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KSB MIL 76000 HP Letdown Valve PRDS — Pressure Reducing Station

Designed for extreme pressure reduction across a single valve. Multi-stage trim handles differential pressure up to 400 bar. For PRDS (Pressure Reducing & Desuperheating Stations), turbine bypass during startup/shutdown, and boiler startup systems. Class 900–4500. 1” to 16”.

Multi-Material HP LetdownClass 900–45001” to 16”

Specifications

ParameterSpecification
SeriesMIL 76000
Body MaterialWCB / WC6 / WC9 / CF8M / Alloy
Pressure ClassClass 900–4500
Size Range1” to 16”
Max Temperature593°C
Max PressureClass 4500
Design StandardIEC 60534
End ConnectionsFlanged RF/RTJ, Butt Weld
ConstructionStandard, extended for high temperature service
Trim / SealingMulti-stage pressure reduction, up to 50 stages, combined with Lo-dB noise attenuation
✓ IEC 60534

Material & Applications

Why Multi-Material HP Letdown: The MIL 76000 handles pressure drops that would destroy a conventional control valve within hours. The multi-stage trim (up to 50 stages) progressively reduces pressure in controlled steps, preventing the formation of cavitation in liquid service and controlling jet velocity in steam/gas service to prevent erosion and noise. Combined with MIL 77000 Lo-dB noise trim technology for quiet operation even at extreme pressure drops. This is one of the most engineered valve products in the KSB MIL range, with each valve custom-designed to the specific process conditions.

Typical applications: PRDS systems reducing main steam from boiler pressure to process pressure. Turbine bypass during startup, shutdown, and load rejection. HP heater emergency drain. Boiler startup vent systems. Any application with extreme pressure differential (up to 400 bar) across a single valve.

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Other Variants

Anti-Cavitation MIL 77000 Globe MIL 41000 V-Notch Ball MIL 71000 All MIL Control Valves →

Service Area

Pune, Ahmednagar & Beed.

Multi-Material HP Letdown Control Valve FAQs

What is a PRDS valve?
PRDS stands for Pressure Reducing & Desuperheating Station. It consists of two components: (1) a pressure reducing valve (MIL 76000) that drops high-pressure boiler steam to the lower pressure required by the process, and (2) a desuperheater that injects water to reduce steam temperature to the required level. The MIL 76000 handles the pressure reduction component. The desuperheater is typically a separate device.
How many stages of pressure reduction?
Up to 50 stages, depending on the total pressure drop and fluid conditions. Each stage is designed so that the local pressure never drops below the fluid's vapor pressure (preventing cavitation in liquid service) or exceeds the critical velocity ratio (preventing excessive noise in gas/steam service). KSB engineering calculates the number of stages based on your specific process datasheet.
What is the difference between MIL 76000 and MIL 77000?
MIL 76000 is specifically designed for extreme HP letdown (Class 900–4500) with multi-stage trim optimized for maximum pressure reduction. MIL 77000 is a more general anti-cavitation/Lo-dB valve available in Class 150–2500. For extreme pressure drops (above Class 600), the MIL 76000 is the correct choice. For moderate severe service in Class 150–600, the MIL 77000 may be sufficient.

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