Gresswell G55
Gresswell G55 General Purpose Pressure Relief Valves

Gresswell G55 General Purpose Pressure Relief Valves

Code: G55-M-15-A
  • Full Cat IV PED approval
  • Only 4 springs are needed to cover the full pressure range
  • Clear operating & maintenance instructions are supplied

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G55 Bronze safety relief valves – side outlet discharge with leak-proof dome top

These valves are commonly used to prevent safe pressure from being exceeded in pressurised systems. The lift is proportional to the system overpressure.

Particularly suitable for most liquid applications where a ‘small’ discharge often prevents the safe pressure in a system from being exceeded. Also suitable for steam, gases & vapour applications where a low discharge is suitable.

Size Range:

  • DN15-DN80 (½” – 3”)

Pressure Range:

  • 0.5 Bar.g (7 PSI) to 20.7 Bar.g (300 PSI)

Pipe Connections:

  • Male Inlet x Female Outlet.
  • Inlet: Threaded ‘G’ BSP Male to BS EN ISO 228/BS 2779.
  • Outlet: Threaded ‘Rp’ Parallel Female to BS 21/BS EN 10226/ISO 7.
  • Alternative thread standards, i.e. BSPT or NPT, are available upon request.
  • Flanged connections are also available. Most flange standards can be accommodated.

Features and Benefits:

  • Gresswell Valves are quality assurance approved to BS EN ISO 9001: 2015 and manufactured in accordance with BS EN ISO 4126-1 & BS6759.
  • Screwed/Flanged, or a combination of both, is available as standard.
  • See data sheets for Discharge Capacities.

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    Title Size
    G55 Datasheet 2 MB
    G55 & G90 Discharge Capabilities 142 KB

    Additional information

    Weight 0.09 kg

    Ordering Information

    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: SCREWED BSP (M) X Rp (F)
    MATERIAL: BRONZE
    SEAT MATERIAL: METAL (BRONZE)
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-M-15-A 05515-0-008-1 1/2″ 15
    G55-M-15-B 05515-0-008-2 1/2″ 15
    G55-M-15-C 05515-0-008-3 1/2″ 15
    G55-M-20-A 05520-0-008-1 3/4″ 20
    G55-M-20-B 05520-0-008-2 3/4″ 20
    G55-M-20-C 05520-0-008-3 3/4″ 20
    G55-M-25-A 05525-0-008-1 1″ 25
    G55-M-25-B 05525-0-008-2 1″ 25
    G55-M-25-C 05525-0-008-3 1″ 25
    G55-M-32-A 05532-0-008-1 1 1/4″ 32
    G55-M-32-B 05532-0-008-2 1 1/4″ 32
    G55-M-32-C 05532-0-008-3 1 1/4″ 32
    G55-M-40-A 05540-0-008-1 1 1/2″ 40
    G55-M-40-B 05540-0-008-2 1 1/2″ 40
    G55-M-40-C 05540-0-008-3 1 1/2″ 40
    G55-M-50-A 05550-0-008-1 2″ 50
    G55-M-50-B 05550-0-008-2 2″ 50
    G55-M-50-C 05550-0-008-3 2″ 50
    G55-M-65-A 05565-0-008-1 2 1/2″ 65
    G55-M-65-B 05565-0-008-2 2 1/2″ 65
    G55-M-65-C 05565-0-008-3 2 1/2″ 65
    G55-M-80-A 05580-0-008-1 3″ 80
    G55-M-80-B 05580-0-008-2 3″ 80
    G55-M-80-C 05580-0-008-3 3″ 80
    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: FLANGED PN16/PN25/ANSI150/ANSI300
    MATERIAL: BRONZE
    SEAT MATERIAL: METAL (BRONZE)
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-M-15FL[XXX]*-A 05515-0-[205/207/221/223]-1 1/2″ 15
    G55-M-15FL[XXX]*-B 05515-0-[205/207/221/223]-2 1/2″ 15
    G55-M-15FL[XXX]*-C 05515-0-[205/207/221/223]-3 1/2″ 15
    G55-M-20FL[XXX]*-A 05520-0-[205/207/221/223]-1 3/4″ 20
    G55-M-20FL[XXX]*-B 05520-0-[205/207/221/223]-2 3/4″ 20
    G55-M-20FL[XXX]*-C 05520-0-[205/207/221/223]-3 3/4″ 20
    G55-M-25FL[XXX]*-A 05525-0-[205/207/221/223]-1 1″ 25
    G55-M-25FL[XXX]*-B 05525-0-[205/207/221/223]-2 1″ 25
    G55-M-25FL[XXX]*-C 05525-0-[205/207/221/223]-3 1″ 25
    G55-M-32FL[XXX]*-A 05532-0-[205/207/221/223]-1 1 1/4″ 32
    G55-M-32FL[XXX]*-B 05532-0-[205/207/221/223]-2 1 1/4″ 32
    G55-M-32FL[XXX]*-C 05532-0-[205/207/221/223]-3 1 1/4″ 32
    G55-M-40FL[XXX]*-A 05540-0-[205/207/221/223]-1 1 1/2″ 40
    G55-M-40FL[XXX]*-B 05540-0-[205/207/221/223]-2 1 1/2″ 40
    G55-M-40FL[XXX]*-C 05540-0-[205/207/221/223]-3 1 1/2″ 40
    G55-M-50FL[XXX]*-A 05550-0-[205/207/221/223]-1 2″ 50
    G55-M-50FL[XXX]*-B 05550-0-[205/207/221/223]-2 2″ 50
    G55-M-50FL[XXX]*-C 05550-0-[205/207/221/223]-3 2″ 50
    G55-M-65FL[XXX]*-A 05565-0-[205/207/221/223]-1 2 1/2″ 65
    G55-M-65FL[XXX]*-B 05565-0-[205/207/221/223]-2 2 1/2″ 65
    G55-M-65FL[XXX]*-C 05565-0-[205/207/221/223]-3 2 1/2″ 65
    G55-M-80FL[XXX]*-A 05580-0-[205/207/221/223]-1 3″ 80
    G55-M-80FL[XXX]*-B 05580-0-[205/207/221/223]-2 3″ 80
    G55-M-80FL[XXX]*-C 05580-0-[205/207/221/223]-3 3″ 80
    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: SCREWED BSP (M) X Rp (F)
    MATERIAL: BRONZE
    SEAT MATERIAL: PTFE
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-T-15-A 05515-2-008-1 1/2″ 15
    G55-T-15-B 05515-2-008-2 1/2″ 15
    G55-T-15-C 05515-2-008-3 1/2″ 15
    G55-T-20-A 05520-2-008-1 3/4″ 20
    G55-T-20-B 05520-2-008-2 3/4″ 20
    G55-T-20-C 05520-2-008-3 3/4″ 20
    G55-T-25-A 05525-2-008-1 1″ 25
    G55-T-25-B 05525-2-008-2 1″ 25
    G55-T-25-C 05525-2-008-3 1″ 25
    G55-T-32-A 05532-2-008-1 1 1/4″ 32
    G55-T-32-B 05532-2-008-2 1 1/4″ 32
    G55-T-32-C 05532-2-008-3 1 1/4″ 32
    G55-T-40-A 05540-2-008-1 1 1/2″ 40
    G55-T-40-B 05540-2-008-2 1 1/2″ 40
    G55-T-40-C 05540-2-008-3 1 1/2″ 40
    G55-T-50-A 05550-2-008-1 2″ 50
    G55-T-50-B 05550-2-008-2 2″ 50
    G55-T-50-C 05550-2-008-3 2″ 50
    G55-T-65-A 05565-2-008-1 2 1/2″ 65
    G55-T-65-B 05565-2-008-2 2 1/2″ 65
    G55-T-65-C 05565-2-008-3 2 1/2″ 65
    G55-T-80-A 05580-2-008-1 3″ 80
    G55-T-80-B 05580-2-008-2 3″ 80
    G55-T-80-C 05580-2-008-3 3″ 80
    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: FLANGED PN16/PN25/ANSI150/ANSI300
    MATERIAL: BRONZE
    SEAT MATERIAL: PTFE
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-T-15FL[XXX]*-A 05515-2-[205/207/221/223]-1 1/2″ 15
    G55-T-15FL[XXX]*-B 05515-2-[205/207/221/223]-2 1/2″ 15
    G55-T-15FL[XXX]*-C 05515-2-[205/207/221/223]-3 1/2″ 15
    G55-T-20FL[XXX]*-A 05520-2-[205/207/221/223]-1 3/4″ 20
    G55-T-20FL[XXX]*-B 05520-2-[205/207/221/223]-2 3/4″ 20
    G55-T-20FL[XXX]*-C 05520-2-[205/207/221/223]-3 3/4″ 20
    G55-T-25FL[XXX]*-A 05525-2-[205/207/221/223]-1 1″ 25
    G55-T-25FL[XXX]*-B 05525-2-[205/207/221/223]-2 1″ 25
    G55-T-25FL[XXX]*-C 05525-2-[205/207/221/223]-3 1″ 25
    G55-T-32FL[XXX]*-A 05532-2-[205/207/221/223]-1 1 1/4″ 32
    G55-T-32FL[XXX]*-B 05532-2-[205/207/221/223]-2 1 1/4″ 32
    G55-T-32FL[XXX]*-C 05532-2-[205/207/221/223]-3 1 1/4″ 32
    G55-T-40FL[XXX]*-A 05540-2-[205/207/221/223]-1 1 1/2″ 40
    G55-T-40FL[XXX]*-B 05540-2-[205/207/221/223]-2 1 1/2″ 40
    G55-T-40FL[XXX]*-C 05540-2-[205/207/221/223]-3 1 1/2″ 40
    G55-T-50FL[XXX]*-A 05550-2-[205/207/221/223]-1 2″ 50
    G55-T-50FL[XXX]*-B 05550-2-[205/207/221/223]-2 2″ 50
    G55-T-50FL[XXX]*-C 05550-2-[205/207/221/223]-3 2″ 50
    G55-T-65FL[XXX]*-A 05565-2-[205/207/221/223]-1 2 1/2″ 65
    G55-T-65FL[XXX]*-B 05565-2-[205/207/221/223]-2 2 1/2″ 65
    G55-T-65FL[XXX]*-C 05565-2-[205/207/221/223]-3 2 1/2″ 65
    G55-T-80FL[XXX]*-A 05580-2-[205/207/221/223]-1 3″ 80
    G55-T-80FL[XXX]*-B 05580-2-[205/207/221/223]-2 3″ 80
    G55-T-80FL[XXX]*-C 05580-2-[205/207/221/223]-3 3″ 80
    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: SCREWED BSP (M) X Rp (F)
    MATERIAL: BRONZE
    SEAT MATERIAL: PTFE
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-V-15-A 05515-3-008-1 1/2″ 15
    G55-V-15-B 05515-3-008-2 1/2″ 15
    G55-V-15-C 05515-3-008-3 1/2″ 15
    G55-V-20-A 05520-3-008-1 3/4″ 20
    G55-V-20-B 05520-3-008-2 3/4″ 20
    G55-V-20-C 05520-3-008-3 3/4″ 20
    G55-V-25-A 05525-3-008-1 1″ 25
    G55-V-25-B 05525-3-008-2 1″ 25
    G55-V-25-C 05525-3-008-3 1″ 25
    G55-V-32-A 05532-3-008-1 1 1/4″ 32
    G55-V-32-B 05532-3-008-2 1 1/4″ 32
    G55-V-32-C 05532-3-008-3 1 1/4″ 32
    G55-V-40-A 05540-3-008-1 1 1/2″ 40
    G55-V-40-B 05540-3-008-2 1 1/2″ 40
    G55-V-40-C 05540-3-008-3 1 1/2″ 40
    G55-V-50-A 05550-3-008-1 2″ 50
    G55-V-50-B 05550-3-008-2 2″ 50
    G55-V-50-C 05550-3-008-3 2″ 50
    G55-V-65-A 05565-3-008-1 2 1/2″ 40
    G55-V-65-B 05565-3-008-2 2 1/2″ 40
    G55-V-65-C 05565-3-008-3 2 1/2″ 40
    G55-V-80-A 05580-3-008-1 3″ 50
    G55-V-80-B 05580-3-008-2 3″ 50
    G55-V-80-C 05580-3-008-3 3″ 50
    DESCRIPTION: PROPORTIONAL LIFT RELIEF VALVE, DOME TOP, SIDE OUTLET
    PIPE CONNECTIONS: FLANGED PN16/PN25/ANSI150/ANSI300
    MATERIAL: BRONZE
    SEAT MATERIAL: VITON
    OLD PART NUMBER NEW PART NUMBER SIZE INS SIZE MM
    G55-V-15FL[XXX]*-A 05515-3-[205/207/221/223]-1 1/2″ 15
    G55-V-15FL[XXX]*-B 05515-3-[205/207/221/223]-2 1/2″ 15
    G55-V-15FL[XXX]*-C 05515-3-[205/207/221/223]-3 1/2″ 15
    G55-V-20FL[XXX]*-A 05520-3-[205/207/221/223]-1 3/4″ 20
    G55-V-20FL[XXX]*-B 05520-3-[205/207/221/223]-2 3/4″ 20
    G55-V-20FL[XXX]*-C 05520-3-[205/207/221/223]-3 3/4″ 20
    G55-V-25FL[XXX]*-A 05525-3-[205/207/221/223]-1 1″ 25
    G55-V-25FL[XXX]*-B 05525-3-[205/207/221/223]-2 1″ 25
    G55-V-25FL[XXX]*-C 05525-3-[205/207/221/223]-3 1″ 25
    G55-V-32FL[XXX]*-A 05532-3-[205/207/221/223]-1 1 1/4″ 32
    G55-V-32FL[XXX]*-B 05532-3-[205/207/221/223]-2 1 1/4″ 32
    G55-V-32FL[XXX]*-C 05532-3-[205/207/221/223]-3 1 1/4″ 32
    G55-V-40FL[XXX]*-A 05540-3-[205/207/221/223]-1 1 1/2″ 40
    G55-V-40FL[XXX]*-B 05540-3-[205/207/221/223]-2 1 1/2″ 40
    G55-V-40FL[XXX]*-C 05540-3-[205/207/221/223]-3 1 1/2″ 40
    G55-V-50FL[XXX]*-A 05550-3-[205/207/221/223]-1 2″ 50
    G55-V-50FL[XXX]*-B 05550-3-[205/207/221/223]-2 2″ 50
    G55-V-50FL[XXX]*-C 05550-3-[205/207/221/223]-3 2″ 50
    G55-V-65FL[XXX]*-A 05565-3-[205/207/221/223]-1 2 1/2″ 65
    G55-V-65FL[XXX]*-B 05565-3-[205/207/221/223]-2 2 1/2″ 65
    G55-V-65FL[XXX]*-C 05565-3-[205/207/221/223]-3 2 1/2″ 65
    G55-V-80FL[XXX]*-A 05580-3-[205/207/221/223]-1 3″ 80
    G55-V-80FL[XXX]*-B 05580-3-[205/207/221/223]-2 3″ 80
    G55-V-80FL[XXX]*-C 05580-3-[205/207/221/223]-3 3″ 80

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