DHF08‑221‑00 Normally‑Open Threaded Cartridge Valve
Product Overview
DHF08‑221‑00 is a 08‑size normally‑open screw‑in cartridge solenoid valve for hydraulic system. It adopts threaded cartridge installation structure. When the coil is de‑energized, the valve stays open and the oil passage keeps connected; when energized, electromagnetic force drives the spool to cut off the oil flow. Widely used in hydraulic power units, lifting equipment, agricultural machinery, automated fixture circuits and mobile construction machinery for hydraulic on‑off control.
DHF08‑221‑00 Normally‑Open Threaded Cartridge Valve is an electromagnetic switching Hydraulic valve. As a screw-in CARTRIDGE VALVE, it acts as a vital automatic control component within the hydraulic system. This threaded CARTRIDGE VALVE can be directly mounted into integrated manifold blocks, simplifying complicated external piping and making the whole hydraulic system more compact. This Hydraulic valve stays in the open channel state when de-energized. Upon energization, it closes the oil passage to achieve circuit cut-off, meeting diverse automatic control requirements of industrial and mobile machinery hydraulic system.
Main Technical Parameters
Item Specification
Model DHF08‑221‑00
Valve cavity size 08 series standard cartridge cavity
Function type Normally‑Open
Max working pressure 210 bar
Rated flow 30 L/min
Coil voltage DC12V / DC24V / AC220V optional
Installation form Screw‑in threaded cartridge, mounted inside manifold block
Seal material NBR O‑ring, FKM optional
Hydraulic fluid Anti‑wear hydraulic oil ISO‑VG32 / VG46
Operating temperature ‑10℃ ~ +70℃
Oil filtration requirement ≤25 μm
Working Principle
1. Power‑off status (normal condition): The spring keeps the spool in open position, the oil ports are connected, hydraulic oil can circulate freely.
2. Power‑on status: Electromagnetic force overcomes spring preload, pushes the spool to move, closes the valve orifice and cuts off the oil passage.
3. When power supply is disconnected again, spring force resets the spool, and the valve returns to normally‑open state automatically.
Core Advantages
1. Compact screw‑in cartridge structure, embedded installation in manifold block, saves installation space and simplifies external pipeline layout.
2. Stable switching performance, fast response speed, small pressure drop under rated flow.
3. The coil is independently replaceable. Field maintenance can be done without removing the whole valve from the manifold block.
4. Matches universal 08‑size cartridge valve cavity, good interchangeability for aftermarket replacement.
5. Suitable for control logic that requires oil‑path conduction under power‑off condition.
Typical Application
Hydraulic power packs, lifting platforms, agricultural machinery, special‑purpose equipment, fixture clamping circuits. Applied for hydraulic oil‑path on‑off control, especially for circuits requiring open channel when power fails.
