Purchase now: Tokyo Keiki TGMC-3-BT-FW-50 Counterbalance Valve
Purchase now: Atlantech Drives provides you the Tokyo Keiki TGMC-3-BT-FW-50, a precision **Modular Counterbalance Valve** compatible with the ISO 4401-03 (NG6) interface. Unlike a simple relief valve, a counterbalance valve is designed to create back pressure in a hydraulic line to support a load. This specific model operates on the **B Line** («BT»), preventing vertical loads (like a press slide or a crane boom) from falling uncontrollably due to gravity when the directional valve is shifted.
Technical Specifications and Gravity Control
The **TGMC-3** valve ensures smooth motion control. The **»FW»** designation typically refers to the adjustment mechanism (e.g., a handle or screw with locknut) and the specific pressure adjustment range. By maintaining positive pressure in the B line, it prevents «runaway» conditions where the load moves faster than the pump flow, which would otherwise cause cavitation and loss of control. It also functions as a safety relief for thermal expansion in locked cylinders.
- Part Number: TGMC-3-BT-FW-50.
- Series: Modular Counterbalance.
- Size: NG6 / CETOP 3.
- Acting Line: Port B (Drain to T).
- Pressure Adj: Adjustable (Check spring range FW).
- Max Pressure: 25 MPa (Standard for MC series).
- Pilot Ratio: Internal pilot (assists opening).
- Adjustment: Screw/Knob with Locknut.
Expert Tips: Setting the Pressure
Setting a counterbalance valve requires care. Expert Tip: The setting should be approximately **30% higher** than the maximum load induced pressure. If you set it too low, the load will drift. If you set it too high, the system will generate excess heat and waste energy trying to push the load down. To set it: raise the load, turn the valve clockwise (increase pressure) until the load stops moving, then add a small safety margin.
Frequently Asked Questions (FAQs)
Q: Can I use this as a brake valve?
A: Yes, in hydraulic motor applications, a counterbalance valve on the return line acts as a brake valve to prevent the motor from over-speeding during deceleration.
Q: Where does the pilot signal come from?
A: In modular counterbalance valves, the pilot is usually taken internally from the opposite line (e.g., pressure in A helps open the valve in B) to lower the setting during operation.
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