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КГ-3У single-sided hydraulic lock

Intended for ensuring a single-way passage for working fluid flow and locking the reverse flow without control action applied; with control action applied – for dual-way fluid flow.

Implemented in hydraulic props of powered roof supports:

  • For feeding and closing the hydraulic props cavities in setting load mode.
  • For unloading head ends of hydraulic props during powered roof support units movement.
  • For locking and unloading head ends and rod ends of hydraulic advancing cylinders responsible for powered roof support units movement.
Main parameters КГ-3У
Internal diameter, mm 8
Nominal valve setting pressure, MPa 50
Nominal pilot pressure, MPa 10
Weight, kg 0,38

Working fluid

Installation and connecting dimensions

Any oil-water sludge permissible to use in coal mining facilities, with purity class grade 15 and higher according to GOST 17216, and industrial oils with the same purity class.

Developer: DONGIPROUGLEMASH Institute