Purchase now: Tokyo Keiki DG5V-7-6C Pilot Operated Valve
Purchase now: Atlantech Drives provides you the Tokyo Keiki DG5V-7-6C-T-M-U-H7-50, a heavy-duty **Pilot Operated Directional Control Valve**. This is a two-stage valve: a smaller pilot valve (DG4V-3) sits on top and hydraulically shifts the large main spool. The **»DG5V-7″** size corresponds to **ISO 4401-07 (NG16)**, capable of handling high flows (approx 300 L/min) for large presses and injection molding machines. The **»6C»** spool is the classic «Motor Spool» (P blocked, A & B to T in center), allowing actuators to float or motors to coast to a stop.
Technical Specifications and Pilot Logic
The system is configured with **Internal Pilot («T»)** and Internal Drain (standard unless «E» is specified). The **»H7″** code likely refers to the **200/220 V AC** pilot valve coils. It includes a **Manual Override («M»)** for testing and emergency operation. The main stage is spring centered, meaning if pilot pressure is lost, the valve returns to the Type 6 neutral position.
- Part Number: DG5V-7-6C-T-M-U-H7-50.
- Size: NG16 / CETOP 7.
- Type: Two-Stage (Pilot Operated).
- Spool: Type 6 (Open Center A-B-T).
- Pilot Supply: Internal.
- Pilot Drain: Internal.
- Voltage: 200/220 V AC (H7 code).
- Max Flow: >300 L/min.
- Pressure: 35 MPa.
Expert Maintenance Tips: Pilot Pressure
Pilot valves need minimum pressure to shift the main spool. Expert Tip: Since this uses a Type 6 spool (Open Center A-B-T), the P port is blocked in neutral, so pressure is available for the pilot. However, if you use a Type 0 or 2 Open Center pump system, you might need a back-pressure check valve (cracking valve) in the P line to ensure there is always at least 5 Bar available to shift the pilot, otherwise the main valve will act sluggishly or fail to switch.
Frequently Asked Questions (FAQs)
Q: What does «Two-Stage» mean?
A: It means the solenoids don’t push the big spool directly (too heavy). They push a small hydraulic spool, which sends oil to push the big spool.
Q: Can I change it to External Pilot?
A: Yes, usually by removing a plug inside the main valve body (check the service manual). This is necessary if your main system pressure drops to zero frequently.
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