay, 13Cr, Inconel 625 overlay
Size Range2" to 24" (DN50 to DN600)
Pressure ClassClass 600, 900, 1500, 2500
End ConnectionsButt Weld, Flanged RTJ
Design StandardsAPI 600, ASME B16.34, BS 1873
TestingAPI 598, BS EN 12266-1
Temperature Range-29°C to 593°C (WC6/WC9 for high temp)

Pressure Seal Valve Types

Pressure Seal Gate Valve (Wedge & Parallel Slide)
Pressure Seal Globe Valve (Straight & Y-Pattern)
Pressure Seal Check Valve (Swing & Tilting Disc)
Pressure Seal Y-Pattern Globe Valve
Motor Operated Pressure Seal Valves
Gear Operated Pressure Seal Valves

Applications

Thermal power plants — main steam & reheat
Nuclear power plants
Petroleum refineries — high-pressure units
Petrochemical crackers & reformers
LNG & gas processing
High-pressure boiler systems
Supercritical steam applications

Frequently Asked Questions

When should I use pressure seal vs bolted bonnet valves?
Pressure seal bonnets are recommended for Class 600 and above (typically mandatory from Class 900). Below Class 600, bolted bonnet is standard and more economical. The crossover point depends on size and temperature — for high-temperature service (>400°C), pressure seal may be preferred even in Class 600.
What is the maximum temperature for pressure seal valves?
WCB bodies: up to 425°C. WC6 (1.25Cr-0.5Mo): up to 540°C. WC9 (2.25Cr-1Mo): up to 593°C. For supercritical applications, F91/F92 grades handle up to 620°C. All with Stellite 6 trim for high-temperature erosion resistance.
Do you manufacture pressure seal valves for power plants?
Yes. Power plant valves are our core strength. We supply pressure seal gate, globe, and check valves for main steam, hot reheat, cold reheat, feed water, and extraction lines. Available with MOV/gear operators, bypass valves, and drain connections per power plant specifications.
Can pressure seal valves be supplied with NACE compliance?
Yes. We manufacture NACE MR0175 compliant pressure seal valves in LCB/LCC bodies with controlled hardness (≤22 HRC) for sour gas service in high-pressure upstream oil & gas applications.

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