Excellent Valves for Isolation & Control


CV1800 Multi Stages Control Valve

CV1800 Multi Stages Control Valve

Valve Type:                                                 Multi-stages control valve for noise reduction & cavitation elimination


Valve Nominal Size:                                  DN25 through DN500; 1 inch through 20 inch


Pressure Rating:                                         PN16, 40, 100, 160, 250, 400; ANSI Class 150, 300, 600, 900, 1500, 2500


Body Style:                                                  Full guided globe or angle


Trim Type:                                                   Balanced or unbalanced plug,

                                                                       Single stage or multi stages seat-retainer (cavitation elimination type, noise reduction type), 

                                                                       Single stage or multi stages plug-head (cavitation elimination & noise reduction type)


Flow Direction:                                           Flow under the plug (recommended for noise control);

                                          Flow over the plug (recommended for cavitation elimination)


Flow Characteristic:                                   Equal percentage EQ%; Linear


Rangeability:                                               50:1


Temperature Range:                                 Standard bonnet from -29°C to 250 °C; Extension type from -100°C to 650°C;

                                          Bellows type from -60°C to 537°C; Cryogenic type down to -196°C


Seat Leakage:                                             Pressure unbalanced type ANSI IV or V; Pressure balanced type ANSI IV;

                                                                      Stages plug head type ANSI V


Actuator:                                                     Pneumatic cylinder actuator; Pneumatic diaphragm actuator;

                                         Electric actuator; Hand-wheel manual for option

Description & Features

CV1800 Multi Stages Control Valve for cavitation elimination


Balanced and unbalanced plug is optional.


Quick disassembly and easy replacement.


Protect plug, seat and sealing face from noise and cavitation damage, to have fine control characteristic and long service life.


Double travel-limits protection by over travel.


Quick disassembly and easy replacement.


CV1800 multi stages control valves using throttling multi-cages trims, to have pressure reducing stage by stage and fluid velocity control, then eliminate cavitation, flash, vibration and noise. For a given valve size the extension varies according to number of stages while using the same bonnet and body.


Multi stages control valves is mainly applied for high temperature and high pressure severe service and special designed according to customer requirement, to overcome high pressure drops, high velocity, and have tight shut-off.


Stable motion: plug and seat retainer is double top bottom guided design and plug is closely guiding in the seat ring, valve is full guided operated.


Multi stages trim type: Noise reduction seat retainer, cavitation elimination seat retainer, cavitation elimination & noise reduction plug head.



1. Noise reduction seat retainer

Noise reduction trim eliminates control valve noise by staging effectively with gaseous pressure reduction, and by controlling turbulence carried into the downstream piping. Design mainly service for compressible fluid as steam, air, natural gas, .etc. Adaptable for gaseous throttling, diffusion and expansion, noise attenuation is basically constructed from heavy-duty drilled-hole cylinders, the pressure drop in cage is distributed when the sudden expansions and contractions that take place as the flow passes through the cage, so pressure reduction occurs not only at the throttling point between the plug and seat, but also at each stage. Gradual pressure reduction is designed avoiding high velocities, reducing noise achieved by designing sufficient stages to keep the velocity low.


Noise reduction trim is an economy solution, design consists of a series of retainers which can reduce noise levels by up to 20 dBA.



2. Cavitation elimination seat retainer

Cavitation control or elimination trim is used in liquid medium, effectively minimizes cavitation damage to trim by controlling where the cavitation vapor bubbles implosion keeping them away from metal parts.


Principle is using special seat retainer, its walls have many diametrically opposed holes and flow direction to close. As the plug lifts off the seat, fluid flow into pairs of holes and center of the trim, where opposing streams collide allowing the cavitation vapor bubbles to collapse harmlessly against themselves, to eliminate the damaging effects of cavitation.



3. Cavitation elimination & noise reduction plug head

Cage type plug structure, gradual pressure reduction by multi-stages throttling cages to control velocity for eliminating cavitation, flashing, vibration and noise, effectively protect sealing face of plug and seat to extend valve service life longer much. Pressure seal type bonnet design, compensates seal as temperature and pressure changing.


Served for solving problem of much noise applications, wide service as steam control valve, pressure reducing valve of steam conditioning.


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