Ningbo Songee Hydraulic Technology Co., Ltd.
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Plate-Type Bidirectional Hydraulic Lock

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Plate-Type Bidirectional Hydraulic Lock

Overview

The plate-type bidirectional hydraulic lock is a pilot-operated check valve designed to securely lock hydraulic actuators in both directions.

It prevents load drift and ensures safe, reliable holding of cylinders and motors even under high pressure.

Main Features

  • Bidirectional locking for double-acting systems
  • Pilot operated for smooth and reliable release
  • Compact plate-type design for easy installation
  • Hardened internal parts for long service life
  • Ideal for load holding and safety applications

Dimension Key

LLength
HHeight
WWidth
P1Pilot Port V1
P2Pilot Port V2

Models and Specifications

ModelMax PressureFlow RatePilot Ratio (P1:P2)Port Size (V1, V2, P1, P2)Weight
PTBL-320-10320 bar10 L/min4.5:1G1/4″1.4 kg
PTBL-320-12320 bar12 L/min4.5:1G3/8″1.4 kg
PTBL-320-15320 bar15 L/min4.5:1G1/2″1.4 kg

Note: Specifications are based on mineral oil with a viscosity of 32 cSt at 40°C.

Applications

  • Cylinder load holding in vertical applications
  • Preventing load drift in hydraulic systems
  • Hydraulic presses and clamping systems
  • Crane, hoist and lifting equipment
  • Mobile hydraulics and construction machinery

Notes

  • Pilot pressure is required to open the valve
  • Ensure the pilot pressure ratio meets or exceeds the required pilot ratio
  • Keep hydraulic oil clean to extend service life
  • Install as close to the actuator port as possible
  • Do not exceed the maximum pressure rating
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