Installation and Use of
1/2 in. Back Pressure Regulator Kit
P/N 402013
Instruction Sheet
This kit is used to upgrade a 1/2 in. single or dual
molstic-S platform that does not include the 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.
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 102923) inside the
female VCR swivel nut of the regulator’s outlet port (3).
Thread
the
included 8VCR male union (4) into the female
VCR swivel nut of the molstic-S.
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.
Using a backup wrench hold the female swivel stationary,
and tighten the union 1/8 turn past finger-tight.
INSTALLATION OF REGULATOR
ONTO MOLSTIC-S
Place a new VCR gasket (P/N 102923) securely
against the sealing surface inside the female VCR
swivel nut at the molstic-S inlet (5).
Place the regulator with its bracket on top of the
molstic-S platform. Align the male VCR outlet fitting
with the mating female VCR swivel nut and thread the
nut onto the fitting.
Using a backup wrench hold the male VCR union
stationary and tighten the VCR swivel nut 1/8 turn
past finger-tight.
Place the flat side of the 60 mm nut plate under the
molstic-S platform (Fig. 2,1). Align it with the holes in
the platform and the regulator bracket. Hold it in place.
Figure 1.
1/2 in. molstic-S, with Back Pressure Regulator
PREPARING THE REGULATOR
FOR INSTALLATION
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 female VCR swivel
nut (5) as the molstic interface. Retain the adaptor for
use on the inlet of the regulator. The VCR gaskets
used in this connection are for one-time use and
should therefore be discarded.
Figure 2.
molstic-S Nut Plate
Thread the two M4 socket head cap screws and M4 flat
washers through the regulator bracket and tighten them
securely into the nut plate.
Place a new VCR gasket (P/N 102923) securely against
the sealing surface inside the female VCR swivel nut of
the regulator’s inlet port (2).
Place a new VCR
®
gasket (P/N 102183) 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.
Over-tightening VCR connections will damage the
sealing beads and possibly cause system
leakage. Do not re-use metallic VCR gaskets.
Install the included gauge into the port and hold in place
while tightening the VCR nut 1/8 turn part finger-tight.
Install the adaptor retained from step into the inlet
port of the regulator. Using a backup wrench hold the
swivel nut stationary, and tighten the adaptor 1/8 turn
past finger-tight.
