Control Products 921BPR User Manual
The Trerice Series 921 Pressure Regulator is
fully self-contained and requires no external
power source. This regulator requires that a usersupplied pressure sensing line be connected
from the controlled point to the diaphragm
actuator. Pressure in this line acts upon the
diaphragm to develop the necessary thrust to
stroke the valve, thereby maintaining the system
at the desired condition.
• For pressure reducing applications, the
pressure sensing line is mounted downstream,
and the valve closes as this sensed pressure
increases.
• For back pressure relief applications, the
sensing line is mounted upstream, and the
valve opens as the sensed pressure increases.
These valves can be used in any application
where the pressure reduction is not more than
90% of the inlet pressure.
For optimal performance,the service conditions
(medium,flow,temperature,inlet and outlet
pressures) of the application must be considered when
selecting a valve.Please refer to the Valve Selection
Section of this catalog.Improper application may
cause failure of the valve, resulting in possible
personal injury or property damage.
Self-Contained
Design
Spring Loaded/
Diaphragm
Actuated
Cast Ductile
Iron Housing
and Yoke
1
/2" through 6"
Val v e S i z e s
Model
921
Housing
Cast ductile iron, black finished
Pressure Plate
Cast-Iron
Diaphragm Material
Nylon reinforced Neoprene
Maximum Inlet Pressure
200 psi
Pressure Connection
1
/4NPT
Adjustment Nut
Steel
Adjustment Screw
Brass
Adjustment Spring
Cadmium plated steel
Body Material
1
/2" - 2": Bronze
2
1
/2"- 6": Cast-iron
Trim Mat erial
Stainless steel
Trim Style
Quick-opening
Connection
1
/
2
" - 2": Threaded, malleable iron
union ends
2
1
/2"- 6": Class 125 flanged
Pressure & Temperature
Rating
1
/
2
" - 2": 250 psi @ 410°F
(210°C)
2
1
/2" - 6": 125 psi @ 350°F
(175°C)
Sample Order Number: 921PRV-A55-075060
921PRV A55 075 060
Model — Valve — Inlet Pressure Outlet Pressure
921PRV (Pressure Reducing Valve) See Available Specify Upstream Specify Downstream
921BPR (Back Pressure Relief) Valves Pressure in psig Pressure in psig
(over) (i.e., 75 psig = 075) (i.e., 60 psig = 060)
Omit if 921BPR
How To Order
Specifications
921 pictured
12950 W.Eight Mile Road • Oak Park,MI 48237-3288 • 248/399-8000 • FAX:248/399-7246 • www.trerice.com
6/1/2001
33
Pressure Regulator 921 Series
Pressure Reducing or Back Pressure Relief Valve
Pressure Regulators & Acc.
12950 W.Eight Mile Road • Oak Park,MI 48237-3288 • 248/399-8000 • FAX:248/399-7246 • www.trerice.com
6/1/2001
34
Pressure Regulators & Acc.
Pressure Regulator 921 Series
Pressure Reducing or Back Pressure Relief Valve
Valve Selection
(BPR) (PRV) Maximum
Back Pressure Size Nominal Number of Inlet Dimensions Approximate
Pressure Relief Reducing Connection Port Seats Cv* (psig) A B C Shipping Wt.
A15 A14
1
/2NPT
1
/2" 1 2.8 200 4.8 [122] 1.8 [46] 1.8 [46] 3.0 lbs [1.35 kg]
A24 A21
3
/4NPT
3
/4" 2 8 200 5.6 [142] 2.3 [58] 2.3 [58] 5.0 lbs [2.25 kg]
A33 A29 1 NPT 1" 2 12 200 6.0 [152] 2.3 [58] 2.3 [58] 6.1 lbs [2.75 kg]
A44 A39 11/4NPT 11/4" 2 21 200 7.2 [183] 2.6 [66] 2.6 [66] 10.1 lbs [4.55 kg]
A55 A50 11/
2
NPT 1
1
/
2
" 2 30 200 7.7 [196] 2.6 [66] 2.6 [66] 11.1 lbs [5.00 kg]
A66 A61 2 NPT 2" 2 47 200 7.6 [218] 3.1 [79] 3.1 [79] 17.0 lbs [7.65 kg]
B74 B73 21/2"2
1
/2" 2 78 200 7.8 [198] 4.8 [122] 5.4 [137] 45 lbs [20 kg]
B79 B78 3" 3" 2 110 200 9.0 [229] 5.0 [127] 5.6 [142] 70 lbs [32 kg]
B84 B83 4" 4" 2 220 200 11.4 [290] 6.3 [160] 6.5 [165] 100 lbs [45 kg]
B89 B88 5" 5" 2 275 200 12.0 [305] 6.9 [175] 7.3 [185] 155 lbs [70 kg]
B94 B93 6" 6" 2 378 200 14.1 [358] 7.5 [191] 8.0 [203] 180 lbs [82 kg]
*
The valve selected should have a Cvapproximately two times that required by the service conditions. This will allow the valve to operate in
approximately the 50% open position.
C
B
A
C
B
A
C
B
A
C
B
A
Pressure
Reducing
Back Pressure
Relief
1
/
2" Valve
3
/
4"-2" Valve
1
/
2" Valve
3
/
4"-2" Valve
Actuator A
A 6.1 [155]
B 7.0 [178]
C 8.1 [206]
D 9.0 [229]
E 11.0[279]
Note:Actuator size and
internal spring are
determined by the inlet and
outlet pressure requirements
and will be specified by the
factory at the time of order.
All dimensions are nominal.
Dimensions in [ ] are in millimeters.
IDNC_reviii.eps
21/2"-6" Valve
C
B
A
21/
2"-6" Valve
C
B
A
13.28
[337.5]
A
1/4 NPT
FLOW
A
C
B
C
B
C
B
FLOW
A
C
B
FLOW
A
FLOW
A
C
FLOW
A
B
C
B
FLOW
Loading...