DHF08‑220H Normally‑Closed Threaded Cartridge Valve with Manual Override
Product Overview
DHF08‑220H is a 08‑size normally‑closed screw‑in cartridge solenoid valve for hydraulic system. It adopts threaded cartridge installation, built‑in manual override function for emergency operation when power is off. When solenoid is de‑energized, the valve remains closed to cut off oil passage; upon energization, the spool acts to open the flow path for hydraulic oil circulation. Widely used in hydraulic power unit, lifting platform, engineering machinery, agricultural machinery and automated hydraulic equipment.
DHF08‑220H Normally‑Closed Threaded Cartridge Valve is an electromagnetic switch Hydraulic valve. As a screw-in CARTRIDGE VALVE, it serves as an essential automatic control component in the hydraulic system. This threaded CARTRIDGE VALVE can be directly installed into integrated manifold blocks, removing cumbersome external pipelines and making the whole hydraulic system compact and orderly. As a normally closed type Hydraulic valve, it keeps the oil circuit disconnected under power-off status, and realizes rapid channel switching after energization to satisfy automatic control demands of the hydraulic system.
Main Technical Parameters
Item Specification
Model DHF08‑220H
Valve cavity size 08 series standard cartridge cavity
Function type Normally‑closed, with manual override
Max working pressure 210 bar
Rated flow 30 L/min
Coil voltage DC12V / DC24V (optional)
Installation form Screw‑in threaded cartridge, installed inside manifold block
Seal material NBR O‑ring
Hydraulic fluid Anti‑wear hydraulic oil ISO‑VG32 / VG46
Operating temperature ‑10℃ ~ +70℃
Filtration requirement ≤25 μm
Working Principle
1. Power‑off status (normal condition): The spring pushes the spool to keep valve closed, oil flow is cut off between ports.
2. Power‑on status: Electromagnetic force overcomes spring resistance, drives spool to move, opens the oil passage, hydraulic oil flows through the valve.
3. Manual override function: Under power‑failure situation, press or turn the manual knob to mechanically push spool open, realize temporary oil‑way conduction for emergency maintenance or load lowering. After releasing, it automatically resets to normally‑closed state.
Core Advantages
1. Compact screw‑in cartridge structure, embedded installation in manifold block, save space, simplify pipeline layout.
2. Equipped with reliable manual override, support emergency operation during power loss.
3. Fast response, stable switching performance, low pressure loss when opening.
4. Replaceable coil, easy on‑site inspection and maintenance without removing the whole valve from manifold.
5. Interchangeable with standard 08‑size cartridge valve cavity, good universality.
Typical Application
Hydraulic power pack, scissor lifting table, small lifting machinery, agricultural machinery, special engineering equipment, fixture hydraulic circuit. Used for oil‑path on‑off control and emergency manual release.
