Specifications

89
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Model P4000 Pressure Relief Valve
• 1/2”, 3/4”
• Ideal for installation on fire sprinkler systems
• Protects against excessive pressure buildup caused by pumps, elevated
piping and thermal expansion
• Available pressure ranges: 0 to 75 psi (FM), 20 to 175 psi (UL/FM), 100
to 300 psi (FM)
• Temperature range: water, air to 180°F
• Body and cover materials: cast bronze ASTMB62, cast aluminum 356-
T6, stainless steel ASTM A743C7-167A
• UL
®
listed, FM
®
Approved
For Additional Information, reference WK-ACV catalog or visit
our web site.
Typical Installation Features
The pressure relief valve prevents pressure build-up in a fire protection system or other closed type
system whenever the line pressure exceeds the setting of the spring. The valve will relieve excess
pressure to atmosphere preventing damage to the distribution network. Ideal for installation on fire
protection systems to protect against excessive pressure build-up caused by pumps, elevated piping
and thermal expansion.
Underwriters Laboratories requires the installation of pressure gauges upstream and downstream of the pressure reducing valve.
Also, a relief valve of not less than 1/2” in size must be installed on the downstream side of the pressure control valve. Adequate
drainage for the relief valve discharge must be provided.
Applications
ZW109FP
PRESSURE
REDUCING VALVE
MODEL P4000
PRESSURE
RELIEF VALVE
ZW109FP
PRESSURE
REDUCING VALVE
MODEL P4000
PRESSURE
RELIEF VALVE
MAIN FIRE
HEADER
DISTRIBUTION TO EACH FLOOR
Pressure Relief Valves