Pressure Seal Bonnet Gate Valve Design Standards

Type of wedge Flexible, solid
Construction Bolted, welded, extended
End connections Flanged, BW, SW, THR, HUB, PE
Operated Handwheel, gear, bare stem, actuator
Options Extended bonnet, bellow sealed, Heating Jacket, DBB configuration
Bellow seal materials 304 - 321 - 316Ti - Alloy 625 - C276
Design & testing All available international standards according to API - EN - ISO

Size and pressure ranges

  • Size and bore:
    - ANSI 1/2” - 12”
    - DN 10 - DN 300
  • Pressure range:
    - ANSI 125 lbs - 4500 lbs
    - DIN PN 10 - PN 400
  • Temperature range:
    - minus 196 ºC up to 816 ºC
    - minus 320 °F up to 1,500 °F

Pressure seal bonnet and Hard Facing Disc

Pressure Seal Bonnet

Reliable and simple design principles, Red Point’s pressure seal bonnet (PSB) has proven its capability to handle increasingly demanding applications. PSB valve designs weigh significantly less compared to bolted bonnet designs (BB). BB design body flange and bonnet flange are joined by studs/nuts and a gasket inserted between the faces to seal. Studs/nuts are tightened to prescribed torques to affect optimal sealing. When a system pressure increases a potential leak through body/bonnet joint increases. Our pressure seal design is equipped with bonnet lift-up bolts (live-loading type) to pull the bonnet up and seal against the pressure seal gasket. This creates sealing between gasket and ID of the valve body, our segmented thrust ring maintains the load. When system pressure builds-up, so does the load in the bonnet and pressure seal gasket. System pressure increases, potential leak through body/bonnet joint decreases. The minimum consistent operating pressure is in excess of 525psi.


Hard Facing Disc

Wedge and seats are ground and lapped to a mirror finish and tightly guided to prevent dragging and seat damage.
Body and bonnet joint accurately machined with high surface finish stem and packing chamber.
Low emission valve technology with a design optimized for extended service life.
Low compression packing reduces friction and allows more room to re-torque in the field.
Packing ring construction for excellent sealing and a corrosion inhibitor.
Option: live loaded gland bolting
Lantern ring with double packing (upper & lower) for critical services

Applications for Pressure Seal Bonnet Gate Valves

Red Point’s pressure seal bonnet gate valves can be deployed for a wide variety of applications in the oil & gas and (petro)chemical industries when high quality and highly reliable valves are required. A few example applications include:

• High-temperature services
• High-cycle and switching services
• Emergency shutdown valves (ESDV)
• High-integrity pressure protection system (HIPPS)
• High-pressure oxygen, nitrogen or hydrogen
• Solids handling (powders, fines, dust and catalysts)
• Polyethylene or polypropylene
• Coal conversion and gasification
• Thermal fluids
• Separator, filter and drying systems
• Compressor stations
• On/off isolation service
• Oil and gas manifolds

Body Material

Commonly used body materials




– Nickel Alloys (Monel®, Inconel®, Hastelloy®, Incoloy®)
– Duplex and Super Duplex
– Carbon steel and low temp carbon steel
– Low alloy steel
– Stainles steel
– Titanium
– Zirconium

View all materials

Get a quote today

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