Pressure Relief Valve MODEL 44 68 and 77 PS UL
Pressure Relief Valve,An automatic, pilot controlled, pressure relief valve, actuated by the pipeline pressure. The valve modulates to maintain a steady, predetermined pressure in the network. Should the upstream pressure exceed the required set point, the valve opens, releasing the excessive pressure. When the pressure falls below the set value, the valve closes drip tight.
FEATURES & BENEFITS
Simple field adjustable pressure setting, requiring no special tools or system downtime
Superior design featuring exceptionally low pressure losses at high flow rates
Maintains a steady preset system pressure, regardless of fluctuating supply
Automatically relieves overpressure should upstream pressure exceed the required set point
Low lifelong maintenance costs due to straightforward design
Applicable for fresh or brackish water, seawater & foam
Out of box fully assembled & tested valves
Factory trimmed for vertical or horizontal installations without modification
Extensive valve & trim materials selection and corrosion protection coating
High flows and working pressures (up to PN25/375 psi)
CERTIFICATION & COMPLIANCE
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• ANSI FCI 70-2 Class VI seat leakage class
• UL listed under QXZQ category
• Fire tested to EN ISO 6182-5:2006 (Model 68: 2”-6” only)
• Lloyd’s & ABS approvals
TYPICAL APPLICATIONS
Pump & Water Tanks
Fire Suppression Systems
Petrochemical, Oil & Gas Installations
Tunnels
Power Generation, Transformer & Transmission Plants
Onshore / Offshore
Mining
OPERATION
The OCV PSUL is a pilot controlled, pressure relief valve, actuated by the pipeline pressure. The valve accurately maintains a set pipeline pressure regardless of pump start and stop conditions. The relief pressure can easily be set and modified by use of the adjustment bolt on the pressure relief pilot’s cover.
When the pipeline pressure exceeds the required set point, the valve modulates to maintain a steady, predetermined pressure in the network. When pressure falls below the set value, the valve closes drip tight.
The OCV PSUL’s trim contains an integral and adjustable needle valve which enables high pilot accuracy and control of the valve’s closing speed.
The valve’s low friction design utilizes a pre-shaped reinforced diaphragm and provides exceptionally low pressure losses at high flows and an accurate, stable control no flow to full flow conditions. The simple and reliable design allows easier assembly, improved longevity and reduces periodic inspections and maintenance. When required, maintenance is easily done on site and in-line
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TYPICAL MATERIALS
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(1) Petrochemical, Oil & Gas
(2) Refer to materials selection guidelines, Engineering Data - Materials: Ductile Iron A-536 65-45-12; Cast Steel A-216 WCB; Cast Steel A-352 LCB;
Austenitic Stainless Steel A-351/CF8M; Super Duplex 2507; Nickel-Aluminum-Bronze B-148 UNS C95800
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