10
10-45
Hydraulically Pilot Operated Check Valve
Series RH
RH UK.indd CM 11.11.14
Characteristics / Ordering Code
Pilot operated check valves series RH allow free flow in
one direction (B to A). The counter flow is blocked (A to
B). By applying pilot pressure the ball can be lifted from
its seat and allow flow from A to B.
Most common use:
• Keepingcylindersleak-freeinposition,whenspool
type directional control valves are used
• Returnlinedischarge,whenreturnowexceedsfunc-
tional limits of directional control valve at differential
cylinders
• Ashydraulicallyactivateddrainorcirculationvalve
The valves are available without and with hydraulic pre-
discharging.
Without pre-discharging
Thesevalveshaveaballasvalveelement,whichquickly
enables the full flow cross-section proportionally during pi-
lot operation. A metering position in the pilot port dampens
the control movement of the pilot spool so that pressure
shocks (unloading shocks) are mostly suppressed.
With pre-discharging
For valves with pre-discharging a spherical polished valve
spool (seat valve function) is built-in instead of a ball. The
additional check valve achieves a pre-opening which
providesshock-freeunloadingoftheuid,especiallyat
high working pressure and large volumes.
Connection for
pilot line
Connection for
pilot line
1)
Only for sizes 3 and 4
Ordering code
RH
Check valve,
hydr. pilot
operated
Flow
Code
Pre-discharging
V
1)
with
omit
without
Code
Flow [l/min]
1
15
2
35
3
55
4
100
Pre-
discharging
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
10
10-46
Hydraulically Pilot Operated Check Valve
Series RH
RH UK.indd CM 11.11.14
Pilot pressure p
St
for pilot operation of the main valve
(p
B
= 0 bar)
Pilot pressure p
St
for pilot operation of pre-discharging
50
40
30
20
10
0
RH3V
RH4V
0 100 200 300 400 500
Pressure p at port A [bar]
Pressure p
ST
[bar]
Technical Data
for keeping open
p
St
p
B
+ ∆p + k
p
B
[bar] pressure on side B
∆p
[bar] flow resistance A to B as per ∆p/Q performance curve
k
10 at RH 1 and RH 2
7 at RH 3 V
8 at RH 4 V
General
Code RH
1 2 3 / 3V 4 / 4V
Pipeconnections DINISO228/1A,B
DIN ISO 228/1 Z
G ¼
G ¼
G ⅜
G ¼
G ½
G ¼
G ¾
G ¼
Mounting Freely suspended in the pipeline
Mounting position unrestricted
Ambient temperature [°C] -20 ... +60
MTTF
D
value [years] 150
Weight [kg] 0.4 0.4 0.6 1.3
Hydraulic
Max.operatingpressure [bar] 700 700 500 500
Flowapprox. [l/min] 15 35 55 100
Pilot flow volume [cm³] 0.15 0.22 0.4 1
Fluid Hydraulic oil according to DIN 51524
Fluid temperature [°C] -20...+70
Viscosity permitted
recommended
[cSt]/[mm
2
/s]
[cSt]/[mm
2
/s]
20...400
30...80
Technical data
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
10
10-47
Hydraulically Pilot Operated Check Valve
Series RH
RH UK.indd CM 11.11.14
Characteristic Curves / Dimensions
Type
Port
1)
L a b SW
A, B Z
RH 1 G ¼ G ¼ 84 31.5 27 24
RH 2 G ⅜ G ¼ 90 32 28.5 27
RH 3 V G ½ G ¼ 100 36.5 31 32
RH 4 V G ¾ G ¼ 126 45 35.5 41
1)
AsperDIN228/1,suitableforpipeconnectionswiththreadstudsformBasperDIN3852page2.
Performance ∆p/Q curves (valid for flow polarity B to A and pilot operated direction A to B)
Opening pressure B to A 0.2...0.3 bar
Oilviscosityduringthemeasurement,60mm²/s
Forviscositiesoverapprox.500mm²/s,astrong∆p-increase
istobeexpectedforsmallertypes(RH1...RH3).
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group