Gas Appliance Pressure Regulators
Rubber Seat Poppet Models
© 2008, Maxitrol Company, All Rights Reserved
1
RV/CV Series—
RV12, RV20, RV47, RV48,
and CV47
These rubber seat poppet type regulators are designed
primarily for main burner and pilot load applications
where precise control of tiny flows is an essential
operating requirement. ® certified (.15 CFH).
Housings are of high strength aluminum die castings.
All models, with the exception of “D” suffix models, have been
tested for multi-poise mounting and may be installed in any
plane or angle without restriction. “D” suffix models are to be
mounted horizontally. Other than normal upright position will
result in slight difference of outlet pressure. They may be
used with natural, manufactured, mixed, LP, or LP gas-air
mixture.
Models having the letters A, C, D, E, F, L, M, MK, N, R,
SR, S, T, or a combination of any of these suffix letters,
indicates the design modifications described below:
A — short stack – limited spring adjustment (RV47 &
CV47).
C — convertible regulators – preset to deliver outlet
pressures for either NAT or LP gases (RV20,
RV47, RV48, and CV47)
D — integral ball check limiting device that
permits normal opening and restricts closing cycle
(RV47 and CV47)
E — excessive pressure rated
F — factory-set, fixed/non-adujustable regulator
F6— 3/8” tube inverted flare
I — left side integral manual valve – outlet faces main
inlet (CV47)
L — an integral vent limiting orifice as the breather
hole
MAXIMUM INLET PRESSURE:
RV12, RV20, RV47, RV48 & CV47 .......... 1/2 psi (34 mbar)
EMERGENCY EXPOSURE LIMITS:
RV12, RV20, RV47, RV48 & CV47 ......... 2.5 psi (172 mbar)
GASES (RV Models): Suitable for application in natural,
manufactured, mixed gases, liquified petroleumgases and LP
gas-air mixture piping systems.
GASES (CV47 Model): Natural or Liquified Petroleum
MOUNTING: Other than normal upright position will result in
slight difference of outlet pressure — mount with flow
direction as marked on bottom casting.
NOTE: All Maxitrol gas appliances pressure regulators
should be installed and operated in accordance with
Maxitrol’s “Safety Warning” Bulletin. Different models have
CSA, German D.V.G.W., European EN-88, and Australian Gas
Association certifications.
M — B.S.P. - PL parallel thread – conforms to ISO 7 1, where pressure tight joints are made on the
threads.
MK— B.S.P. - TR taper thread – conforms to ISO 7-1,
where pressure tight joints are made on the
threads.
N — main burner only – includes internal by-pass
orifice to prevent lockup (RV20, RV47, RV48 &
CV47).
R — right side integral manual valve – outlet faces
main outlet (CV47).
SR— side tap – right side 1/8” N.P.T. (RV20 & RV47).
S — side tap – left side 1/8” N.P.T. (RV20, RV47 &
CV47).
T — model variation for operating at higher ambient
temperatures.
The CV47 can best be described as an RV47 with an extra
regulated outlet. This outlet contains an integral manual
valve, and is located on the valve body’s side.
The short stack models have an adjustment range of less
than 2” w.c. (5 mbar). These models are advantageous
where installation must be made in limited space.
Convertible regulators are designed to deliver either of two
fixed outlet pressures, for natural or LP gases. RV20C 4” to
10” w.c. RV47C & CV47C 4”, 5” or 6” to 10” or 11” w.c.
RV48C 5” to 10” w.c.
AMBIENT TEMPERATURE LIMITS:
RV20, RV47, CV47, RV48.........32º to 225ºF (0º to 107ºC)
RV12.................................... –40o to 225oF (–40o to 107oC)
RV12T.................................. -40º to 275ºF (-40º to 135ºC)
RV20T.................................. -40º to 300ºF (-40º to 148ºC)
RV48T .................................. ..32o to 275oF (0o to 135oC)
© 2008, Maxitrol Company, All Rights Reserved
The RV48 model may be used with either a 12A04 ball check
device, or a 12A06 fixed orifice vent limiting device. Vent
limiters are designed for use indoors and in spaces where
limiting the amount of gas escapement due to diaphragm
failure is critical. Vent limiters are not to be used out-
doors if they are exposed to the environment. 13A15
vent protector is available for outdoor use when vent
protection is required.
Maxitrol rubber seat poppet models offer the ultimate in
design features and performance capabilities to meet specific
appliance or utility requirements.
2
Capacities and Pressure Drop
CAPACITIES — expressed in BTU/h (m3/h) — 0.64 sp gr gas
Pressure Drop
@ 0.3” w.c.
Model Pipe Size
RV12
RV20
RV20C
CV47
RV47
CV47A & C
RV47A & C
RV48
RV48C
NOTE: Minimum main burner regulation capacity for all models (except “N”) is 150 btu/h (.0042 m
* Available as loxit connection.
1/8” x 1/8”*
3/16”Lox x 3/16”Lox
1/4” x 1/4”
3/8” x 3/8”*
1/4” x 1/4”
3/8” x 3/8”
3/8” x 3/8”
1/2 x 1/2”*
3/8” x 3/8”
1/2” x 1/2”
1/2” x 1/2”
3/4” x 3/4”
1/2” x 1/2”
3/4” x 3/4”
or (.7mb)
14,800 (.42)
8,800 (.25)
30,000 (.85)
30,000 (.85)
55,000 (1.5)
60,000 (1.7)
55,000 (1.5)
60,000 (1.7)
130,000 (3.7)
150,000 (4.2)
130,000 (3.7)
150,000 (4.2)
Range of Regulations
Main Burner
30,000 (.85)
65,000 (1.84)
75,000 (2.11)
125,000 (3.5)
125,000 (3.5)
230,000 (6.5)
250,000 (7.1)
400,000 (11.3)
M.B. and Pilot
25,000 (.71)
15,000 (.43)
50,000 (1.4)
50,000 (1.4)
90,000 (2.5)
125,000 (3.5)
230,000 (6.5)
250,000 (7.1)
275,000 Nat (7.8)
275,000 LP (3.1)
Individual Load
Fixed Orifice
20,000 (.56)
20,000 (.56)
30,000 (.85)
15,000 (.42)
40,000 (1.1)
40,000 (1.1)
40,000 (1.1)
40,000 (1.1)
3
/h).
Ball Check
Devices
—
—
—
125,000 (3.5)
125,000 (3.5)
160,000 (4.5)
160,000 (4.5)
HOW TO CALCULATE PRESSURE DROP AT VARIOUS FLOW RATES FROM CAPACITY CHART:
FORMULA: P2 = P1 x (Q2/Q1)
P2 = Pressure drop at desired flow rate.
P1 = Known pressure drop (in this case 0.3” w.c.)
Q2 = Desired flow rate.
Q1 = Known flow rate at 0.3” w.c. (see chart)
2
SELECTING A REGULATOR WITH SUFFICIENT CAPACITY:
A. Check Capacity Chart insuring regulator has ample
range of regulation and individual load capacities
(for use with pilot) for the application.
B. Know minimum encountered inlet pressure.
MINIMUM INLET PRESSURE MINUS “P2” MUST
BE GREATER THAN DESIRED OUTLET
PRESSURE.
Solve for “P2” using above formula.
EXAMPLE: 1/2”NPT regulator required for main burner
and pilot.
Desired maximum flow rate = 150,000 btu/h.
Maximum individual load = 150,000 btu/h.
Using the Capacity Chart shows the RV48 is the only
regulator satisfying the requirements in “A”.
P2 = 0.3” w.c. x (150,000/130,000)2 = 0.4” w.c.
7.0” w.c. — 0.4” w.c. = 6.6” w.c.
6.6” w.c. is greater than the required Po of 5.0” w.c.
THE RV48 (non “L” fixed orifice), VENTED OR W/12A04
BALL CHECK DEVICE, IS THE CORRECT REGULATOR
FOR THIS APPLICATION.
Minimum inlet pressure = 7.0” w.c.
Required outlet pressure = 5.0” w.c.
© 2008, Maxitrol Company, All Rights Reserved
3
Dimensions and Spring Ranges
RV12
<
A
<
<
D
<
<
B
<
<
<
C
RV20
<
A
<
B
<
<
DIMENSIONS**: inches (millimeters)
0.4
(10)
0.5
(13)
0.6
(16)
0.6
(16)
0.75
(19)
Call-Outs
1.7
(43)
2.4
(61)
2.9
(75)
2.9
(75)
3.4
(86)
Model Vent Tap
RV12
RV20
RV47
CV47
RV47A
CV47A
RV48
None
(Integral)
5/16-24
(Integral)
None +
(Integral)
None +
(Integral)
1/8” NPT ^
Swing
Radius
1.4
(35)
1.6
*
(41)
1.9
(48)
1.6
(41)
2
(51)
ABCD
1.7
(43)
2.1
(54)
2.5
(64)
2.25
(57)
2.75
(70)
* For 1/8” tube connector
+ Order with “D” or “L” suffix
^ Can be supplied with 12A04 or 12A06 vent limiting
device
**Dimensions are maximums and are to be used only as an aid in designing
clearance for the valve. Actual production dimensions may vary somewhat from
those shown.
RV47, 47A
<
D
<
<
C
<
<
A
<
B
<
<
<
<
D
<
<
C
CV47, 47A
<
D
<
<
C
<
1.4
(35)
1.75
(45)
2.25
(57)
2.25
(57)
<
A
<
B
<
<
RV48
3
(76)
<
A
<
B
<
<
<
<
D
<
<
C
Spring Selection Chart — inches w.c. (mbar)
RV12
RV20
CV47
RV47
RV48
Standard
Spring
2.8” to 5.2”
(6.9 to 13)
2.8” to 5.2”
(6.9 to 13)
2.8” to 5.2”
(6.9 to 13)
3.0” to 6.0”
(7.5 to 15)
1.0-3.5
(2.5-8.8)
1.0-3.5
(2.5-8.8)
1.0-3.5
(2.5-8.8)
1.0-3.5*
(2.5-8.8)
*
*
*
—
—
3.8-4.3
(9.5-10.8)
—
Model
* Uncertified Spring
Maxitrol Company
23555 Telegraph Road, PO Box 2230
Southfield, MI 48037-2230 U.S.A.
RVPO_MS_EN_03.2008
Replaced MS2032
4.0-8.0
(10-20)
4.0-8.0
(10-20)
4.0-8.0
(10-20)
4.0-8.0
(10-20)
__
___
4-12
(10-30)
Other Springs Available
—
—
4.7-5.3
(11.8-13.3)
—
—
—
—
5.0-12
(12.5-30)
4
—
—
5.6-6.4
(14-16)
—
6.0-10
(15-25)
6.0-10
(15-25)
6.0-10
(15-25)
6.0-10
(15-25)
8.0-12
(20-30)
8.0-12
(20-30)
8.0-12
(20-30)
8.0-12*
(20-30)
—
9-12
*
(22.5-30)
9.7-11.3
(24.2-28.3)
—
www.maxitrol.com
© 2008, Maxitrol Company,
All Rights Reserved
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