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HLAC Hydraulically Operated Access Covers

HLAC Hydraulically operated access covers Operated by single or double acting hydraulic cylinders. Powered by hand operated or electrically driven pumps. Individual Control systems and local control or Ring main hydraulics and centralised operating stations. System pressures around 100 bar for Hand pump systems and 200 bar for electrically driven systems. Tailored Hydraulic solutions for customer needs.

Electrical Control Systems

All SURESPAN powered access covers can be supplied with appropriate control boxes and ancillary pushbuttons, key switches position sensors.
24 v dc actuators suitable for 110v to 230 ac power supplies.
With or without Emergency battery back up power supplies.

Self Contained Plug in systems

Systems suitable for connecting into BAS or FMS systems.

Remote wireless operation

Pushbutton, Key Operated, automatic opening/closing from remote sensors.

Programmed sequences and interlocks

Individual Control boxes or system control boxes for as many access covers as necessary.

Tailored Electrical Solutions to meet customer needs.

First image - FACTA Class D, hydraulically operated, HIAC double leaf hatch 3100 x 2000 for St.Barts Hospital in London.


Any Surespan cover can be designed as a hydraulically operated unit, however it is more practical for larger and heavier access covers. The cover is designed and supplied with hydraulic cylinders fitted between the coaming frame and the underside of the lid. In general we use single action pushing units to open the cover but they may be designed as double acting if the geometry of the cover dictates the need. Whilst each unit is individual, our entry level, standard configuration of cover consists of; • Hydraulic cylinders operated by a manual hand pump. The hand pump is generally portable with a quick release connection point at the top of the lid via our locking box unit. • Our electro hydraulic units have an additional small electrically driven pump and control unit that allows push button or key switch operation of the cover. The unit is supplied generally in an enclosure for floor mounting depending on the size of the tank assembly. It is also supplied with electrical starting control and associated electrical control gear. These arrangements are common for single covers. For multiple cover applications and depending on the location of each cover, a central control point and centralised hydraulic pack can be supplied to operate multiple covers. This should be discussed at the initial stage of enquiry.

Any Surespan cover can be designed as a hydraulically operated unit, however it is more practical for larger and heavier access covers. The cover is designed and supplied with hydraulic cylinders fitted between the coaming frame and the underside of the lid.

In general we use single action pushing units to open the cover but they may be designed as double acting if the geometry of the cover dictates the need. Whilst each unit is individual, our entry level, standard configuration of cover consists of;

• Hydraulic cylinders operated by a manual hand pump. The hand pump is generally portable with a quick release connection point at the top of the lid via our locking box unit.

• Our electro hydraulic units have an additional small electrically driven pump and control unit that allows push button or key switch operation of the cover. The unit is supplied generally in an enclosure for floor mounting depending on the size of the tank assembly. It is also supplied with electrical starting control and associated electrical control gear.

These arrangements are common for single covers. For multiple cover applications and depending on the location of each cover, a central control point and centralised hydraulic pack can be supplied to operate multiple covers. This should be discussed at the initial stage of enquiry.

Hydraulic Schematic

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(Image Left) - Existing cover removed to be replaced by a Surespan, multi leaf, hydraulically operated HLAC. This particular cover is an SAC rated to FACTA class D loading.