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IMI CCI
LST Longer Serviceable Trim Control Valve Upgrade
LST Longer Serviceable Trim is designed to reduce cavitation and erosion at low flow conditions, extending valve life and improving control performance in demanding liquid service applications.
Extends trim service life by up to four times in low flow conditions
Reduces cavitation damage to protect seating surfaces
Improves control stability and turndown in critical applications
Features
Longer Serviceable Trim (LST) for low-flow cavitation control
Longer Serviceable Trim from IMI CCI is designed as an upgrade solution for 840 Series and 860 Series control valves operating at or below their intended range.In these conditions, conventional trims lose control effectiveness and become exposed to high local velocities and cavitation, driving wear, leakage and reduced reliability.LST addresses this by controlling where pressure drop occurs within the valve, maintaining stability at low openings while protecting critical components. The result is improved performance and significantly longer service life in demanding liquid applications.
Where issues occur
Control valves regulate flow through engineered passages that manage pressure and velocity. This works within the design range, but at low flow those passages close and control shifts to the clearance between the plug and cage.This creates concentrated energy and cavitation directly at the seating surface, accelerating erosion and degrading performance.
Cavitation at low flow conditions causes rapid erosion of valve trim, leading to leakage and reduced performance.
What LST changes
LST redistributes the pressure drop away from the seating surface and introduces controlled flow features within the trim.This reduces cavitation intensity at critical points, maintains stable control at low openings and limits damage.By addressing the root cause of low-flow wear, LST extends service intervals and improves reliability across a wider operating range.
LST design controls pressure drop at low openings to reduce cavitation and protect the seating surface.
Key features
Plug nose shifts vena contracta downstream
Labyrinth grooves reduce clearance Cv
Gap control stabilises low flow
Anti-cavitation cage design
Protects seating surface
Maintains control at low openings
Smooth transition to full flow
Retrofit-compatible design
Supports high rangeability
Extends maintenance intervals
Specifications
Design Codes
ASME B16.34
Certification
PED
ATEX
CRN
TSG
Material
Carbon steel
Alloy steel
Stainless steel
Max. ASME Rating
1500
Temperature Limits (°C)
-29 to 260
Actuator Type
Pneumatic
Electric
Hydraulic
Fluid Types
Water
Liquid
Trim Category
Single Stage
Multi-stage
Service Category
General
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