BIFFI OLGA-H High-Pressure Double-Acting Hydraulic Actuator

Terms and Conditions

Biffi guarantees that all the items produced are free of defects in workmanship and

manufacturing materials and meet relevant current specifications, provided they are

installed, used and serviced according to the instructions contained in the present

manual. The warranty can last either one year from the date of installation by the

initial user of the product, or eighteen months from the date of shipment to the initial

user, depending on which event occurs first. All detailed warranty conditions are

specified in the documentation forwarded together with the product. This warranty

does not cover special products or components not warranted by subcontractors,

or materials that were used or installed improperly or were modified or repaired

by unauthorized staff. In the event that a fault condition be caused by improper

installation, maintenance or use or by irregular working conditions, the repairs will be

charged according to applicable fees.

The warranty and Biffi liability shall lapse in the event that any modification or

tampering whatsoever be performed on the actuator.

Electrostatic Charge

An electrostatic charge risk is present on the actuator surface; in case of cleaning,

use only antistatic cloth; in case of maintenance, avoid all rubbing/frictions that could

electrostatically charge the equipment.

Noise Emission

The verification of the noise of the actuated valve is at valve maker care.

The actuator’s noise can be considered negligible since it is an equipment for regular

on/off or intermittent use. If the integral quick exhaust valve is present, we

recommend using ear Personal Protective Equipment (PPE) to avoid any possible

acoustic discomfort.

Introducing the Actuator

The hydraulic actuator series OLGA-H was engineered and is manufactured to provide

maximum torque output with minimum supply pressure. The OLGA-H actuators

are suitable for any quarter turn application such as ball, plug, butterfly valves or

dampers, in both on/off and modulating heavy-duty service.

The actuator (see Figure 4) is made up of a weatherproof scotch yoke mechanism

transforming the linear movement of the pneumatic cylinder (on closing or opening)

into the rotary movement, which is necessary for operation. The angular stroke of

the yoke is adjustable between 82° and 98° by means of the external mechanical

stops screwed into the left wall of the mechanism housing and into the end flange

of the pneumatic cylinder. The cover of the scotch yoke mechanism is arranged

for the assembly of the required accessories (positioner, signalling limit switches,

position transducer, etc.) by means of proper matching units. The above mentioned

accessories are operated by the actuator drive sleeve. The housing of the scotch yoke

mechanism has a flange with threaded holes to fix the actuator to the valve either

directly or, if required, with the interposition of an adaptor flange or a mounting

bracket. The actuator yoke has a hole with keyways suitable for the assembly of an

insert bush the internal hole of which is machined (by Biffi or at customer care),

according to the shape and dimensions of the valve stem. Biffi can supply different

types of control system following customer’s requirements.