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Pressure Control

Pressure relief valves that keep fire suppression system pressure below what the pipework and fittings can withstand

EQUIPMENT

What Is a Pressure Relief Valve, and Where Is It Used?

Fire pumps, particularly at churn (closed-valve) conditions or at low flow, can push system pressure well above the pressure at which the pump started. In tall buildings, adding pump pressure on top of static pressure has a similar effect. A pressure relief valve opens once system pressure crosses a pre-set threshold and discharges the excess water, preventing pipework, fittings and valves from being pushed past their pressure class. If your project’s governing specification (NFPA 20, TS EN 12845, etc.) has a specific clause on pressure relief, confirm the valve selection against that clause with the engineer of record.

The three models we supply in this group include a small-diameter (DN15–DN20) pilot-operated valve, and the FK-RV and FK-PRV3, larger-diameter (DN40–DN300) models offering grooved/flanged/threaded connection options; the FK-PRV3 is the same family’s extended size range, down to DN40.

These valves are used in water-based suppression systems and pump-station piping.

Selection Criteria

  • Connection type: the small-diameter model has a threaded (NPT/BSP) connection; the FK-RV and FK-PRV3 are manufactured in the same size in both grooved and flanged (ANSI or PN16) options. Choose the option matching the line's existing connection type.
  • Pressure-setting range: the small-diameter model is ordered at one of the fixed setpoints listed in the table (51–300 psi band); the FK-RV and FK-PRV3 are rated up to a maximum working pressure of 17.2 bar (250 psi). The system's actual running and churn pressures should be calculated at the design stage.
  • Approval scope: all three models on this page are listed in our source catalogue as UL and FM approved only; contact us if your specification requires CE or VdS approval.
  • Size range: the FK-RV spans DN50–DN300, the FK-PRV3 spans DN40–DN300. There is a small inconsistency between the source catalogue's summary line and the smallest size in the parts table; we confirm the exact size range before ordering.

Models We Supply

We supply the models below for your projects; for the full brand range see Viking fire protection products.

VIKING

7000L050 — Pilot-operated pressure relief valve

Approvals
UL, FM
Max. working pressure
See table below
Material (body)
Brass
Sizes
1/2” (DN15) – 3/4” (DN20)
Connection
Threaded (NPT/BSP male inlet, female outlet)
Part numbers (8)
SizeConnectionTypePressurePart no.
1/2”/DN15DişliBSP/NPT12,1 bar (175 psi)7000L050-175
1/2”/DN15DişliBSP/NPT13.8 bar (200 psi)7000L050-200
1/2”/DN15DişliBSP/NPT15.5 bar (225 psi)7000L050-225
1/2”/DN15DişliBSP/NPT20.7 bar (300 psi)7000L050-300
3/4”/DN20DişliBSP/NPT3,5 bar (51 psi)131054
3/4”/DN20DişliBSP/NPT3,9 bar (57 psi)849833
3/4”/DN20DişliBSP/NPT4,3 bar (62 psi)849834
3/4”/DN20DişliBSP/NPT4,7 bar (68 psi)849835
VIKING

FK-RV — Pressure relief valve

Approvals
UL, FM
Max. working pressure
17.2 bar (250 psi)
Material (body)
Ductile iron
Sizes
2” (DN50) – 12” (DN300)
Connection
Flanged, grooved and threaded
Features
Straight-through body
Part numbers (24)
SizeConnectionPart no. (Horizontal)Part no. (Vertical)
2”/DN50 (60,3)YYFK-RV-H060GDFK-RV-V060GD
2-1/2”/DN65 (73,0)YYFK-RV-H073GDFK-RV-V073GD
2-1/2”/DN65 (76,1)YYFK-RV-H076GDFK-RV-V076GD
3”/DN80 (88,9)YYFK-RV-H089GDFK-RV-V089GD
4”/DN100 (114,3)YYFK-RV-H114GDFK-RV-V114GD
6”/DN150 (165,1)YYFK-RV-H165GDFK-RV-V165GD
6”/DN150 (168,3)YYFK-RV-H168GDFK-RV-V168GD
8”/DN200 (219,1)YYFK-RV-H219GDFK-RV-V219GD
2”/DN50FF ANSIFK-RV-H0200FADFK-RV-V0200FAD
2-1/2”/DN65FF ANSIFK-RV-H0250FADFK-RV-V0250FAD
3”/DN80FF ANSIFK-RV-H0300FADFK-RV-V0300FAD
4”/DN100FF ANSIFK-RV-H0400FADFK-RV-V0400FAD
6”/DN150FF ANSIFK-RV-H0600FADFK-RV-V0600FAD
8”/DN200FF ANSIFK-RV-H0800FADFK-RV-V0800FAD
10”/DN250FF ANSIFK-RV-H1000FADFK-RV-V1000FAD
12”/DN300FF ANSIFK-RV-H1200FADFK-RV-V1200FAD
2”/DN50FF PN16FK-RV-H0200FPDFK-RV-V0200FPD
2-1/2”/DN65FF PN16FK-RV-H0250FPDFK-RV-V0250FPD
3”/DN80FF PN16FK-RV-H0300FPDFK-RV-V0300FPD
4”/DN100FF PN16FK-RV-H0400FPDFK-RV-V0400FPD
6”/DN150FF PN16FK-RV-H0600FPDFK-RV-V0600FPD
8”/DN200FF PN16FK-RV-H0800FPDFK-RV-V0800FPD
10”/DN250FF PN16FK-RV-H1000FPDFK-RV-V1000FPD
12”/DN300FF PN16FK-RV-H1200FPDFK-RV-V1200FPD
VIKING

FK-PRV3 — Pressure relief valve

Approvals
UL, FM
Max. working pressure
17.2 bar (250 psi)
Material (body)
Ductile iron
Sizes
2” (DN50) – 12” (DN300)
Connection
Flanged, grooved and threaded
Features
Straight-through body
Part numbers (27)
SizeConnectionPart no. (Horizontal)Part no. (Vertical)
1-1/2”/DN40 (48,3)YYFK-PRV3-H048GDFK-PRV3-V048GD
2”/DN50 (60,3)YYFK-PRV3-H060GDFK-PRV3-V060GD
2-1/2”/DN65 (73,0)YYFK-PRV3-H073GDFK-PRV3-V073GD
2-1/2”/DN65 (76,1)YYFK-PRV3-H076GDFK-PRV3-V076GD
3”/DN80 (88,9)YYFK-PRV3-H089GDFK-PRV3-V089GD
4”/DN100 (114,3)YYFK-PRV3-H114GDFK-PRV3-V114GD
6”/DN150 (165,1)YYFK-PRV3-H165GDFK-PRV3-V165GD
6”/DN150 (168,3)YYFK-PRV3-H168GDFK-PRV3-V168GD
8”/DN200 (219,1)YYFK-PRV3-H219GDFK-PRV3-V219GD
1-1/2”/DN40FF ANSIFK-PRV3-H0150FADFK-PRV3-V0150FAD
2”/DN50FF ANSIFK-PRV3-H0200FADFK-PRV3-V0200FAD
2-1/2”/DN65FF ANSIFK-PRV3-H0250FADFK-PRV3-V0250FAD
3”/DN80FF ANSIFK-PRV3-H0300FADFK-PRV3-V0300FAD
4”/DN100FF ANSIFK-PRV3-H0400FADFK-PRV3-V0400FAD
6”/DN150FF ANSIFK-PRV3-H0600FADFK-PRV3-V0600FAD
8”/DN200FF ANSIFK-PRV3-H0800FADFK-PRV3-V0800FAD
10”/DN250FF ANSIFK-PRV3-H1000FADFK-PRV3-V1000FAD
12”/DN300FF ANSIFK-PRV3-H1200FADFK-PRV3-V1200FAD
1-1/2”/DN40FF PN16FK-PRV3-H0150FPDFK-PRV3-V0150FPD
2”/DN50FF PN16FK-PRV3-H0200FPDFK-PRV3-V0200FPD
2-1/2”/DN65FF PN16FK-PRV3-H0250FPDFK-PRV3-V0250FPD
3”/DN80FF PN16FK-PRV3-H0300FPDFK-PRV3-V0300FPD
4”/DN100FF PN16FK-PRV3-H0400FPDFK-PRV3-V0400FPD
6”/DN150FF PN16FK-PRV3-H0600FPDFK-PRV3-V0600FPD
8”/DN200FF PN16FK-PRV3-H0800FPDFK-PRV3-V0800FPD
10”/DN250FF PN16FK-PRV3-H1000FPDFK-PRV3-V1000FPD
12”/DN300FF PN16FK-PRV3-H1200FPDFK-PRV3-V1200FPD

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