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3 Product description
gland packing providing low-maintenance and reliable valve
spindle sealing even after a long service life. A wiper ring fit-
ted in front of the gland packing protects the seal against con-
tamination and damage.
3.3 Function
The product controls a flowing medium by being closed or
opened by a control medium.
The product has an optical position indicator as standard. The
optical position indicator indicates the OPEN and CLOSED po-
sitions.
Open position Closed position
Fig.2: Optical position indicator
3.4 Control function
The following control functions are available:
Control function 1: Normally closed (NC)
Control function 2: Normally open (NO)
Control function 3: Double acting (DA)
3.5 Flow direction
The flow direction is indicated by an arrow on the valve body.
2/2-way body 2/2-way body
under the seat over the seat
under the seat
over the seat
Angle valve bodyAngle valve body
Over the seat
(code M)
Under the seat
(code G)
Under the seat (code G) is the preferred flow direction with in-
compressible liquid media to avoid water hammer
Over the seat (code M) only with control function - Normally
closed (NC)
3.6 Vent hole in the actuator
To vent the control medium, the pneumatic actuator has a
vent hole that is located on the side of the actuator housing
(control function normally closed). In certain areas of applica-
tion (e.g. the foodstuff industry), dirty water or cleaning media
could enter through this vent hole and penetrate the actuator,
thereby adversely affecting correct operation. A special vent
system with lip check valve is available for these applications,
which prevents such functional impairment.The vent hole at
the side is then closed.
Standard vent hole Special vent system K-no.
6996
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