Why ZZPV One-stop Hydraulic Power Station
- Over 30+ years custom hydraulic power station projects.
- With ISO9001, ISO14001, ISO45001, TS ,material certificate etc.
- HPU pressure, flow are selected according to the actual actuator requirements
- Fully integrated pump, motor, manifold, valves, filters, gauges and accumulators.
- Local/remote + PLC control, with 4-20mA valve position feedback.
- Complete functional test of every customized hydraulic power unit
Your Reliable Hydraulic Power Unit Supplier in China
Established in 1995, ZZPV possesses over 30 years manufacturing experience in Hydraulic Power Units and matched valve & actuator systems. We tailor complete hydraulic power unit configurations to suit your project, supplying either standalone power sources or full hydraulic valve packages.
Product By Working Conditions
Mounting method determines how the hydraulic power station integrates with the valve, the piping layout, and the available space on site. Whether the station is separated from the valve or mounted directly on it affects installation time, maintenance access, and external piping complexity.Certain sites demand more than standard hydraulic power units: explosive atmospheres, outdoor exposure, multi-valves etc. Hazardous-Area HPUusually requested by oil, gas, chemical, and other hazardous areas.
Each option is configured to meet the specific safety and protection level of the installation site.
Electrical components (solenoid valves, limit switches, etc.) ExdIIBT4，design for hazardous areas in oil, chemical and gas industries
Weatherproof design for open-air installation, rain hood, sealed enclosure, anti-corrosion coating and IP-rated components protect it from rain, dust and humidity.
Integrated with PLC for automatic valve operation, status monitoring, alarms and communication with DCS/SCADA or other control systems.
A centralized hydraulic power unit supplies multiple valve actuators through individually configured hydraulic control circuits.
Configured with duty/standby pumps or other redundant components to provide automatic backup and enhance reliability for critical valve applications.
Integrated flow meter provides continuous flow measurement, safety alarm output, and network communication for remote diagnostics and system protection.
Effectively avoiding damage caused by onsite water‑logging and splashing water.
Hydraulic station separated from valve, flexible piping layout for space-limited sites
Hydraulic station mounted on valve body, space-saving, reduced external piping
All-in-one cabinet, front operation panel, hydraulic valve manifold & cooling system installed on side compartments, compact integrated design.
Product By Control Function
Hydraulic power stations are classified by their control logic and emergency response capability. The type of valve, the required closing speed, and the availability of external power during an emergency determine which control function is appropriate. The code system below helps engineers select the right configuration.
Counterweight Auto-Pressure-Holding Slow-Closing Type Hydraulic Power UnitCounterweight energy storage, fast-close + slow-close, gravity-driven valve closure on power failure, water hammer elimination
Counterweight Type with Auto-Lock Hydraulic Power UnitCounterweight closure + mechanical lock, locked in position to prevent drift
Accumulator Slow-Closing Type Hydraulic Power UnitAccumulator storage, emergency closure or hold on power failure
Accumulator Slow-Closing Type with Auto-Lock Hydraulic Power UnitAccumulator closure + mechanical lock, prevents rebound after pressure decay
Accumulator Fast-Closing Type Hydraulic Power UnitAccumulator-powered fast closure, emergency shut-off
Accumulator Fast-Closing Type with Proportional Control Hydraulic Power UnitFast shut-off + proportional/servo, adjustable opening at any position
Spring Fast-Closing Type Hydraulic Power UnitValve closing time: ≤0.3 s Spring energy storage fast reset, simple structure, for small/medium valves
Spring Fast-Closing Type with Proportional Control Hydraulic Power UnitSpring fast acting + proportional/servo, fast action with precise adjustment
Proportional (Servo) Regulating Type Hydraulic Power UnitServo/proportional control, continuous adjustment at any valve opening
Standard Hydraulic Power UnitStandard hydraulic power unit, fast delivery, for common working conditions
Why You Need Our Hydraulic Power Station
A fully integrated hydraulic power station featuring technical drawing approval, accumulator backup, fail-safe operation, PLC control, adjustable speed, redundant pump design, multi-valve control, and preferred brand components for complete project compliance.
Valve operation remains available during specified power-loss conditions
Supports fast shut-off (20–90 seconds) and slow shut-off (2.5–30 seconds), No water hammer, no overshoot, full shut-off.
Duty/standby pumps provide continuous hydraulic power for critical applications
Enables automated control, monitoring for easier integration with plant automation
One HPU can serve multiple valves (eg. 1-to-5 control) from a shared power source, significantly reducing the equipment costs and footprint.
Supports EPC and approved-vendor requirements including motors, PLCs, hydraulic components and electrical equipment.
Every HPU is functionally tested before shipment, inspection reports are delivered with the unit, minimizing on-site commissioning time and risk.
12-month warranty, 24/7 response, service engineers available for troubleshooting and remote technical support.
Engineered HPU Sizing
Send us your valve model, drawing or actuator datasheet — even if incomplete. Our engineers will review the available data, identify missing parameters, and size the HPU from the actuator up: hydraulic pressure from actuator torque, pump flow from your required opening or closing time, and accumulator capacity from usable oil volume and required emergency cycles.
Every unit is functionally tested and commissioned with a valve before delivery — pressure holding, directional valve response, emergency closing sequence, accumulator pre-charge verification, PLC logic and parameter settings, and 4-20mA position feedback calibration. The test record will ship with the unit.
Your Custom Hydraulic Power Unit
Every unit is engineered around your valve, actuator, operating sequence and site conditions. Pump, manifold, accumulator, filter and solenoid valves come together as one integrated system. From component brands to control logic and hydraulic configuration, each station is tailored to deliver precise opening, closing and adjustable operating speeds.
Resource
Download our full product catalog to get a general overview of ZZPV’s hydraulic power stations and capabilities.
Product-focused slides with photos, principles and technical details of hydraulic power unit.
Covers the standard electrical and hydraulic components supplied with every hydraulic power station.
Why Valve Manufacturers Choose Our HPU
Valve + Actuator + HPU Integration
Unlike general hydraulic equipment suppliers, ZZPV manufactures hydraulic valves and actuators as well as hydraulic power units. This allows us to evaluate the complete valve actuation system rather than sizing the HPU as an isolated component.
Founded in 1995, we are a National High-Tech Enterprise with ISO 9001, ISO 14001 and ISO 45001 certifications, plus TS Special Pressure Certificate. Our 20+ national patents and software copyrights support a full range of hydraulic valve and HPU design.
Where Our Hydraulic Power Stations Are Used
From hydropower turbine inlet control and large-diameter water pipelines to thermal power ESD valves, pump stations, oil and gas pipelines, and chemical plants — our hydraulic power stations deliver reliable, explosion-proof, fail-safe valve actuation across critical industries.
Hydraulic control for turbine inlet and penstock valves. Two-stage closing — fast closing followed by controlled slow closing — helps reduce hydraulic shock and water hammer in the pipeline. Field-proven for stable, long-term performance with minimal maintenance.
Controlled actuation for large-diameter water pipeline valves. Built for long service life in the field, with stable operation and low maintenance even under frequent cycling and remote site conditions.
Reliable valve control for water transfer and pumping systems. Prevents backflow, protects pumps from reverse flow damage, and ensures safe, stable operation with minimal maintenance in unattended stations.
Project References
Nepal 78MW Power Plant
- Valve type: Hydraulic butterfly valve DN4000
- Actuator: Hydraulic Accumulator slow closing CXL250 // YX16F
- Control Power: AC415V
- Closing sequence: Fast + slow closing
- Pump nominal flow:46Ⅱ
- Accumulator: 80 L*6pc
- Control: PLC / local + remote
- Oil tank:1200L
- Motor power: 15kw
- Hydraulic oil: YB-N32、YB-N46
- Valve open time: 30s
Baotou Donghua Thermal Power Plant
- Actuator: YKD7x43-64
- Control Power: AC380V
- Closing sequence: Fast closing
- Accumulator: 4 L*1pc
- Oil tank:125L
- Motor power: 1.5kw
- Hydraulic oil: YB-N32、YB-N46
- Valve open time: 0.2-0.8s(Buffer time of 5 degree)
- FAT: Completed
- Main Overall Dimensions of Hydraulic Power Unit
- Layout drawing of HPU
- Hydraulic Principle Shematic Drawing
| Tank capacity (L) | L | W | W (with side-mounted accumulator) | H | H1 | A | B | d |
| 40 | 545 | 310 | 490 | 410 | 862 | 390 | 230 | 16 |
| 63 | 640 | 400 | 580 | 450 | 912 | 500 | 280 | 16 |
| 80 | 640 | 540 | 745 | 460 | 1230 | 520 | 420 | 16 |
| 125 | 770 | 560 | 810 | 520 | 1440 | 650 | 440 | 16 |
| 220 | 1040 | 640 | 890 | 620 | 1540 | 920 | 520 | 16 |
| 400 | 1200 | 700 | 950 | 730 | — | 1120 | 620 | 20 |
| 630 | 1300 | 800 | 1050 | 870 | — | 1220 | 720 | 20 |
| 800 | 1400 | 850 | 1300 | 940 | — | 1320 | 770 | 20 |
Note: For tank capacities of 400 L and above, the H1 dimension is not specified in the original table (shown as “—”).
A Hydraulic Power Unit supplies pressurized hydraulic oil to a hydraulic actuator. It typically includes a motor, pump, reservoir, hydraulic manifold, filtration and control components. For valve applications, the HPU provides the hydraulic power required to open, close or position the valve.
Hydraulic power unit selection depends on the valve actuator’s required torque or thrust, working pressure, oil volume, opening and closing time, operating frequency and site conditions. These parameters determine the required pump flow, pressure, motor power and accumulator capacity.
No. An accumulator is mainly required when the system needs stored hydraulic energy, emergency operation, power-loss protection, peak-flow assistance or pressure compensation. For critical valve applications, accumulator capacity should be calculated according to the actuator volume and required emergency cycles.
The response depends on the hydraulic circuit and valve safety requirements. A hydraulic power unit with an appropriately sized accumulator can provide stored hydraulic energy for emergency valve operation. The system can be designed for fail-open, fail-close or fail-in-position functions.
Yes. Our hydraulic power units can be configured to interface with the plant control system through a local control panel, PLC, RTU or other specified control interface. Depending on the hydropower plant’s automation architecture, the HPU can provide valve control remote commands, valve position feedback, hydraulic pressure, pump status, alarms and other operating signals to the unit or plant control system and, where applicable, to the central control room.