Pipe Rupture Valves
Q
max
= 580l/min [153 gpm],p
max
= 350bar [5000 psi]
Seat valve as screw-in cartridge or mounted in a body
Series RS…-P-… / RS…-W-…
1/7
Reference: 300-P-9050071-EN-03
Issue: 12.2024
S Nearly leak-free closure
S Closing flow rate is adjustable
S Simple pipework installation
S Compact design means small space requirements
S Available as a cartridge or in a block body
S Exposed parts with burnished finish
1 Description
Series RS…-P-… / RS…-W-…, pipe rupture valves, which
belong to the safety valves group, are available as screw-in
cartridges or as a body-mounted design. Pipe rupture
valves are used wherever a load must not be allowed to
drop rapidly and without control if a pipe or hose bursts (ex.
uncontrolled movement of the cylinder). In its normal posi
tion the pipe rupture valve is open and allows the flow in both
directions. When the actuating flow rate is exceeded – by a
hose burst, for example – the pipe rupture valve closes sud
denly and blocks flow form Z to P. The pipe rupture valve
opens again automatically when the pressure at port P is
higher than the pressure at port Z.
2 Symbol
Z
P
3 Technical data
General characteristics Description, value, unit
Designation Pipe Rupture Valve
Design Ball/seat valve
Mounting method Screw-in cartridge or mounted in a body
Tightening torque See section 6, Dimensions & sectional view
Size 08, 12, 16, 20, 25 and 32
Weight See section 6, Dimensions & sectional view
Mounting attitude unrestricted
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
2/7
Description, value, unitGeneral characteristics
Ambient temperature range -20°C … +80°C [-4 °F … +176 °F]
(others on request)
Surface corrosion protection burnished
Hydraulic characteristics Description, value, unit
Maximum operating pressure
size 08, 12, 16, 20, 25
size 32
350bar [5000 psi]
300 bar [4300 psi]
Minimum adjustable actuating flow rate (size 08) 5l/min [1.3 gpm]
Maximum adjustable actuating flow rate (size 32) 580l/min [153 gpm]
Flow direction P → Z, free flow
Z → P, no-flow direction
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -20°C … +80°C [-4 °F … +176 °F]
Viscosity range 10…650mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
IMPORTANT!: The set closing volume flow must
be at least 40% above the maximum operating
flow rate.
4 Construction and function
1. When oil flows through from Z → P, if the pressure differ
ence in the valve rises above the preload value (approx.
1 bar), then the ball is pressed against the valve seat
and shuts off the flow cross section.
2. The pipe rupture valve opens again automatically when
the pressure at port P is higher than the pressure at port
Z.
ATTENTION!:
Due to their very high closing speed, these prod
ucts are not suitable for applications that include
the transportation of people. The activation of the
pipe rupture valve produces very large decelera
tions that can have adverse health effects.
Notes on setting the closing flow rate
Screw in the adjusting ring until the ball is resting on the seat
→ basic position.
Set the required closing flow rate by unscrewing (anticlock
wise) the adjusting ring back from the basic position.
(Diagram shows: basic position, 0 turns)
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
3/7
5 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt)
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
0 0.5 1 1.5 2 2.5 3
50
40
30
20
0
10
Grösse / size 08
45
35
25
15
5
(0)
(1.3)
(2.6)
(4)
(5.3)
(6.6)
(8)
(9)
(11)
(12)
(13)
P0032.ai
Q [l/min (gpm)]
X
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
0 1 2 3 4 5 6
Grösse / size 12
90
70
50
30
0
10
80
60
40
20
(0)
(2.6)
(5.3)
(8)
(11)
(13)
(16)
(19)
(21)
(24)
(26)
100
P0031.ai
Q [l/min (gpm)]
X
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
0 1 2 3 4 5 6
Grösse / size 16
180
140
100
60
0
20
160
120
80
40
(0)
(5.3)
(11)
(16)
(21)
(26)
(32)
(37)
(42)
(48)
(53)200
P0030.ai
Q [l/min (gpm)]
X
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
0 1 2 3 4 5 6 7
Grösse / size 20
250
200
150
100
0
50
225
175
125
75
25
(0)
(6.6)
(13)
(19.8)
(26)
(33)
(40)
(46.2)
(53)
(59.4)
(66)
P0029.ai
Q [l/min (gpm)]
X
Q = f (X; no of turns)
Closing flow rate adjustment characteristic
0 1 2 3 4 5 6
Grösse / size 25
360
280
200
120
0
40
320
240
160
80
(0)
(11)
(21)
(32)
(42)
(53)
(64)
(74)
(85)
(95)
(105)400
P0028.ai
Q [l/min (gpm)]
X
0 2 4 6 8 10 12
Grösse / size 32Q [l/min (gpm)]
X
540
420
300
180
0
60
480
360
240
120
(0)
(16)
(32)
(48)
(64)
(79)
(95)
(111)
(127)
(142)
(158)600
P0027.ai
X = no. of turns of adjusting ring back from the basic position.
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
4/7
6 Dimensions & sectional view
6.1 Series RS…-P-…
model / version A:
NS 08, 12, 16 with sealing edge
model / version B:
NS 20, 25, 32 with O-Ring (NBR)
Size
RS…-P-
Max.
actuating
flow rate
l/min
[gpm]
Pmax
bar
[psi]
ØA
mm
[inch]
B
mm
[inch]
C
mm
[inch]
(D)
mm
[inch]
G Gl
mm
[inch]
M Ml
mm
[inch]
SW
mm
[inch]
W
Nm
[lbf-ft]
Weight
kg
[lbs]
08 5…40
[1.3…11]
350
[5000]
Ø31.2
[1.22]
51
[2.00]
24
[.944]
(27)
[(1.06)]
G⅜“ 12
[.472]
M22x1.5 9
[.354]
27
[1.06]
110
[80]
0.15
[0.33]
12 20…80
[5.3…21]
350
[5000]
Ø37
[1.45]
70
[2.75]
35
[1.37]
(35)
[(1.37)]
G½“ 15
[.590]
M28x1.5 15
[.590]
32
[1.25]
160
[120]
0.27
[0.59]
16 40…160
[11…42]
350
[5000]
Ø47.4
[1.86]
87
[3.42]
47
[1.85]
(40)
[(1.57)]
G¾“ 17
[.669]
M35x1.5 20
[.787]
41
[1.61]
240
[180]
0.53
[1.16]
20 50…200
[13…53]
350
[5000]
Ø53
[2.08]
101
[3.97]
56
[2.20]
(45)
[(1.77)]
G1“ 18.5
[.728]
M40x1.5 23
[.905]
46
[1.81]
420
[310]
0.78
[1.71]
25 80…360
[21…95]
350
[5000]
Ø63.5
[2.50]
123
[4.84]
78
[3.07]
(45)
[(1.77)]
G1¼“ 21
[.826]
M50x1.5 35
[1.37]
55
[2.16]
750
[555]
1.32
[2.91]
32 120…580
[32…153]
300
[4300]
Ø80.5
[3.17]
148
[5.82]
87.5
[3.44]
(60.5)
[(2.38)]
G1½“ 23
[.905]
M64x2 37
[1.45]
70
[2.75]
1000
[740]
2.72
[5.99]
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
5/7
6.2 Series RS…-W-…
Size
RS…-W-
Max.
actuating
flow rate
l/min
[gpm]
Pmax
bar
[psi]
A
mm
[inch]
B
mm
[inch]
C
mm
[inch]
D
mm
[inch]
E
mm
[inch]
F
mm
[inch]
G Gl
mm
[inch]
H
mm
[inch]
ØI
mm
[inch]
X
Nm
[lbf-ft]
Y
Nm
[lbf-ft]
Weight
kg
[lbs]
08 5…40
[1.3…11]
350
[5000]
55
[2.16]
40
[1.57]
45
[1.77]
26.5
[1.04]
35
[1.37]
22.5
[.885]
G⅜“ 13.5
[.531]
2.5
[.098]
Ø22
[0.86]
130
[100]
60
[45]
0.74
[1.63]
12 20…80
[5.3…21]
350
[5000]
75
[2.95]
50
[1.96]
55.5
[2.18]
34.5
[1.35]
50
[1.96]
29
[1.41]
G½“ 14.5
[.570]
4
[.157]
Ø27
[1.06]
220
[165]
100
[75]
1.49
[3.28]
16 40…160
[11…42]
350
[5000]
95
[3.74]
60
[2.36]
67.5
[2.65]
39.5
[1.55]
65
[2.55]
33
[1.30]
G¾“ 17.5
[.688]
3
[.118]
Ø33
[1.30]
275
[205]
170
[125]
2.64
[5.82]
20 50…200
[13…53]
350
[5000]
105
[4.13]
60
[2.36]
67.5
[2.65]
44.5
[1.75]
75
[2.95]
33
[1.30]
G1“ 20.5
[.807]
3
[.118]
Ø40
[1.57]
275
[205]
250
[185]
3.00
[6.61]
25 80…360
[21…95]
350
[5000]
140
[5.51]
70
[2.75]
78.5
[3.09]
44.5
[1.75]
103
[4.05]
38
[1.50]
G1¼“ 22.5
[.885]
3
[.118]
Ø50
[1.96]
340
[250]
300
[225]
5.13
[11.3]
32 120…580
[32…153]
300
[4300]
155
[6.10]
90
[3.54]
98.5
[3.87]
60
[2.36]
114
[4.48]
48
[1.89]
G1½“ 24.5
[.964]
3
[.118]
Ø56
[2.20]
440
[325]
350
[260]
9.57
[21.10]
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
6/7
7 Installation and commissioning
ATTENTION!:
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be undertaken is to
check, and possibly replace, the external seals.
When changing seals, oil or grease the new seals
thoroughly before fitting them.
ATTENTION!:
The cartridge / valve must not be opened without
the manufacturer's express permission, other
wise the warranty will be voided!
ATTENTION!:
Secure the pipework in such a way that no radial
forces act on port Z.
IMPORTANT!:
The valve may only be used for its intended pur
pose within its nominal rating! If you plan to use it
outside the nominal rating, you must contact the
valve manufacturer.
IMPORTANT!:
Release all hydraulic pressure from the system
before any disassembly work.
IMPORTANT!:
Protect seals and flange faces from damage.
Pay attention to the port designations.
8 Ordering code
RS = Pipe Rupture Valve
08 = Size 08
12 = Size 12
16 = Size 16
20 = Size 20
25 = Size 25
32 = Size 32
Model / version
A = Screw-in cartridge with sealing edge (size 08, 12, 16)
B = Screw-in cartridge with O-ring (size 20, 25, 32)
P = Screw-in cartridge model
W = Body-mounted model
… = Setting for actuating flow rate
1)
(blank) = With sealing edge (RS…-P… in sizes 08, 12, 16)
N = NBR (nitrile) seals (all RS…-W-… and RS…-P-… in sizes 20, 25, 32)
(special seals on application)
e.g. -
_
--
08
-
RS
P
…
_
IMPORTANT!:
1)
must be min. 40% above max. operating flow
rate!
300-P-9050071-EN-03/12.2024
RS…-P-…, RS…-W-…
7/7
9 Cavity type for series RS…-P-…
Series A
mm
[inch]
B
mm
[inch]
C
mm
[inch]
D
mm
[inch]
M MI
mm
[inch]
RS 08-A-P-… min. Ø33
min. [1.29]
max. 2
max. [.078]
min. 34
min. [1.33]
min. Ø12
min. [.472]
M22x1.5 min. 10
min. [.393]
RS 12-A-P-… min. Ø39
min. [1.53]
max. 10
max. [.393]
min. 45
min. [1.77]
min. Ø16
min. [.629]
M28x1.5 min. 16
min. [.629]
RS 16-A-P-… min. Ø49
min. [1.93]
max. 15
max. [.590]
min. 57
min. [2.24]
min. Ø20
min. [.787]
M35x1.5 min. 21
min. [.826]
RS 20-B-P-… min. Ø55
min. [2.16]
max. 25
max. [.984]
min. 66
min. [2.60]
min. Ø25
min. [.984]
M40x1.5 min. 24
min. [.944]
RS 25-B-P-… min. Ø65
min. [2.55]
max. 23
max. [.905]
min. 88
min. [3.46]
min. Ø30
min. [1.18]
M50x1.5 min. 36
min. [1.41]
RS 32-B-P-… min. Ø82
min. [3.22]
max. 35.5
max. [1.40]
min. 97.5
min. [3.83]
min. Ø38
min. [1.50]
M64x2 min. 38
min. [1.50]
E 2024 by Bucher Hydraulics AG, CH-6345 Neuheim
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.325.355