GB-H-152 GAS BOOSTER PACKAGE OPERATION AND MAINTENANCE MANUAL
© 2008 DH Instruments, a Fluke Company
Page 10
2. The instrument gas section (high pressure) consists of a small piston and an inlet/outlet
check valve assembly. The small piston moves forward and backward with the air
drive piston. During the suction stroke (backward movement), the outlet check valve
closes and the inlet check valve opens letting instrument gas enter the
compression chamber. During the compression stroke, the inlet check valve closes and
the outlet check valve opens letting compressed gas out of the pump.
The compression ratio of the high pressure piston is 25:1. Maximum output pressure is
limited by the test gas supply pressure. For example, with 4 MPa (600 psi) applied,
maximum output pressure cannot exceed 4 x 25 = 100 MPa (15 000 psi).
3.1.2
BOOSTER DRIVE SHUTOFF VALVE (13)
The shutoff valve is a ball-type, 90
°
turn valve. It is used to prevent flow of regulated drive air
to the booster. This valve can be considered a booster ON/OFF switch.
3.1.3
ACCUMULATOR (9)
The accumulator is a stainless steel cylinder with an internal volume of 150 cc (9.2 in.
3
) The
accumulator serves as a reservoir of high pressure gas so the gas boosted to high pressure
can be stored. This helps to provide a continuous flow of high pressure gas to the pressure
controller the GB-H-152 supplies when the pressure controller is increasing pressure.
A DH500 fitting and plug on the bottom of the accumulator cylinder act as a drain to purge
the cylinder should liquids accumulate in it. (The GB-H-152 supply gas should be dry; the
drain does not imply that it is acceptable to supply moist test gas to the booster).
3.1.4
DRIVE AIR REGULATOR/FILTER (15)
The drive air pressure regulator (15) is a self-venting type regulator with an outlet pressure
control range of 0 to 1 MPa (150 psig). Maximum inlet pressure is 1.7 MPa (250 psig). The
control knob is pulled out to make adjustments; pushed in to lock into position and prevent
accidental changes.
The regulator also includes a filter and a filter bowl drain tap.
The regulator should be adjusted from a lower pressure to a higher pressure. This is due to
the tendency of a pressure regulator to drift in the opposite direction of the pressure
adjustment. Adjusting the regulator in this way will help avoid an overpressure condition due
to regulator drift.
The drive air adjust regulator (15) output should never be adjusted to greater than 0.8 MPa
(100 psi) on GB-H-152-70M or 0.9 MPa (130 psi) for the GB-H-152-100M. Higher drive air
pressure can result in a booster output pressure that exceeds the maximum working pressure
ratings of system components.
3.1.5
HIGH PRESSURE REGULATOR (6)
The high pressure regulator (6) is constructed of 303 stainless steel, Kel-F, Buna-N, and
Teflon wetted materials. It is a venting type regulator with an outlet pressure control range of
2 to 100 MPa (300 to 15 000 psig) for the GB-H-152-70M and 3 to 120 MPa (450 to
18 000 psig) for the GB-H-152-100M. Maximum inlet pressure is equal to the maximum
outlet pressure.
