Page 17 / 45
REV. STV20110519
3.
OPERATION
3.1 Pneumatically operated Valve
The pneumatically operated actuator type S-A is opened when pressurized and closed otherwise.
The pneumatically operated actuator type A-A is opened when the lower connection is
pressurized and closed when the upper connection is pressurized.
DANGER!
Always make sure that the surrounding system is de-pressurized before opening a
valve to atmosphere or non-pressure vessels. Negligence can result in personal injuries or
material damages.
3.2 Manually operated Valve
The handle is turned counterclockwise to open the valve and clockwise to close. The valve is not
suitable as a regulating valve, and should therefore not be set half-way open. Degree of opening
is visually displayed on the side of the handle.
When closing the valve be sure not to over tighten the handle.
The manually actuator with extension handled is opened by turning the handle counter-clockwise
and closed by turning it clockwise.
DANGER!
Always make sure that surrounding system is de-pressurized before opening a valve
to atmosphere or non-pressure vessels. Negligence can result in personal injuries or material
damages.
WARNING!
The handle will become hot if the valve is cleaned with hot liquid or sterilized with
steam or water. Use glove if the valve must be opened when the valve is hot.
3.3 Position indicators
When installed, the position indicators will indicate if the valve is closed or open by means of
sending an electric signal to a control panel. In some models, a red LED light will also provide a
visual indication that the valve is in the open position.
3.4 Cleaning
3.4.1 Internal cleaning
The valve is designed for Cleaning In Place (CIP) but can also be cleaned manually by
disassembling the parts and manually cleaning housing and diaphragm.
3.4.2 External cleaning
External cleaning is made according the customers standard procedures, designed for the selected
materials of the equipment.
