WORKING
FLUID
OPTIONS
VALVE
TYPE
SEAL
OPTIONS
SET
PRESSURE
RANGE
RL25C - WD - NBR - 1.6K
RL25C
Repair and seal kits are available
on request
For a seal kit add SK at the end of the
model code and for a repair kit add RK
Leave blank if none required
WD
Water duty
SWD
Sea water duty
Leave blank for Viton® seals
-10˚c to +120˚c
NBR
Nitrile seals
-30˚C to +105˚C
KLZ
Kalrez® seals
-25˚C to +120˚C
HNBR
Hydrogenated
Nitrile seals
-20˚C to +120˚C
Further seal options are available
on request
1.6K
28 - 110 bar
(400 - 1,600 psi)
4K
69 - 276 bar
(1,000 - 4,000 psi)
9K
207 - 621 bar
(3,000 - 9,000 psi)
15K
552 - 1,034 bar
(8,000 - 15,000 psi)
Advise us of set pressure if factory
pre-setting is required
V A L V E S
The Specier’s Catalogue Page ???
Typical Performance
Materials Product Selector
Installation Diagram
CATALOGUE ALSO AVAILABLE ON CD
VISIT OUR WEBSITE FOR A FULL ONLINE SEARCH FACILITY
www.bisvalves.co.uk
4 PORT
DIRECTIONAL
CONTROL
CHECK
AND
SHUTTLE
PILOT
OPERATED
CHECK
RELIEFEXCESS
FLOW
FILTERSPRESSURE
SENSING
ACTUATORS PUMPSTECHNICAL
DATA
3 PORT
DIRECTIONAL
CONTROL
SOLENOIDFLOW
CONTROL
Externally Exposed Parts: 316 stainless steel.
Internally Wetted Parts: 316 and 302 stainless steel and acetal.
The seat and ball are 440C stainless steel and silicon nitride
respectively. The water duty version contains a 17-4 PH stainless
steel seat. The sea water duty valve uses only 316 stainless steel,
inconel and silicon nitride in wetted areas. Note that use with
water above 100°C is not recommended.
The standard valve has Viton® seals. Further seal options are
available via the Product Selector. Compatibility with the
working uid at the operating temperature must be considered.
A
A
SECTION A-A
INLET
EXHAUST
The RL25C is a cartridge style
relief valve. Designed for
emergency relief applications,
it may be used to protect
systems up to 1,034 bar
(15,000 psi).
The valve is a proportional
metering style relief valve,
and is approved as a safety
accessory to category IV of the
Pressure Equipment Directive,
enabling its use in the most
demanding applications.
l
Approved to category IV of the Pressure Equipment
Directive (2014/68/EU)
l
Cartridge style valve, ideal for use in manifolds
l
Wire locking and tagging available on request
l
Minimal leakage at 90% of set pressure
l
Reseat within 20% of set pressure
l
Repeatabily within ±5% of set pressure
l
Suitable for subsea applications
l
Suitable for use with mineral oils and water glycols, with
options for water and sea water duty
l
Suitable for many other media, contact us for advice
l
Various spring ranges available.
Typical performance based on water
Contact us with system details for an application specific calculation
RL25C
RELIEF VALVE
UP TO 1,034 BAR 15,000 PSI
1/4”
C
C
30
22.4mm
0.88in
6.4mm
0.25in
23.0mm
0.91in
1.1/4" - 12 UNF THREAD
26.9mm
1.06in
28.85mm
1.136in
3.76mm
0.148in
38.1mm
1.50in
21.6mm
0.85in
23.52mm
0.025
[0.926in
0.001]
INLET
EXHAUST
85.1mm
3.35in
37.1mm
1.46in
42.9mm
1.69in
25.7mm
1.01in
A/F
INLET
EXHAUST
38.1mm A/F
[1.50in]
32.80mm ±0.10
1.291in ±0.004
8
NOTE - TOLERANCED
DIMENSIONS TO HAVE
SURFACE FINISH OF
CAVITY DETAIL
CONTACT US FOR FULL CAVITY
MANUFACTURING DETAILS
0.8
Specifications
10/20
Page ???
V A L V E S
!
1,034 bar
(15,000 psi)
69 bar
(1,000 psi)
Note: Any outlet port pressure is
directly additive to the set pressure
Ø3.2mm (Ø0.125”)
Liquids only
See materials section
See Product Selector opposite
and Technical Data section
1/4”
0.5 kg
(1.1 lb)
Specifications may change without notice
BASIC MODEL
NUMBER
SYMBOL
MAX WORKING
PRESSURE
MAX OUTLET PORT
PRESSURE
TEMPERATURE RANGE
NOMINAL SIZE
WEIGHT
ORIFICE SIZE
FLUID
RL25C
EXHAUST
INLET
Certied Coefcient of Discharge (kdr)
The kdr value may be used to calculate discharge capacity in accordance with
ISO 4126. We recommend contacting us with system details to conrm suitability.
Set Pressure - bar (kpsi)
Set Pressure vs. Coefcient of Discharge
0
0 0.15 0.25 0.35
1400
(20300)
1075
(15225)
700
(10150)
375
(5075)
9K
4K
1.6K
15K
