6-5
Catalogue HY11-3500/UK
Threaded Check Valves
Series RK, RB
6
RK-RB_UK.INDD RH 21.09.09
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Characteristics / Ordering Code
Technical data
Series design with pipe thread
The check valves are designed to go into simple, threaded
cavities. The connection is O-ring sealed on the 118°
shoulder in the mounting cavity.
Code RK0 RK1 RK2 RK3 RB1 RB2 RB3
Flow [l/min] 10 20 50 80 20 50 80
Operating pressure [bar] 700 700 700 500 700 700 500
Opening pressure [bar] 0.15 0.18 0.2 0.25 0.15 0.07 0.17
Thread (DIN ISO 228/1) G1/8A G1/4A G3/8A G1/2A G1/4A G3/8A G1/2A
Tightening torque* ±20% [Nm] 10 15 20 40 15 20 40
Weigh [g] 5 5 15 15 5 15 20
Mounting position unrestricted
Fluid Hydraulic oil in accordance with DIN 51524/51525
Viscosity permitted [cSt]/[mm²/s] 4...1500 ; opt. 10...500 viscosity recommended
Temperatures [°C] Ambient and oil -40...+80, observe viscosity range.
* In case of strong vibration, it is recommended to secure the mounting threads.
Type RK
Type RB
Check
valve,
screwable
Mounting
direction
Size
* only series RK available
Ordering code
Code
Mounting
direction
K
in the blocked
direction
B
in open flow
direction
Code Flow [l/min] Thread
0* 10 G1/8A
1 20 G1/4A
2 50 G3/8A
3 80 G1/2A
R
6-6
RK-RB_UK.INDD RH 21.09.09
Catalogue HY11-3500/UK
Threaded Check Valves
Series RK, RB
6
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Characteristics
Mounting direction
Type RK
Screwed in,
in the blocked direction
Screwed in,
in the open flow direction
Type D
2
a d
3
RK0 8.6 2 1.5
RK1 11.5 2.5 2
RK2 15 2 2.5
RK3 18.8 4 3.5
Mounting tool
Type RK
∆p/Q perfomance curves
Oil viscosity during measurement 50mm²/s
Type RB
All characteristic curves measured with HLP46 at 50°C.
6-7
Catalogue HY11-3500/UK
Threaded Check Valves
Series RK, RB
6
RK-RB_UK.INDD RH 21.09.09
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
1)
Thread runout x must be maintained. It may be smaller, but
not larger (requirement for a perfect seal using the O-ring).
2)
Fully cut-out thread
Mounting cavity
• forconnectingincombinationwithtubetting
• forinternallinechannels
Type Thread L l
1
d d
1
d
2
h d.c. O-ring
RK0 G1/8A 7.2 4 8.6 1.8 1.6 1.3 6.8 6x1
RK1 G1/4A 9 4.5 11.5 2.4 2.2 1.5 8.8
-0.1
9x1
RK2 G3/8A 11 6 15 3.2 3 2.5 11 11x1.5
RK3 G1/2A 13 7.5 18.5 4 3.8 3 14.2
-0.1
14x1.5
Type Thread L l
1
d d
1
h ww O-ring
RB1 G1/4A 9.8 5 11.6 2 1.3 5 9x1
RB2 G3/8A 11.5 7.0 15 2.8 2 6 11x1.5
RB3 G1/2A 13.15 7.5 18.5 3.2 2.5 8 14x1.5
Type Thread D D
1
t t
1
2)
x
1)
a
1
d
2
RK0 G1/8 8.7 5 12.3 10 2.3 9.5 5
RK1 and RB1 G1/4 11.8 8 14 11 3 11 6
RK2 and RB2 G3/8 15.25 9 17 14 3 13 8
RK3 and RB3 G1/2 19 12 22 18.5 3.5 16 12
Type Thread D D
1
t t
1
2)
x
1)
RK0 G1/8 8.7 5 16 13.7 2.3
RK1 and RB1 G1/4 11.8 8 22 19 3
RK2 and RB2 G3/8 15.25 9 24.5 21.5 3
RK3 and RB3 G1/2 19 12 29 25.5 3.5
Dimensions
Type RK Type RB
* Required depth depending on type of screw plug, connecting plate,
etc. used.
6-8
RK-RB_UK.INDD RH 21.09.09
Catalogue HY11-3500/UK
6
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Notes