Pilot Operated Safety Relief Valves
2003/4
Pressure relief with Broady Flow Control Series F7000/8000 Series F70PR Flow Safe - Pilot Operated Safety Relief Valves
A Partnership Broady Flow Control are the exclusive agents for the UK and Irish markets, in addition to other key non-US markets, for the new CE marked Flow Safe range of Pilot Operated Valves. Broady assemble and test each valve in its own large manufacturing facilities at Kingston upon Hull in the UK, and these new products, compliment the already well specified existing range of Relief, Safety Relief, Reducing and Sustaining valves supplied for over 100 years, globally, by Broady Flow Control.
Broady Flow Control Broady Flow Control is an Independent Valve Manufacturer, specialising in Innovative and effective Solutions to satisfy it’s
The Companies
increasing customer demands, challenges and problems in flow control.
1 Relief. Safety relief. Pressure reducing and
sustaining valves.
2 Valves for Naval, Marine and other specialist
applications.
3 Pattern makers and master founders of
corrosion resistant copper based alloys.
4 Overhaul and refurbishment of valves
and other selected products and equipment.
FLOW SAFE
inc
INDUSTRY FOCUS
Flow Safe is a significant USA manufacturer of high quality Pilot Operated Pressure Relief and Safety Relief Valve Products with world-wide sales primarily in the following applications.
Natural Gas production, transmission, storage and distribution. Oil and petrochemicals. Mechanical equipment manufacturer’s, including: Reciprocating, Centrifugal, Compressors and Blowers. Industrial gas industries including Cryogenics. Pulp and paper, power and chemical industries. Marine and aerospace. Food and beverage industries.
1
Applications Natural gas Pilot operated safety relief
improving efficiency. The 100
valves (POSRV) provide
series pilot valve is bubble
overpressure safety protection
tight to the set point upon
for gas and liquid service
opening and to 95% of the
where large capacities, high
set point upon closure, this
accuracy and excellent
allows the user to operate
repeatable bubble tight
close to the nameplate set
shut-offs are required before
pressure, this is true for
or after a system upset.
both gas and liquid service and is distinct
The F7000/8000 and F70PR are both designed to be
advantage over
repeatedly cycled at full
conventional safety relief
pressure throughout their
valves. The 300 series
acceptable range of tempera-
modulating pilot valve is
tures. They are ideally suited
ideal for liquid applications
for systems that require close
and can also be used to
operating to set point pres-
control pressure spikes within
sures with both modulating
your system, which can
and snap acting pilots, there-
minimise regulator-to-pressure
by reducing product loss and
relief valve cycle conflict.
These valves are particularly advantageous and cost effective in installations where: ●
There may be size and weight limitations for the valve.
●
A high cycling rate exists.
●
A long service life is required.
●
Minimal product loss is important.
●
Reduced maintenance and installation time is desirable.
●
All applications, consideration should be given by the end user to
Typical gas line relief valve installation
POSRV Pressure regulator Gas meter
prevent freezing of liquids within the valve, which may under certain conditions cause erratic performance or valve failure.
Traditional Pilot Operated regulator/relief valve
Compare the value! Value of ownership is offered
High flow rates provide, in
by utilising the POSRV. Easy
many cases, one inlet size
installation and inline mainte-
smaller than equivalent
nance is offered by the right
flow capacity pilot operated
angle body style design.
regulator/relief valves.
POSRV Rain cap Discharge piping
The Flow Safe F70PR features: ●
Simple design
●
Reliable operation
●
Easy installation
●
Easy, inline serviceability
●
Superior flow capacities
●
Easy field testing
●
ESD - emergency shutdown
Top entry access Lift bracket
(capability available with use of dome unloader option)
Drain plug
FTC
2
Applications Traditional Blower relief valve installation
Positive displacement blowers-relief and unloading The modern design technology
main valve allows unloading by
of the F7000/8000 and F70PR
using the relief valve (two
offers for the first time, a
valves in one).
solution for this demanding,
POSRV
Upon start-up, to reduce
high cycle, high vibration/
downstream load the unloaded
pulsation service. Due to the
POSRV provides atmospheric
robust piston design, the
reference. When the blower
F7000/8000 and F70PR can
stage is run, the POSRV reverts
handle the inherent vibrations
back to relief mode.
and pulsations of this blower
less load is applied to motors
steel seating surface, the piston
offering protection, extending
guide rings, and the high L/D
motor life, and in some cases
piston construction allow the
reducing the required motor
valve the ability to operate
horsepower. Expensive butterfly
reliably and for an extended
valves and high maintenance
period of time.
actuators can be avoided when
valve to the dome of the POSRV
Blower Exhaust silencer
By unloading upon start-up,
service. The welded-in stainless
The addition of a solenoid
Inlet silencer
replaced with the combined Relief and Unloader Valve.
Process Industries The F7000/8000 and F70PR pressure relief Valve is a superior choice to protect industrial process applications because of the valves heavy duty, low profile body design. These valves have the ability to flow high volumes of gas or liquid and allows for a smaller valve size than traditional relief valves to get the the job done. Smaller valves are not only less expensive but also require smaller piping and isolation valving, and the associated connections, both on the inlet and on the outlet. With a variety of standard features on this range of valves and additional extras on both types including remote pressure pickup, field test connectors and unloading to name a few, allow operators greater versatility in the operation and servicing of this valve.
3
Series F7000/8000
Series F7000/8000 - Pilot operated
Products and features
Today’s industrial needs are being driven by requirements for high capacity, leak-tight safety relief valves to reduce fugitive emissions and to save the customer product. The Flow Safe F7000/8000 Series Pilot Operated Safety relief Valves, with accurate operational characteristics, are engineered to provide superior performance for today’s industries. F7000/8000 Design features include: ●
Large capacities through the overbored nozzle (F7000) and a variety of reduced orifice selections (F8000), API standard orifices.
●
Direct mount pilot valves, minimising potential leak paths.
●
Modulating or snap-acting, with interchangeable pilot valves.
●
Superior main valve seating force, proportional to nameplate set pressure.
●
Repeatable, bubble-tight seating and re-seating, due to soft seat design.
●
Compact profiles, for easier handling and installation.
●
Adjustable blowdown capability.
●
Superior flow capacities, independently verified.
●
Full lift at set pressure upon demand.
●
Easy convertability of orifice sizes, field adjustable.
●
Integral exhaust with F300 pilot valve.
●
Set pressures from 15 to 6000 psig.
●
-423°F to +525°F temperature range.
●
A variety of materials and end connections, 316SS trim standard on carbon steel main valves.
●
Material traceability availability.
●
Top entry main valve for easy maintenance.
●
Lifting lugs standard on sizes 2x3 and larger.
●
One piece main valve casting with integral flanges.
●
Backflow preventor and field test connection - standard features.
●
Adjustments are heavy duty stainless steel safety-wired and sealed.
●
All valves bear ASME “UV” stamp, at 15 psig and above.
●
Compliance with industry standards, including ASME, NACE and ANSI.
●
CE marked. 4
eries 00/8000
Operation System pressure is routed
closed, dome pressure acting
Modulated pilot valve
from below the valve through
on a different area between
provides zero blowdown, i.e.
the pilot valve to the dome
the top and bottom of the
the main valve opens in
cavity of the main valve. This
piston assembly, creates a
proportion to demand and
pressure acting, on a piston
downward force on the seat
closes at the set pressure.
(dome) area Ad larger than
providing bubble tight shut-off.
the seat area (As), creates
The F7000/8000 utilises an
The orifice size may be easily selected by choosing an
an effective downward force
elastomeric or plastic seat on
overbored fixed inlet nozzle
(F=Px(Ad-As)) holding the
the piston to achieve bubble-
on the F7000, or by
main valve piston down in
tight seating. A dynamic
converting to the api reduced
the closed position.
piston seal prevents any
size orifices (F8000), by
leakage from the dome to
attaching FLOW SAFE’s patent
pressure, the pilot valve
the discharge. Guide rings on
pending annular flow-plug to
reduces the dome pressure,
the piston eliminate metal-to-
the bottom of the piston
proportional to demand if
metal contact with the liner
assembly. This plug reduces
modulating (F300), or fully
and help to provide smooth
the effective flow area of the
if snap-acting (F200), and
and consistent operation.
valve by directing the fluid
allows the piston to go into
Elastomeric/plastic seals seal
between the plug O.D. and
lift. Once the system pressure
the main valve and pilot valves.
the nozzle I.D. This feature
At the designated set
is relieved, the pilot valve
The F200 Snap-Acting pilot
in orifice selection allows
closes at the preset blow-
valve blowdown is set at 5-7%
the valve owner greater
down, allowing the dome to
of the set pressure and can
versatility in valve standardis-
repressurise and the main
be adjusted from 3% to 20%
ation, utilisation, and
valve piston to close. When
if so specified. The F300
minimising inventory.
Closed
Open
Outlet
Inlet
5
Series F7000/8000
Dimensions and weights available full bore orifice (F7000)
Series F7000/8000 Flanged * With F300 Pilot valve. Deduct 2” for F200 Pilot Valve
inlet flange
outlet flange
A
B
C* approx
approx weight (Ibs)
DEF
1” - 150#
2” - 150#
4.38
4.50
13.25
40
.957”
DEF
1” - 300#
2” - 150#
4.38
4.50
13.25
40
(.72in2)
DEF
1” - 600#
2” - 150#
4.38
4.50
13.25
45
DEF
1” - 900#
2” - 300#
4.94
4.75
13.80
50
.815”
DEF
1” - 1500#
2” - 300#
4.94
4.75
13.80
50
(.52in2)
DEF
1” - 2500#
2” - 300#
4.94
4.75
13.80
55
FGH
1-1/2” - 150#
3” - 150#
5.12
4.87
14.60
50
FGH
1-1/2” - 300#
3” - 150#
5.12
4.87
14.60
50
FGH
1-1/2” - 600#
3” - 150#
5.12
4.87
14.60
55
1.500” 2
(1.77in )
C
dimensions
available API orifice (F8000)**
1.337”
FGH
1-1/2” - 900#
3” - 300#
6.38
6.75
15.10
80
(1.40 in2)
FGH
1-1/2” - 1500#
3” - 300#
6.38
6.75
15.10
80
FGH
1-1/2” - 2500#
3” - 300#
6.38
6.75
15.10
90
GHJ
2” - 150#
3” - 150#
5.37
4.87
15.70
60
GHJ
2” - 300#
3” - 150#
5.37
4.87
15.70
60
GHJ
2” - 600#
3” - 150#
5.37
4.87
15.70
65
1.100” (.95 in2) A 1.939” 2
(2.95) in ) B 1.689”
GHJ
2” - 900#
3” - 300#
6.56
6.75
16.40
80
(2.24 in2)
GHJ
2” - 1500#
3” - 300#
6.56
6.75
16.40
80
GHJ
2” - 2500#
3” - 300#
7.00
6.75
16.40
95
JKL
3” - 150#
4” - 150#
6.13
6.38
18.25
100
JKL
3” - 300#
4” - 150#
6.38
6.38
18.40
100
JKL
3” - 600#
4” - 150#
6.38
6.38
18.40
100
1.503” (1.77in2) 2.900” (6.60 in2)
C
A
B
2.624”
JKL
3” - 900#
4” - 300#
7.50
7.12
17.80
130
(5.40 in2)
JKL
3” - 1500#
4” - 300#
7.50
7.12
17.80
145
LMNP
4” - 150#
6” - 150#
7.75
8.25
18.75
185
3.816”
LMNP
4” - 300#
6” - 150#
7.75
8.25
18.75
185
(11.43 in2)
LMNP
4” - 600#
6” - 150#
7.75
8.25
18.75
195
LMNP
4” - 900#
6” - 300#
9.74
9.19
20.80
240
LMNP
4” - 1500#
6” - 300#
9.74
9.19
20.80
265
QR
6” - 150#
8” - 150#
9.44
9.50
22.75
270
QR
6” - 300#
8” - 150#
9.44
9.50
22.75
270
QR
6” - 900#
8” - 150#
9.70
9.50
23.35
310
T
8” - 150#
10” - 150#
10.88
11.00
26.50
460
T
8” - 300#
10” - 150#
10.88
11.00
26.50
460
T
8” - 600#
10” - 150#
11.62
11.00
27.00
520
W
12” - 150#
16” - 150#
11.92
15.56
32.00
1100
DEF
1” FNPT
2” FNPT
5.06
3.00
14.00
35
FGH
1-1/2” FNPT
3” FNPT
4.63
3.75
14.13
45
3.624” (10.30 in2)
5.760” (26.06 in2)
7.625” (45.66 in2) 11.938” (111.87 in2)
Series F7000/8000 Treaded
.957” (.72 in2) 1.55” (1.77 in2)
6
eries 00/8000
Specifications - F7000 / 8000 INLET /OUTLET FLANGE RATINGS
maximum pressure rating, psig temperature, 째F flange class 150#
300#
600#
900#
1500#
2500#
-423 to -21
-20 to 100
200
300
400
525
C steel
-
285
260
230
200
170
S steel
275
275
240
215
195
170
C steel
-
740
675
655
635
600
S steel
720
720
620
560
515
480
C steel
-
1480
1350
1315
1270
1200
S steel
1440
1440
1240
1120
1030
955
C steel
-
2220
2025
1970
1900
1795
S steel
2160
2160
1860
1680
1540
1435
C steel
-
3705
3375
3280
3170
2995
S steel
3600
3600
3095
2795
2570
2390
C steel
-
6170
5625
5470
5280
4990
S steel
6000
6000
5160
4660
4280
3980
material
Piston seal/wear ring configuration
Carbon steel: ASTM SA216, Grade WCB
F7050
Stainless steel: ASTM SA351, Grade CF8M
piston seal wear ring
Ratings at temperatures equal to or above -20째F per ANSI B16.34
SEAT AND SEAL DATA F7040 continuous process temperature, 째F
piston seal wear ring
Seal configuration F7050 (with elastomer seat)
material
min
max
Buna-N
- 85
+275
15
6000
Vton
- 50
+400
15
6000
- 65
+325
15
6000
Urethane
- 65
+325
15
6000
Teflon
- 423
+400
15
1000
Kel - F
- 424
+400
1000
4000
Vespel
- 423
+550
4000
6000
Peek
- 100
+525
4000
6000
Ethylene Propylene seat
maximum pressure (psig)
minimum pressure (psig)
F7040 (with plastic seat) retainer bolt with locking insert seat
7
Series F7000/8000
Part numbering - F7000/ 8000 The following part numbering system is to be used when ordering a FLOW SAFE F7000 or F8000, with F200 or F300 pilot valves. Valve type
Type pilot valve
Softgoods
Flow area
ANSI pressure class
7
2
5
0
05
03
04
S1
F
F
Access
Material
Inlet facing
Outlet
Inlet
7
Full bore
8
Reduced bore, controlled flow
2
F200 (gas only)
3
F300 (gas or liquid)
4
Plastic
5
Elastometer
0
Full bore
D-W
API orifice
00
FNPT
05
150 lb
10
300 lb
12
600 lb
14
900 lb
16
1500 lb
18
2500 lb
S
Special
F
Filter
R
Remote sense
M
Manual blowdown
C
Cryo vapouriser
S1
Standard (stainless trim)
SS
All stainless
N1
NACE standard (stainless trim)
NS
NACE (all stainless)
SP
Special
F
Raised face
R
RTJ
T
Screwed
S
Special
02 - 16
Outlet, inches
01 - 12
Inlet, inches
EXAMPLES Description 1 4” x 6” Modulating-type pilot valve; set pressure = 600 psig, natural gas service, carbon steel, NACE, 300# RF Inlet, 150# RF outlet, ‘M’ orifice, Buna-N Seals, filter.
2 3” x 4”, Snapacting-type pilot valve; set pressure = 75 psig, Cryogenic N2 service, stainless steel, 150# RF Inlet, 150# RF outlet, full bore, Teflon main valve seat.
3 1-1/2” x 3, Modulating-type pilot valve; set pressure = 50 psig, 60°F, fresh water service, stainless, 1-1/2” FNPT Inlet, 2” FNPT outlet, ‘G’ orifice, Teflon seat.
Designation
Designation
Designation
835M100406FN1F@600 psig
7240050304FSS@75 psig
834G001503TSS@50 psig
with Buna-N seat and elastometers.
with Teflon seat.
with Teflon seat. 8
eries 70 PR
Series F70 PR - Pilot operated
Products and features
Today’s Natural Gas and Process Industries require leak tight valves to reduce emmisions, save product, and minimise horsepower requirements. The F70PR Series “High Performance” Pilot Operated pressure relief valves accomplish bubble-tight sealing with accurate and consistent operational characteristics. F70PR Design features include: ●
Modulating valve action - “less product loss”.
●
Elastomeric seat and seals.
●
Repeatable bubble-tight seating.
●
Rugged, simple and efficient design.
●
Superior flow capacities.
●
10”WC to 285 psig pressure range.
●
-65 to +400°F service temperature.
●
Easy and economical installation.
●
Inline maintenance capability.
●
Pilot exhaust to main valve - standard.
●
Capacities independently verified.
●
Discharge drain plug standard.
●
Lift brackets - 2x3 and larger - standard.
●
Low upset ratio (piston area/seat area).
The policy of Flow Safe and its authorised assemblers is a commitment to value through: Environmentally compatible products. Cost efficient design, with minimal parts. Quality products, readily available. Flexibility, to meet unique customer needs. “No hassle” service. 9
Series F70 PR
Operation System pressure is routed
CLOSED
from the inlet below the
F100 pilot valve
valve, through a modulating pilot valve to the dome cavity of the valve. At the designated set pressure, the pilot valve reduces the dome pressure, proportional to
Dome cavity
demand at the set pressure, Outlet
and allows the piston to go into lift. Once system pressure is relieved, the pilot valve closes, allowing the dome to repressurise and the main valve piston to close. When closed, dome pressure
Inlet
acting on a differential area between the top and bottom
Drain plug
OPEN
of the piston assembly, creates a downward force
Lift bracket
on the seat providing bubble-tight shut-off. The F70PR utilises an elas-
Inlet pressure
tomeric seat on the piston to achieve bubble tight seating. A dynamic piston seal
Liner Dome pressure
prevent any leakage from
Piston assembly
the dome to the discharge. Guide rings on the piston prevent any metal-to-metal
Outlet pressure
contact, and help to provide Body
smooth, consistent, and repeatable operation.
Unpressurised
Pressure pick-up tube
F100 low pressure assembly (10�WC - 5 psig)
F100 low pressure assembly (5 - 285 psig)
Main valve cap
Dome feed
Dome feed Pressure inlet Main valve cap
Pressure discharge (at set point)
Pressure discharge
Pressure inlet
10
eries 70PR
Specifications - F70PR SPECIFICATIONS
set pressure range, low pressure (LP)2
10”WC to 5 psig
set pressure range, high pressure (HP)2
5psig to 285 psig (ANSI 150)
process temperature range (continuous)
-65°F to 275°F (400°F w/Viton)
main valve body and liner material1
C
carbon steel (aluminium-1-1/2 x 2) or stainless steel
main valve trim material
aluminium
pilot valve body material
aluminium
A
B
pilot valve trim material
stainless steel
seat and seal material1
buna-n elastomer (viton or other upon request)
D
fitting material
stainless steel
SEAT DATA
continuous process temperature, °F
maximum pressure (psig)
seat material
min
max
minimum pressure (psig)
Buna-N
- 65
275
5
285
Viton*
-65
400
5
285
Ethylene Propylene (EPR)
-65
325
5
285
Kairez*
0
500
5
285
Neoprene (low pressure)
-20
200
10”WC
5
E
A
B F
Note: Viton, Kalrez are registered trademarks of the E.I.Dupont De Mours Company
DIMENSIONS AND WEIGHTS
maximum dimensions (inches)
connections weight (lbs)
inlet
outlet
A
B
C
D
E
F
1 - 1/2 x 2
15
1 - 1.2”FNPT
2”FNPT
2.75
3.00
13.50
13.50
14.50
13.50
2x3
60
2”150#F
3” - 150#RF
4.56
5.30
17.50
16.00
18.50
16.00
3x4
85
3”150#F
4” - 150#RF
5.70
7.00
20.50
17.50
21.50
17.50
4x6
170
4”150#F
6” - 150#RF
7.75
8.25
18.50
19.00
19.50
19.00
6x8
300
6”150#F
8” - 150#RF
9.44
9.50
22.50
22.00
23.50
22.00
8 x 10
500
8”150#F
10” - 150#RF
10.88
11.00
30.25
24.50
31.25
24.50
12 x 16
1200
12”150#F
16” - 150#RF
11.95
15.62
32.95
32.65
37.75
33.30
size
11
Series F70PR
Part numbering - F70PR To properly order and process a F70PR, please specify the following 1
Quantity required; required ship date(s), agreed to on quotation.
5
Material requirements: main valve, main valve trim, pilot valve, softgoods.
9
2
Inlet size and flange rating.
6
Operating conditions.
11 Any special packaging instructions.
3
Outlet size and flange rating.
7
Optional accessories.
12 Shipping instructions.
4
FLOW SAFE part number. See above.
8
Any special requirements.
12
10 00
-
-
Requirement documentation.
10 Valve tagging requirements.
1 2 B
Type valve
Options
02
F70 subassembly
B
bracket mount
03
F100 pilot valve subassembly
D
closed dome tee
12
F70PR assembly
F
inlet filter
R
remote pickup
M
manual blowdown
Type assembly
P
backflow preventer
10
F70PR assembly
T
field test connection
11
F70 subassembly
S
solenoid valve
91
F100 pilot valve subassembly (PV)
V
diverter valve
SP
special
2
carbon steel
3
stainless steel (PV only)
5
aluminium (1/2 x 2 or PV only)
0
low pressure
1
high pressure
Unique part number
03
1-1/2 x 2
00
2x3
01
3x4
04
4x6
05
6x8
06
8 x 10
08
12 x 16
94
Type material
Type pilot valve
F100 pilot valve subassembly
EXAMPLES 3 - Conditions
1 - Conditions
2 - Conditions
Operating pressure =
Operating pressure =
Operating pressure =
42 psig
8” WC
160 psig
Set pressure =
Set pressure =
Set pressure =
50 psig
10” WC
180 psig
Media
Media
Media
Natural gas
Natural gas
Natural gas
Capacity required =
Capacity required =
Capacity required =
500000 SCFH
450000 SCFH
800000 SCFH
Accessories
Accessories
Accessories
Filter
Field test connection and filter
Field test connection
ORDER
ORDER
ORDER
P/N 12 - 1001 - 12BF, F70PR
P/N 12 - 1004 - 02BFT, F70PR
P/N 12 - 1006 - 12T, F70PR HP,
HP, 3 x 4, Set pressure = 50 psig
LP, 4 x 6, Set pressure = 10”WC
8 x 10, Set pressure = 180 psig
12
Accessories and options to pilot valve
Field Test Connector (T) (Standard feature on F7000/8000) This allows the user to verify the set pressure while in service without valve removal. An external pressure source may be attached to the FTC to direct pressure to the pilot valve, while blocking off the inlet pressure, thus
1/2�FNPT
checking the set pressure and the general operation of the valve.
field test connection
backflow preventer check valve
Backflow Preventer (P) (Standard feature on F7000/8000) To prevent backflow into the system, when outlet pressure exceeds the inlet pressure, a backflow preventer can be provided. The outlet pressure is routed to the main valve dome, to ensure that the piston remains closed.
main valve outlet
Remote Pressure Pick-up (R) (Standard feature on F7000/8000)
outlet
Remote pressure pickup is recommended when inlet piping pressure
F70PR
losses exceed 3% to the relief valve. This allows a remote, more direct pressure sensing to the pilot valve, plus an excellent source of clean air.
inlet
manual valve
Manual/Remote Blowdown (M) Allows for main valve lift by bypassing the pilot valve. Accomplished by a manual blowdown valve.
solenoid valve or control valve
Remote -Unload Blowdown (SC or SO) Allows for main valve lift by bypassing the pilot valve. Ideal as an unloading valve to eliminate/vent system pressure for positive displacement blowers, or to act as an emergency shutdown device (ESD) for the natural gas compressor industry. Accomplished by use of an automatic blowdown valve, pneumatic, provided
hydraulic,
or
electric
valve.
Automatic
valves
can
be
in AC or DC, Normal Closed or Normally Open (preferred as
fail safe).
Inlet Supply Filter (F)
to pilot valve
This should be used for dirty applications to clean the supply gas to the pilot valve. This is supplied with a purge vent. filter
Closed Dome Tee (D) This allows the user to verify the set pressure while in service without valve removal. A tee is provided on the main valve cap to attach a gage or any other instrumentation.
Diverter Assembly (V) (F70PR Only) Two F100 Pilot valves can be supplied mounted to the F70 main valve assembly, with a switching for maintenance and servicing.
Dual Pilot Valve (Y) Two F100 pilot valves can be supplied mounted to the F70 main valve assembly, with a switchover valve in between. The pilot valves can be set at two separate set pressures, allowing the operator the flexibility to change the set point or perform maintenance on one of the pilot valves.
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Other products available from Broady Flow Control
Liquid relief valve - F84L
Reducing valves - A, AB, C6, C3, C7, C8, D, B2
Unloader Valves - F70U Low pressure reducing valves - CL3
Sustaining valves - Type A, Type D,Type 9
With whistle - F80M
Safety relief valves to API and ASME - Type 3500 Safety relief valves - F84, F85
Other safety and relief valves - 180 & 180S, 2600 14
Broady Flow Control Ltd English Street Kingston upon Hull East Yorkshire HU3 2DU telephone: +44 (0) 1482 619600 facsimilie: +44 (0) 1482 619700 email: sales@broady.co.uk website: www.broady.co.uk