A high-pressure hydraulic actuator is only as productive as the power pack driving it. When operating high-tonnage cylinders or continuous-duty torque wrenches, pairing the tool with an appropriately engineered 700 Bar (10,000 PSI) hydraulic pump determines cycle speed, thermal stability, and job-site compliance.
1. The Two-Stage / Three-Stage Flow Principle Explained
Standard 700 Bar hydraulic pumps do not deliver a constant volume across all pressures. To maximize speed without stalling motors, pumps utilize automated pressure-sensing flow stages:
- First Stage (Low Pressure / High Flow ~70 Bar): Delivers high flow (up to 8 - 10 L/min) to rapidly advance the cylinder piston or rotate the torque wrench ratchet into initial contact with the workpiece.
- Second Stage (Transition Flow ~350 Bar): Bridges speed and power during load pickup.
- Third Stage (Ultra-High Pressure / Low Flow up to 700 Bar): Automatically down-shifts fluid volume (0.8 - 1.2 L/min) while generating maximum hydraulic clamping pressure up to 700 Bar with precise relief valve accuracy.
2. Electric Power Packs vs. Pneumatic Air-Driven Units
Selecting between electric and air-driven hydraulic pumps depends on power source availability, duty cycles, and explosion safety classification:
| Evaluation Parameter | Electric Hydraulic Pumps (HTW-P4E) | Air Hydraulic Pumps (HTW-PA / HPA) |
|---|---|---|
| Power Input | 110V / 220V 1-Phase or 380V 3-Phase | Compressed Air (4 - 8 Bar, 60-120 PSI) |
| Hazardous Zone Suitability | Requires explosion-proof motor housing | Inherently 100% Spark-Free / ATEX safe |
| Continuous Duty & Thermal Limits | High efficiency with integrated fan radiators | Self-cooling via expanding exhaust air |
| Simultaneous Tool Capacity | Up to 4 tools (4-port manifold block) | 1 to 2 tools depending on air CFM flow |
3. Multi-Tool Simultaneous Operation for Uniform Flange Make-Up
When torquing large diameter flanges (e.g. 24" to 60" ASME flanges), operating a single torque wrench sequentially risks pinching the gasket. The HTW-P4E Series pump features an integrated 4-port hydraulic manifold that drives four torque wrenches synchronously across opposite quadrants (180° pattern), guaranteeing perfect parallel gasket compression and cutting bolting cycle time by 75%.
HydraStark High-Pressure Power Pack Units
Review calibrated electric and pneumatic pump models rated to 700 Bar: