Indus Industrial Group supplies heavy-duty Hydraulic Pressure Relief and Sustaining Safety Control Valves engineered across nominal diameters from DN50 to DN600 in pressure classes PN16 and PN25 according to AWWA C530 and EN 1074-5 standards. Configured to perform dual critical safety functions—operating as a rapid-opening pressure relief valve to discharge dangerous water hammer pressure spikes, or as an upstream pressure sustaining valve to prevent pump overloading and maintain minimum network pressure—these valves feature ductile iron bodies (EN-GJS-500-7) with stainless steel pilot controls.
| Pricing Verification | Commercial Quote on Demand (RFQ) |
| Governing Standards | AWWA C530 / EN 1074-5 / ISO 10522 / BS EN 1267 |
| Face-to-Face Standard | EN 558-1 Series 1 (ISO 5752 Globe Pattern) |
| Nominal Diameter Range | DN50 to DN600 (Metric Flanged to EN 1092-2) |
| Pressure Classes | PN16, PN25 (Bar) |
| Relief / Sustaining Range | 2.0 Bar to 16.0 Bar (Adjustable spring pilot) |
| Response Time | Instantaneous opening (< 0.2 seconds under overpressure spike) |
| Body & Bonnet | Ductile Iron EN-GJS-500-7 (min 420 MPa tensile strength) |
| Diaphragm Element | Nylon-Reinforced EPDM (High flex fatigue life) |
| Pilot & Trim | Stainless Steel AISI 316 with Needle Valve Speed Control |
| Surface Protection | Fusion-Bonded Epoxy (FBE ≥ 250 µm) WRAS Drinking Water Certified |
| Sector & Division | Water & Wastewater (Div 01) |
| Parent Category | Pressure Reducing Valves |
Booster pump station surge relief headers, river intake raw water overpressure protection, reservoir gravity line pressure sustaining, deep wellhead protection, and municipal distribution safety relief across Baghdad, Erbil, Basra, Kirkuk, and Nineveh.
Pressure Relief and Pressure Sustaining Safety Control Valves represent the primary hydraulic safety barrier against catastrophic pipeline rupture, pump station backpressure collapse, and surge shocks across Iraq. Governed by AWWA C530, EN 1074-5, and ISO 10522 standards, this hydraulically operated globe valve utilizes line water pressure to actuate a resilient elastomeric diaphragm. When configured as a Pressure Relief Valve, it remains closed during normal operation; if line pressure exceeds a pre-calibrated safety threshold due to sudden pump trips or valve closures, the high-sensitivity stainless steel pilot opens instantaneously, discharging high-velocity surge spikes safely into a retention sump or river before pipe walls can fracture.
When configured as a Pressure Sustaining Valve, the unit is installed in-line to monitor upstream pressure. If downstream consumption surges or a line break occurs, the valve automatically throttles to maintain a guaranteed minimum pressure in the upstream network, preventing municipal booster pumps from running off their head curves into cavitation and cavitation-induced motor burnout. Closing speed is precisely regulated via an adjustable needle valve to prevent generating secondary water hammer transients during reset.
Coated inside and out with electrostatically applied blue fusion-bonded epoxy (min 250 µm, WRAS approved), the valve operates reliably in high-ambient desert environments up to +55°C. Staged at the Erbil Heavy Plant Yard, Baghdad Central Logistics Depot, and Basra Port Hub, Indus supplies complete relief/sustaining valve packages with pre-calibrated pilots, pressure gauges, and full EN 10204 3.1 inspection certification.
When electricity suddenly cuts out, running pumps stop instantly, generating a massive reflected high-pressure wave (water hammer). The Indus relief valve opens in milliseconds, discharging the high-pressure water pulse into a sump or back into the suction reservoir, keeping line pressure within safe structural limits.
When downstream demand exceeds supply, pressure drops dangerously, causing pumps to pump excessive flow at zero head (run-out), leading to cavitation and motor burnout. The sustaining valve throttles back to maintain a fixed minimum backpressure against the pump, keeping it safely on its operating curve.
Yes. Indus technicians bench-test and pre-calibrate the stainless steel pilot to the contractor specified relief or sustaining setpoint prior to dispatch from our Erbil, Baghdad, or Basra facilities.
