Hydraulic Locks VZD and HZD

Hydraulic locks are designated for fixation of positions and statuses of hydraulic devices (hydro engines) upon interruption of the supply of work fluid. They also function as a safety element in the event of a defect in the hydraulic system – this is a prerequisite for all lifting technology.

Technical data:
Name and symbol	Units	Value
Work pressure pn	MPa	max 20
Work fluid	OT-H2, OT-H3 ON1, ON3, OL-N3
Range of work fluid temperature	ºC	-20 to 80
Range of work environment temperature	ºC	-20 to 55
Nominal work fluid filtration	um	25
Mean technical life	cycles	2,5x10⁶
Mean life before default	cycles	0,8x10⁶
Opening pressure of non-stressed lock: - from intake to outlet	MPa	max 0,15 max 0.50
Nominal flow rate: - VZD 10 - VZD 16 - VZD 20	dm³.s_¹	0.32 1.00 1.50
Maximum flow rate: - VZD 10 - VZD 16 - VZD 20	dm³.s_¹	0.50 1.25 2.00
Climatic endurance as per ČSN 03 88 05		TH 1
Weight: - VZD 10 - VZD 16 - VZD 20	kg	1.72 3.94 8.00

Hydraulic Lock HZS

This device closes perfectly the work circuit under pressure, secures the level of stress, if declining due to a pipe failure, and keeps a stable position of hydraulic cylinders under pressure even for extended time intervals. It is delivered in three versions:

- double-sided lock

- one-sided lock with a valve in branch 1

- one-sided lock with a valve in branch 2

Technical data:
Name and symbol	Units	Value
Nominal clearance	mm	6
Nominal flow rate	l/min	20
Work pressure	MPa	25
Work fluid	mineral oil
Range of work fluid temperature	°C	- 20 to 80
Range of work environment temperature	°C	- 20 to 55
Nominal work fluid filtration	um	25
Opening pressure of non-stressed lock	MPa	max.0.4
Range of work fluid viscosity	m².s^_¹	10 - 400