Bypass Valve0 pages

APPLICATIONS
Bypass valve type GA is intended for use as a pressurerelief
valve in hydraulic systems, oil circulation circuits, oil
firing systems, etc.
The valve is intended for mineral oils and liquids with similar
properties and must not be used for water, steam, corrosive
liquids or the like.
MODE OF FUNCTION
Bypass valve type GA is direct-acting and is distinguished
by its high speed during the opening process, enabling
pressure surges in the event of sudden changes in volumetric
flow to be kept at a low level.
The valve features a built-in, automatically acting hydraulic
pressure compensation device which endeavours to keep
the pressure rise as small as possible within the flow rate
range area specified for the valve (cf. pressure rise in response
to increasing flow for a purely spring-loaded valve)
During the closing process, the pressure largely coincides
with the pressure during the opening process. For fine
adjustment of the valve characteristics, the valve is provided
with a throttling screw at the outlet which, upon delivery, is
factory set and which does not usually require subsequent
adjustment.
VERSIONS
The bypass valve type GA is available in the following
versions:
GAR with valve casing for threaded pipe connections
GAS with valve casing for SAE-flanged pipe connections
GAD with valve casing for DIN-flanged pipe connection
Model Code
Valve series
M o d e l
R = Threaded pipe connections
S = SAE-flanged pipe connections
D = DIN-flanged pipe connections
Size (size code according to type specification overleaf)
Design specification (upon deviation from standard design - 0 indicates
standard design)
Design modification (1 - indicates original design)
Valve spring (code according to type specification overleaf)
or
Special variant (max. opening pressure determined by the variant)
Example: GAS 04001 T040, valve with SAE-flanged connections dia. 40 mm in standard design with spring for
max. 4.0 MPa opening pressure.
G
GA 1102 GB
A
MATERIAL
Valve casing - steel for types GAR and GAS
- nodular iron for type GAD
Spring casing - steel for sizes 012, 015, 020, 034
- nodular iron for sizes 025, 040, 065, 100, 112
O-rings - Viton rubber
Other parts - steel
Bypass Valve GA
Type
Max pressure: 10 MPa
Max flowrate: 15 dm3/s (900 I/min)
GA 1102.02 GB