dhi installation and use of 14 in. back pressure regulator kit pn 402075 User Manual

 

Installation and Use of  

1/2 in. Back Pressure Regulator Kit

 

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. 

 

  Using a backup wrench hold the female swivel stationary, 

and tighten the union 1/8 turn past finger-tight. 

 

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 

 

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. 

 

 

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.