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KSB MIL 77000 Anti-Cavitation & Low-Noise Control Valve

Multi-stage trim design that breaks pressure drop into multiple small steps, eliminating cavitation in liquid service and reducing noise in gas/steam service. For severe service where standard single-stage valves would cavitate, erode, or generate excessive noise. 1” to 16”. Class 150–2500.

Multi-Material Severe ServiceClass 150–25001” to 16”

Specifications

ParameterSpecification
SeriesMIL 77000 / 78000
Body MaterialWCB / WCC / CF8M / SS 316 / Alloy
Pressure ClassClass 150–2500
Size Range1” to 16”
Max Temperature593°C
Max PressureClass 2500
Design StandardIEC 60534
End ConnectionsFlanged RF/RTJ, Butt Weld
ConstructionStandard, extended for high temperature
Trim / SealingMulti-stage anti-cavitation cage; Lo-dB noise attenuation trim
✓ IEC 60534

Material & Applications

Why Multi-Material Severe Service: Cavitation destroys valve internals and downstream piping within weeks or months. The multi-stage trim breaks the total pressure drop into 10–50 small steps, keeping the pressure at each stage above the fluid vapor pressure so cavitation bubbles never form. For gas/steam service, the Lo-dB trim controls jet velocity at each stage, reducing aerodynamic noise by 15–25 dB(A) compared to single-stage trim. This is often the difference between a valve installation that exceeds workplace noise limits and one that complies.

Typical applications: HP steam letdown stations, gas pressure reduction, boiler feedwater control at high differential pressure, flashing liquid service, and any application where the pressure drop across the valve exceeds the critical cavitation index of the fluid. Also for gas service where single-stage pressure drop would generate noise levels exceeding OSHA workplace limits (85 dB(A)).

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Other Variants

Globe MIL 41000 HP Letdown MIL 76000 V-Notch Ball MIL 71000 All MIL Control Valves →

Service Area

Pune, Ahmednagar & Beed.

Multi-Material Severe Service Control Valve FAQs

What is cavitation and why is it destructive?
Cavitation occurs when local fluid pressure drops below the vapor pressure, forming vapor bubbles. When pressure recovers downstream, these bubbles collapse violently (implode), generating extreme local forces (up to 100,000 psi) that pit and erode metal surfaces. A cavitating valve can destroy a hardened Stellite trim in weeks. Multi-stage trim prevents cavitation by ensuring pressure never drops below vapor pressure at any stage.
How much noise reduction does Lo-dB provide?
Typically 15–25 dB(A) reduction compared to single-stage trim at the same operating conditions. For example, a gas letdown that would generate 105 dB(A) with a standard trim might produce only 82 dB(A) with Lo-dB trim. This is significant because the OSHA workplace limit is 85 dB(A) for 8-hour exposure.
How many stages are needed?
Depends on total pressure drop and fluid properties. The number of stages is calculated so that the pressure drop per stage stays below the fluid's incipient cavitation coefficient. Typical: 5–15 stages for moderate service, 20–50 stages for extreme HP letdown. KSB engineering sizes the trim based on your process datasheet.

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