ESD series electro-hydraulic proportional flow directional control valve

ESD series electro-hydraulic proportional flow directional control valve

1. Product positioning and core functions

Product type: Electro hydraulic proportional flow+directional control valve, integrating traditional four-way solenoid valve and DC solenoid, while achieving directional switching and high-speed flow control.

Applicable scenarios: Remote control of hydraulic systems, shock free acceleration and deceleration control, simplifying hydraulic circuit configuration.

Specification series:

Direct acting: ESD-G01

Pilot type: ESD-G03, ESD-G04, ESD-G06

2. Core technical parameters

Parameter item ESD-G01 ESD-G03 ESD-G04 ESD-G06

Maximum working pressure 25MPa 25MPa 25MPa 25MPa 25MPa

Rated flow rate 10/20L/min 40/80L/min 140L/min 250L/min

Maximum flow rate 25L/min 100L/min 140L/min 250L/min

Pilot pressure - ≥ 1.0MPa ≥ 1.0MPa ≥ 1.0MPa

Response time 0.04s 0.05s 0.08s 0.1s

Rated current 850mA 850mA 850mA 850mA

Hysteresis ≤ 5% ≤ 5% ≤ 5% ≤ 5%

Weight 2.2kg 7kg 9.2kg 15kg

3. Key usage and installation requirements

Exhaust operation: Release the exhaust valve to release air before operation to ensure stable control.

Installation direction: The valve core axis should be installed horizontally.

Manual adjustment: Rotate the manual screw clockwise to increase the pressure, and under normal circumstances, it needs to be completely turned left.

Oil requirements: Oil temperature * * -20~70 ℃, kinematic viscosity 12~400mm ²/s * *, recommended 15~60mm ²/s.

Pollution control: The oil pollution level should not be lower than level 9, and it is recommended to install an 8 μ m filter.

Pilot pressure limit: When the pilot pressure of G03/G04/G06 exceeds 9MPa, a pressure reducing valve should be installed with a setting of 2MPa.

4. Structure and configuration characteristics

Valve core types: Provides various valve core forms such as C5, C6S, etc.

Pilot/Drain Switching: Supports free switching between inner pilot/outer pilot and inner drain/outer drain.

Auxiliary symbol G: Integrated modular pilot pressure reducing valve, with a height increase of 40mm.

Installation standard: The sealing surface size complies with ISO 4401 standard.

5. Installation and Accessories

Installation bolts (example):

G01: M5 × 45, 4 pieces, torque 5~7N · m

G03: M6 × 35, 4 pieces, torque 10~13N · m

G06: M12 × 60, 6 pieces, torque 60~70N · m

Sealing kit: Each specification is equipped with a dedicated O-ring sealing package, and the material complies with JIS B2401.

Pressure compensation package: JHF series compensation valve components enhance high pressure/high-precision control performance.

6. Performance characteristics

Current flow characteristics: The flow rate is proportional to the input current, with a rated current of 850mA.

Pressure flow characteristics: Under constant current, the flow rate shows a stable curve as the valve pressure difference changes.

Key questions and answers

Question 1: What is the core control principle and specification division of ESD series valves?

Answer: The ESD series achieves direction switching and flow rate proportional control by inputting current through a DC proportional electromagnet; Divided by structure into direct acting G01 and pilot operated G03/G04/G06, with a rated flow rate covering 10-250L/min and a maximum working pressure of 25MPa.

Question 2: What are the key requirements that must be followed during the installation and use of ESD valves?

Answer: 1 Exhaust must be carried out before operation to ensure stable control; 2. The valve core needs to be installed horizontally; 3. The degree of oil contamination shall not be lower than level 9; When the pilot pressure exceeds 9MPa, a 2MPa pressure reducing valve must be installed; 5. Manually adjusting the screw normally requires complete left rotation.

Question 3: How can ESD valves switch between pilot/drain modes, and what components are required for high-precision control?

Answer: By plugging or opening the corresponding oil port with an internal hexagonal plug, the internal/external pilot and internal/external oil can be switched; For high-precision flow control or under high-pressure conditions, it is recommended to use JHF series pressure compensation valve components.