PRESSURE RELIEF
VALVE
The Hydrocore™ Symmetrical (area-ratio) Pressure Relief Valve is a unique development as it enables the use of the valve in high pressure applications as well as low pressure applications, without changes to the valve.
The Pressure Relief Valve prevents excessive pressure conditions by discharging fluid from a fluid transfer system into a reservoir or a drain. The valve's piston is in equilibrium state when the opening forces resultant 'Fw' equals the nitrogen gas closing force 'FG' or the spring’s Fuo Fuc force.
FEATURES
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Enables the use of the valve in high pressure applications as well as low pressure applications, without changes to the valve.
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Can suit all valve sizes and pressure ratings.
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No actuators, pilots or instruments needed.
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Suitable for low flow (high velocity).
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Improved anti-cavitation on valve seat area.
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Increased longevity of valve lifespan.
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Requires minimal maintenance, consisting of an annual cleaning and greasing of the sealing surfaces inside the valve’s bore.
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The pressure relief valves are fully compatible with the isolating valves and can be converted with minimal cost and time.
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Stainless steel moving internals parts
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Cast steel body
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Low pressure drop across valve
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Flanges and face-to-face dimensions to customer specification
SPECIFICATIONS
FLOW COEFFICIENTS & FLOW RATES
​Pressure rating
Sizes 50NB ~ 100NB: 250 bar (max)
Sizes 150NB ~ 300NB: 160 bar (max)
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Temperature rating
Up to 85ºC with standard seals.
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Media
Liquid and gas with low content of suspended solids.
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Pipe sizes
2” (50 NB) to 16” (400 NB)
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Flanges
SABS 1123, BS4504, BS10, ASME B16.34, ANSI B16.5
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pH levels & chlorides
Parts of the valve are made from stainless steel and can withstand a low level of chlorides.
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Installation position
The valve can be installed in any position
Seating
Seat Leakage - B16.104 class III, IV, V or VI, depends on valve type and application.
50 NB
Cv/Kv: 50 | Flow (max): 9 â„“/sec
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80 NB
Cv/Kv: 97 | Flow (max): 25 â„“/sec
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100 NB
Cv/Kv: 132 | Flow (max): 38 â„“/sec
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150 NB
Cv/Kv: 325 | Flow (max): 117 â„“/sec
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200 NB
Cv/Kv: 648 | Flow (max): 152 â„“/sec
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250 NB
Cv/Kv: 871 | Flow (max): 233 â„“/sec
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300 NB
Cv/Kv: 1500 | Flow (max): 337 â„“/sec
DIMENSIONS AND WEIGHTS
SIZE
50 NB
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80 NB
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100 NB
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150 NB
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200 NB
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250 NB
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300 NB
A (mm)
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121
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173
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202
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262
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310
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378
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425
B (mm)
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120
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172
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183
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282
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329
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378
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425
#150 F-T-F
203mm / 16kg
​
267mm / 23kg
​
292mm / 31kg
​
356mm / 109kg
​
495mm / 245kg
​
622mm / 465kg
​
699mm / 705kg
#300 F-T-F
267mm / 18kg
​
318mm / 28kg
​
356mm / 41kg
​
445mm / 131kg
​
559mm / 275kg
​
622mm / 498kg
​
711mm / 755kg
#600 F-T-F
292mm / 19kg
​
356mm / 31kg
​
432mm / 53kg
​
559mm / 162kg
​
660mm / 316kg
​
787mm / 585kg
​
838mm / 839kg
#900 F-T-F
​
368mm / 33kg
​
381mm / 41kg
​
457mm / 64kg
​
610mm / 187kg
​
737mm / 358kg
​
838mm / 636kg
​
965mm / 954kg
#1500 F-T-F
​
368mm / 33kg
​
470mm / 51kg
​
546mm / TBD
​
705mm / TBD
​
832mm / TBD
​
991mm / TBD
​
1130mm / TBD
