Installation and Use of
1/4 in. Back Pressure Regulator Kit
P/N 402075
Instruction Sheet
This kit is used to upgrade a 1/4 in. single or dual
molstic-S platform that does not include an integrated
back pressure regulator. This upgraded configuration
is ideal for the situation where the device under test
(DUT) will be tested while plumbed upstream of the
molbloc-S, and where its outlet pressure must be set
and controlled precisely, or its differential pressure
must be limited.
Using a pair of properly sized wrenches remove the
VCR x tube adaptor (1) which is on the inlet end of the
molstic-S. This will leave a VCR coupler (3) as the
molstic interface. Retain the adaptor for use on the inlet
port of the regulator. The VCR gaskets are for one-time
use and should therefore be discarded.
Place a new VCR
®
gasket (P/N 102183) into the inlet
port of the regulator.
Install the adaptor retained from step into the inlet port
of the regulator. Hold the regulator stationary, and tighten
the VCR x tube adapter (1) 1/8 turn past finger-tight.
High pressure gases are potentially hazardous.
Energy stored in these gases can be released
unexpectedly and with extreme force. High
pressure systems should be assembled and
operated only by personnel who have been
instructed in proper safety practices.
INSTALLATION OF REGULATOR ONTO
MOLSTIC-S
Using a pair of properly sized wrenches remove the female
VCR coupler and filter as an assembly (3 and 4) from the
female VCR swivel nut (5). Discard the VCR gasket.
Place a new VCR gasket securely against the sealing
surface inside the female VCR coupler (3) of the
molstic-S inlet fitting.
Tighten the VCR coupler and filter subassembly to the
regulator outlet fitting 1/8 turn past finger-tight.
Place a new VCR gasket securely against the sealing
surface inside the female VCR swivel nut (5).
Place the regulator with its bracket on top of the molstic-S
platform. Align the filter assembly’s male VCR outlet
fitting with the mating female VCR swivel nut and thread
the nut onto the fitting.
Hold the filter assembly stationary with a backup wrench.
Tighten the female nut 1/8 turn past finger-tight.
Figure 1.
1/4 in. molstic-S, with Back Pressure Regulator
PREPARING THE REGULATOR FOR
INSTALLATION
Place a new VCR
®
gasket (P/N 102183) into the outlet
port of the regulator.
Thread the included VCR male union (2) into the
regulator outlet port and tighten finger-tight.
Over-tightening VCR connections will damage the
sealing beads and possibly cause system
leakage. Do not re-use metallic VCR gaskets.
Figure 2.
molstic-S Nut Plate
Place the flat side of the 60 mm nut plate (Fig 2, 1)
under the molstic-S platform. Align it with the holes in
the platform and the regulator bracket. Hold it in place.
Hold the regulator stationary, and tighten the male VCR
union 1/8 turn past finger-tight.
Thread the two M4 socket head cap screws and M4 flat
washers through the regulator bracket and tighten them
securely into the nut plate.
Attach the regulator mounting bracket to the base of the
regulator using the two included #10-32 socket head cap
screws, #10 flat washers, and the #10 lock washers. The
long side of the bracket should be perpendicular to the
direction of flow through the regulator.
Place a new VCR
®
gasket (P/N 101183) inside the
gauge port of the regulator. This port is marked “IN” on
the regulator body and is perpendicular to the axis of
flow of the regulator. Install the included gauge and hold
in place while tightening 1/8 turn past finger-tight.
