RL50
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
P
1/2” BSPP female
inlet and exhaust
N
1/2” NPT female
inlet and exhaust
56AE
3/8” OD medium
pressure tube inlet
81AE
9/16” OD medium
pressure tube inlet
Leave blank for
P and N inlet options
50P
1/2” BSPP
female exhaust
50N
1/2” NPT female
exhaust
Leave blank if none require
d
E
Handwheel
(external)
adjustment
Exposure to high
and low fluid
temperatures will
influence handle
temperature.
Operator safety
must be considered
Further adjustment
options are available
on request
Leave blank if none require
d
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 +200˚C
HNBR
Hydrogenated
Nitrile seals
-20˚C to +150˚C
Further seal options are
available on request
1.6K
13.8 - 110 bar
(200 - 1,600 psi)
5K
69 - 345 bar
(1,000 - 5,000 psi)
15K
276 - 1,034 bar
(4,000 - 15,000 psi)
Advise us of set
pressure if factory
pre-setting is required
V A L V E S
The Specier’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
VALVE
TYPE
SEAL
OPTIONS
SET
PRESSURE
RANGE
INLET
PORT
OPTIONS
EXHAUST
PORT
OPTIONS
VALVE
OPTIONS
WORKING
FLUID
OPTIONS
Externally Exposed Parts: 316 stainless steel on all pressure retaining
components, 300 series stainless steel is used for the external adjuster.
The non-wetted and enclosed internal adjuster is chrome steel
and brass.
Internally Wetted Parts: 316, 302 and 431 stainless steel. 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
INLET
EXHAUST
The RL50 is a 1/2” ported 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
Available preset via internal adjustment or with an
external handwheel adjustment option
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
Subsea variants available, contact us for advice
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
RL50
RELIEF VALVE
UP TO 1,034 BAR 15,000 PSI
1/2”
37.8mm A/F
[1.49in]
30.5mm [1.20in]
43.2mm [1.70in] WITH AE PORTS
EXHAUST
151.1mm [5.95in] WITH AE PORTS
138.4mm [5.45in]
87.6mm
3.45in
INLET
EXHAUST
4-OFF M6 FIXING HOLES
39.0mm [1.53''] SQ CENTRES
(
1.80'' RECOMMENDED PANEL
MOUNTING CLEARANCE HOLE)
50.8mm
[2.00in] SQ
LOCKING SCREW & WASHER
(CAN BE REMOVED WHEN
MOUNTING VALVE TO A PANEL)
129.3mm [5.09in] MAX / 117.9mm [4.64in] MIN
63.5mm
2.50in
E - HANDWHEEL OPTION
HANDWHEEL
LOCKING
RING
B
B
9.67mm
0.38in
6.8mm
0.27in
129.05mm
5.08in
0.2mm
0.01in
SECTION B-B
Specifications
RL50 - 56AE - 50P - E - WD - NBR - 1.6K
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
Ø6.0mm (Ø0.236”) - 1.6K & 5K
Ø4.1mm (Ø0.161”) - 15K
Liquids only
See materials section
See Product Selector opposite
and Technical Data section
1/2”
1.5 kg
(3.3 lb)
Specifications may change without notice
BASIC MODEL
NUMBER
SYMBOL
MAX WORKING
PRESSURE
MAX OUTLET PORT
PRESSURE
TEMPERATURE RANGE
PORT SIZE
WEIGHT
ORIFICE SIZE
FLUID
RL50
EXHAUST
INLET
!
10/20
Set Pressure - bar (kpsi)
Set Pressure vs. Coefcient of Discharge
800
(11600)
1000
(14500)
600
(8700)
400
(5800)
200
(2900)
0 0.05 0.10 0.15 0.20
0
Certied Coefcient of Discharge (Kdr)
5K
1.6K
15K
The ICdr value may be used to calculate discharge capacity in accordance with ISO
4126. We recommend contacting us with system details to confirm suitability.