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070011E0 pages
700-11
Issue 02-13*
CHECK VALVES
without/with pilot control, hydraulic pilot operated, pmax. 500 bar
Describtion:
These hydraulic check valves are part of the
spring loaded shut-off valves. The check
valves serve for blocking the supply line
in the application of leak-free hydraulic
cylinders in combination with low leaking
directional valves.
The pressure drop in the consumer line
takes place gradually. This prevents from
decompression shocks and preserves the
connected hydraulic elements.
Operating conditions:
By their design with manifold connection
the check valves without/with pilot control
facilitate fixtures without piping.
Functionality:
The flow B→A is permanently open. In the
opposite direction A→B the flow is locked.
It can be unlocked by pressurizing the control
port Z. The minimum pressure for that
depends on the pressure load at port A.
The check valve with a capacity of 20 l/min
is not equipped with a pilot control.
The valve with a capacity of 50l/min is
optional available without or with pilot control.
In application with higher pressure and
volume flow we recomment check valves
with pilot control.
The pilot control is effected by unlocking a
seat valve in the main valve piston. Thereby
a lesser control pressure is required to unlock
the flow.
By using a pilot control also clamping
cylinders with unfavorable area ratio can
be used.
Uncoupled machine parts e.g. pallet systems
can be kept pressurized by using these
shut-off valves.
Important notice:
Faults can occur in the pressure ratio if the
pressure load is too low to unlock the valve.
This can effect dangerous malfunctions when
decompressing swing clamp cylinders and
pull cylinders.
Such clamping cylinders must be operated
with check valves equipped with pilot control.
These valve types are designed for a much
lower control pressure.
To relieve the piston chamber, a drain
connection is required. This must be
protected from ingress of dirt and liquids.
Webcode: 070011
Other designs
are available
on request
A
L
Z B
Advantages:
Installation without piping
Pilot control prevents from
decompression shocks
Allows pressure maintenance
at uncoupled machine parts
Schematic symbols:
L
A
Application example:
Z
B
A
Without pilot control
With pilot control
L
L
A
(1)
(2)
80
(3)
0
0
100
200
300
400
500
Pressure pA = [bar]
(1) Order no. ERSV-500-5-003
(2) Order no. ERSV-500-8-001
(3) Order no. ERSV-500-8-002 (with pilot control)
Ressistance to flow ∆p [bar]
Minimum pressure pZ [bar]
14
40
B
∆p-Q nominal line
200
120
B
Z
Minimum pressure pZ to unlock
at pressure pA (pB = 0 bar)
160
(Z)
(1)
(2)
+
(3)
12
A
B
10
b
a
8
14
12
6
P
4
2
T
HYDROKOMP
®
0
0
10
20
30
40
50
Hydraulische Komponenten GmbH
Flow rate Q [l/min]
Oil viscosity at measurement
60 mm²/s
700-11 / 02-13 *Subject to change without notice, compare issue no. at www.hydrokomp.de.
Siemensstraße 16, 35325 Mücke (Germany)
Phone: +49 6401 225999-0
Fax:
+49 6401 225999-50
E-mail: info@hydrokomp.de
Internet: www.hydrokomp.de
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