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Cashco — MODEL BQ BACK PRESSURE / RELIEF REGULATOR

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                              FEATURES

Versatile:

Four body materials and twenty-one
trim material combinations allow compat
i bil i ty with many fluids.

High Capacity:

A large orifice and diaphragm provide
sensitivity with high ca pac i ty.

Tight Shut Off:

A composition seat is available in
sev er al materials.


                        APPLICATIONS

Designed for controlling a wide range of fluids in cluding
air, inert gases, cryogenic gas or liquids, chem i cals,
water, fuel oil and steam. See Table 1 for more in for ma tion.

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STANDARD/GENERAL SPECIFICATIONS

Body Sizes:

1/4", 3/8" or 1/2" (DN8, 10, or 15)
inlet and flow-thru connections. 1/2"
(DN15) outlet bottom connection. NPT
female only.
Body/Spring Chamber Material Combinations:

DI/DI, BRZ/DI, BRZ/BRZ, CS/SST,
SST/SST.
DI = Ductile iron
CS = Cast carbon steel
BRZ = Cast bronze
SST = Cast stainless steel
See Table 2 for material spec i fi ca tions.
Inlet Pressure:

Up to 400 psig (27.6 Barg). (In cludes
100 psi (6.9 Barg) pressure build when
set at 300 psig (20.7 Barg) under low
flow rate.) See Table 2.
Operating Temperature:

See Tables 2, 3, and 4.
Trim Design:

Metal seated or composition seated
brass or SST materials. See Figures
1 and 2, and Tables 3 and 4.

Capacities:

Up to 2 Cv; see Table 5 for Cv vs. set
pressure.
Water Flow - see Table 6.
Compressed Air Flow - see Table 7.

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Cont'd

Tables show capacities of 10, 20,
30, 40 and 50% build-up over the
set pressure. Set pressures were
de ter mined using a flow rate of 2% or
less of the 20% build-up capacities.
Ex am ple: 100 psig (6.89 Barg) set
pressure and a 20% build-up = 120
psig (8.27 Barg) flowing pressure for
the capacity listed.
Diaphragm:

Phosphor Bronze, Neoprene (BC),
Fluorocarbon Elastomer (FKM)
EPDM, SST TFE coat ed SST, Elgiloy.
Gasket:

Standard: Graphite/NBR. NOT SUITABLE
FOR OX Y GEN SER VICE.
Alternate Material: See Opt-45.

Range Springs:

Standard: Epoxy Coated Steel.
Cryogenic: SST.

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Flange Bolting:

Standard: Zinc plated; heat treated
steel.
Cryogenic: SST.
Painting:

Standard: All non-corrosion resistant
portions to be painted with corrosion
resistant epoxy paint per Cashco
Spec #S-1606.
Alternate: See Opt-95 or -95OS.

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OPTION SPECIFICATIONS


OPTION -1:

CLOSING CAP. A removable cast iron
cap dis cour ag es tam per ing with spring
set ting. Avail able only with DI or SST
spring cham ber materials. In cludes a
1/4" (DN8) NPT female vent con nection.
OPTION -1+6:

DIFFERENTIAL CONSTRUCTION.
For dif fer en tial or pressure loaded service;
in cludes fea tures of Opt-1 plus a
gasket for sealing the closing cap to the
spring chamber, a thread seal for the
lock nut, a pusher plate and a top-side
di a phragm gas ket (metal di a phragms
only).
The pressure loading, plus the spring
setting, plus build-up to stroke the
plug must not exceed pressures listed
Table 2.

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OPTION -5:

BRASS/BRONZE CRYOGENIC
CON STRUC TION. BRZ/BRZ Body/
spring cham ber ma te ri als only. Brass
ad just ing screw, lock nut, pressure
plate and spring button. SST range
spring and flange bolting. Only B0 and
B5 trim selections al lowed. Cleaned
and pack aged for oxygen service per
Cashco Spec. #S-1134. Spring chamber
has 1/4" NPT female connection
for purge gas plus a 1/8" drilled drain
hole. Mount in hor i zon tal piping with
the adjusting screw oriented downwards.
Ap pli ca ble tem per a ture range
-325°F to+150°F(-198°C to +66°C)

OPTION -25:

VENT TAP. Spring chamber vent
tapped 1/4" (DN8) NPT female for
remote venting.
OPTION -25S:

VENT SCREEN. Cap. (For Opt-25)
OPTION -36:

SST CRYOGENIC CON STRUC TION.
Same spec i fi ca tions as Opt-5 ex cept:
a. For SST/SST body/spring cham ber
materials.
b. S1 and S36 only available trim
se lec tions.
OPTION -45:

TFE GASKETS. Primarily for ox y gen
ser vice. Tem per a ture range: -20° to
+400°F (-29° to +205°C).

OPTION -55:

SPECIAL CLEANING. BRZ or SST
body ma te ri als only. Cleaned per
Cash co Spec. #S-1134 for ox y gen
ser vice. NOTE: De sign Pressure Rating
shall not exceed 375 psig (25.8
Barg) when body material is SST and
process medium is oxygen.
OPTION -56:

SPECIAL CLEANING. DI, CS, or SST
body ma te ri als only. Cleaned per
Cash co Spec. #S-1542. Not suit able
for ox y gen ser vice.
OPTION -95:

EPOXY PAINT. Special epoxy painting
of all non-corrosion resistant external
surfaces per Cashco Spec #S-1547.
Utilized in harsh atmospheric conditions.
OPTION -95OS:

EPOXY PAINT. Special epoxy painting
of all non-corrosion resistant external
surfaces per Cashco Spec #S-1687
for OFFSHORE installations.


TECHNICAL SPEC I FI CA TIONS
TABLE 1
APPLICATIONS

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