Overview
ZDHS electric high-pressure cage control valve consists of a PSL or 381L series linear-motion electric actuator and a high-pressure cage-type control valve body. It was developed to solve the severe problems of short service life, stem breakage and bushing detachment commonly encountered with control valves under high pressure or high differential pressure with severe cavitation and erosion. The cage-guided throttling design distributes the differential pressure across the cage, reducing cavitation, erosion and turbulence damage.
The electric actuator has an integrated structure with a built-in servo amplifier. The valve opening is controlled directly by applying the input control signal (4-20 mA DC or 1-5 V DC) together with the power supply, achieving regulation of process parameters such as pressure, flow, level and temperature. The straight-through body with a single-guided plug offers a simple flow path and low flow resistance. The valve is suitable for regulating high-viscosity fluids and media containing suspended solids and particles, preventing coking, adhesion and blockage. Overall, the valve features sensitive response, simple wiring, high capacity, compact size and high control accuracy.
Main Technical Parameters
| Nominal Diameter DN (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Seat Diameter dn (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Rated Flow Coefficient Kv | Single-seat | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 630 | 875 | 1250 |
| Cage | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 155 | 250 | 370 | 580 | 900 | 1300 | |
| Allowable Differential Pressure (MPa) | ≤ Nominal pressure | |||||||||||||
| Nominal Pressure PN (MPa) | 10.0, 16.0, 25.0, 32.0, 45.0 | |||||||||||||
| Rated Stroke (mm) | 16 | 25 | 40 | 60 | 100 | |||||||||
| Bonnet Type | Standard (-17 ~ +250 °C), high-temperature (+250 ~ +450 °C) | |||||||||||||
| Gland Type | Bolted gland | |||||||||||||
| Packing | V-type PTFE packing, V-type flexible graphite packing | |||||||||||||
| Plug Type | Single-seat, cage | |||||||||||||
| Flow Characteristic | Equal percentage | |||||||||||||
| Actuator Type | 3810 series, PSL series electric actuators (other brands available on request) | |||||||||||||
| Actuator Parameters | Power supply: 220 V; input signal: 4-20 mA or 1-5 V DC; output signal: 4-20 mA DC | |||||||||||||
| Protection rating: equivalent to IP65; explosion-proof: Ex d IIB T4 (Ex d IIB T6 on special order); manual operation: handwheel | ||||||||||||||
| Ambient temperature: -25 ~ +70 °C; ambient humidity: ≤95% | ||||||||||||||
Main Parts Materials
| No. | Component | WCB | 304 | 316 | 316L |
|---|---|---|---|---|---|
| 1 | Valve Body | WCB | 304 | 316 | 316L |
| 2 | Gasket | PTFE/graphite gasket | PTFE/graphite gasket | PTFE/graphite gasket | PTFE/graphite gasket |
| 3 | Cage | 304 | 304 | 316 | 316L |
| 4 | Plug | 304 | 304 | 316 | 316L |
| 5 | Body Gasket | PTFE/graphite gasket | PTFE/graphite gasket | PTFE/graphite gasket | PTFE/graphite gasket |
| 6 | Bonnet | WCB | 304 | 316 | 316L |
| 7 | Bolt | 25 steel | Stainless steel | Stainless steel | Stainless steel |
| 8 | Stem | 304 | 304 | 316 | 316L |
| 9 | Packing | PTFE/graphite | PTFE/graphite | PTFE/graphite | PTFE/graphite |
| 10 | Bolt | 25 steel | Stainless steel | Stainless steel | Stainless steel |
| 11 | Packing Gland | WCB | 304 | 316 | 316L |
Performance Specifications
| Item | Type | Point | Value |
|---|---|---|---|
| Basic Error (%) | With 381L: ±2.5; with PSL: ±1.0 | ||
| Hysteresis (%) | With 381L: ±2.0; with PSL: ±1.0 | ||
| Dead Band (%) | 1.0 | ||
| Deviation of Start/End Points (%) | Direct-acting | Start point ±2.5 | End point ±2.5 |
| Reverse-acting | Start point ±2.5 | End point ±2.5 | |
| Rated Stroke Deviation (%) | ≤2.5 | ||
| Leakage (L/h) | 0.01% × rated valve capacity | ||
| Rangeability R | 30:1 | ||
Installation & Connection Dimensions
| Nominal Diameter DN (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| L | National standard | National standard pressures: PN10.0, 16.0, 25.0, 32.0, 45.0 MPa; American standard pressures: 150 LB, 300 LB, 600 LB, 900 LB, 1500 LB, 2500 LB | ||||||||||
| American standard | ||||||||||||
| H, H1, H2 | H and H1: dimensions to be determined by engineering design; H2 and D: dimensions depend on the actuator torque of the control valve | |||||||||||
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