Hydrolok Product Description

The Hydrolok® is a linear, hydraulic locking device consisting of a cylinder and piston. The piston has an integral valve and porting system. This design permits controlled transfer of hydraulic fluid from one side of the piston to the other side of the piston, within the cylinder. The swaged design of this product line offers a very low cost manufacturing. An additional reservoir chamber assures long life and consistent operation.

Typical Applications

• Hydrolok Brochure

  Seat recline for aircraft, bus, train, ferry,
  and office furniture
• Aircraft leg rest deploy

Features and Benefits

• Aircraft industry standard for over 40 years
• Infinite locking capabilities
• Smooth hydraulic dampened motion
• Controlled speed
• Variable override
• Large reservoir for long service life
• Anodized aluminum cylinder
• Hard chromed 4130 steel piston
• Available in sizes & cost parameters to suit commercial use.

Principle of Operation

Depressing the control rod opens the integral valve in the unit and allows the fluid to transfer between fluid chambers.

With a compressive load applied, the return spring force is overcome and the unit is compressed. The valve is closed by release of the control rod. The closed valve "locks" fluid in the fluid chambers and prevents further compression of the unit.

To return the unit to its extended position, depress the control rod to open the valve and remove the compressive load previously applied to the unit. The return spring force will automatically reset the unit to its fully extended position.

Release of the control rod at any position during compression or extension of the unit will result in locking the unit at that position.

The Hydrolok uses a hydraulic fluid which allows the unit to positively lock in any position to its full hydraulic rated load. The unit incorporates a mechanical spring which ensures consistent output force, regardless of a temperature changes and/or age of unit. A redundant fluid reservoir replenishes the small amount of fluid used to lubricate the sliding members, thereby assuring the longest service life in the industry.

The Hydrolok is equipped with a special override features which permits the unit to be returned to its fully extended position without actuation of the control rod. This override is affected anytime a large tension load is applied to the lock.

AL Series

• Compression lock which overrides in extension

• Maximum of 3 incremental different stroke (*) lengths + lock out

• Stroke limiter clip

• Must have 0.220 inches between stoke limits

• Maximum output force is 140 pounds

• Tamper proof requires snap ring tool to adjust stroke limits

HL Series

• Compression lock which overrides in extension

• Maximum of 3 incremental different stroke (*) lengths + lock out

• Stroke limiter clip

• Must have 0.220 inches between stoke limits

• Maximum output force is 140 pounds

• Tamper proof requires snap ring tool to adjust stroke limits

HV Series

• Compression lock which overrides in extension

• Infinite stroke capabilities

• Tamper proof requires snap ring tool to adjust stroke limits