INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
IOM-HP-S-
DIFF
12-16
MODEL HP-1+6+S
HIGH PRESSURE DIFFERENTIAL
REDUCING REG U LA TOR
I. DESCRIPTION AND SCOPE
The Model HP-1+6+S is a heavy duty, high pressure
differential reducing regulator used to control
differential pressure between downstream outlet (P
2
)
pressure and a loading (P
LOAD
) pressure to the spring
chamber. This unit applies to Cashco drawing nos.
32911 (Non-NACE construction), 32909 (CS NACE
construction), or 32907 (SST NACE construction).
Sizes are 1/2", 3/4", and 1-1/2" (DN15, 20, and
II. INSTALLATION
This unit was designed and is used almost exclusively on compressor and turbo ex pand er seal gas systems.
REFER
TO COM PRES SOR / EX PAND ER MAN U FAC TUR ER'S MAN U AL FOR DETAILED IN STAL LA TION, START-UP
AND SHUTDOWN OF THIS UNIT.
Install regulator in ac cor dance with direction of flow arrow cast on body (1).
SECTION III
III. PRINCIPLE OF OPERATION
1. The HP-1+6+S is used to main tain a con stant
differential pressure across the seals of a
com pres sor/expander. A dif fer en tial pres sure
re duc ing reg u la tor senses the down stream or
outlet (P
2
) pres sure on the lower side of the
diaphragm and is opposed by the force of the
range spring plus an ad di tion al loading (P
LOAD
)
pressure con nect ed to the spring cham ber. The
loading (P
LOAD
) pres sure plus the range spring
(14) setting (P
SET
) equals the outlet (P
2
) pres sure
of the reg u la tor. The range spring setting (P
SET
) is
the differential setting.
SECTION II
HP-1+6+S
DIFFERENTIAL SCHEMATIC
SECTION I
CAUTION
NOT FOR STEAM SERVICE. NOT FOR OXYGEN SERVICE.
CAUTION
For welded installations, all internal trim parts, seals and
diaphragm(s) must be removed from reg u la tor body prior
to welding into pipeline. The heat of fusion welding will
dam age non-metallic parts if not re moved. NOTE: This does
not apply to units equipped with extended pipe nip ples.
CAUTION
Installation of adequate overpressure pro tec tion is
recommended to pro tect the reg u la tor from overpressure
and all down stream equip ment from damage in the event
of regulator failure.
CAUTION
Option-1+6 contains single di a phragm con struc tion. In
the event of diaphragm fail ure, the process flu id will mix
with the load ing fluid. Please alert your rep re sen ta tive so
an al ter na tive product can be se lect ed.
40). This unit is most commonly applied to develop
a constant differential pressure across a rotating
shaft seal to provide proper sealing and lubricating
conditions over varying pressure ranges. Refer
to Tech ni cal Bulletin HP-S-DIFF-TB for design
con di tions and se lec tion rec om men da tions.
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