HYDRAULIC ACTUATORS

The hydraulic actuators are driven by pressured hydraulic oil and controls opening and closing of ball- or butterfly valves installed in the pipe system of the vessel or rig.

The Skarpenord hydraulic actuators are produced as single- or double acting type and can operate all ball- and butterfly valves. The design simplifies maintenance and installation, which gives the customer a cost-effective product. Quarter turn actuators can be delivered with either adjustable stroke or fixed 90-degree rotation with mechanical locking*.

Actuators are made in Scotch-yoke design, piston type. Standard connection flange according to the ISO 5211. The material is nodular cast iron and carbon steel.

FACTS

*MECHANICAL LOCKING Skarpenord has delivered actuators with mechanical locking as standard on butterfly valves. RA models are equipped with a mechanical locking system in the end position of the stroke (open and close state). The mechanism is integrated in the actuator and totally independent of hydraulic oil pressure. If there is loss of hydraulic pressure, or even a fire, the valve will be kept safe in last position (open/close).

EASY MAINTENANCE The mechanical locking gives the feature of easy maintenance as well. The only regular maintenance we recommend on Skarpenord actuators, is changing of the seal kit. Because of the mechanical locking, the sealing can be replaced without any dismantling at actuator and valve. The actuator can remain attached to the valve and the valve does not have to be disconnected from the pipeline. The maintenance can be performed with the valve safely locked in fully closed or open position. Full flow can be maintained in the pipeline during maintenance.

EAL™ HYDRAULIC OIL Our Valve Remote Control (VRC) is also suited for use with various EAL™ hydraulic oil and can be used upon customers preference. This is premium quality, high performance hydraulic oils developed to meet the demand for environmentally acceptable hydraulic fluids. Contact Skarpenord for compatibility check.

HYDRAULIC ACTUATOR | SINGLE ACTING

Type: 1/4 turn hydraulic actuator RE2 – Spring-to-close-action RF2 – Spring-to-open-action

Max working pressure 220 bar Standard range torque up to 17800 Nm (Larger actuators on request) Service temperature -20 °C to +120 °C

Use area: For dry and submerged use. For submerged type a seal connection kit is added.

HYDRAULIC ACTUATOR | DOUBLE ACTING

Type: 1/4 turn hydraulic actuator RA2 – Mechanical locking RB2 – Adjustable stroke

Max hydraulic working pressure 220 bar Actuator torque range 69–240000 Nm Service temperature std -45 °C to +120 °C

All actuators can be coated on request depending on marine or offshore specification, or customer preference.

APPROVALS/STANDARDS

DNV GL

BV

ABS

CCS

NK

RMRS

OPTIONS Others on request.

A wide range of accessories is available for our actuators:

Local visual position indicator (Brass or AISI316)

Indicator boxes for use in hazardous areas

Connectors for emergency operation hand pump

All actuators can be coated on request depending on marine or offshore specification.

DOCUMENTATION Skarpenord’s own engineering department has long experience in documenting systems which meets our customers quality standards. We offer two tiers of documentation packages:

Skarpenord standard

Based on customer SMDL

Solenoid Valve Cabinets

The Solenoid Valve Cabinet (SVC) contains solenoid operated directional valves for distribution of high pressure oil to the actuators.

Valve position can be measured indirectly and communicated to the Skarpenord computerized valve control system, or superior system.

CABINET WITH DOOR IN FRONT – SEPARATED ELECTRO-HYDRAULIC AND ELECTRIC SECTIONS

Solenoid valves/others upon request 24VDC coils standard, others on request Solenoid valves mounted on manifold blocks in the rear of the cabinet Cable entrance through top or bottom side of the cabinet Hydraulic connections to actuators through back of cabinet Isolation valve and quick connectors for hand pump for emergency operation of the system Filter unit in pressure line