molbloc, molbloc-S, molbox, molstic and molstic-s are trademarks, registered and otherwise, of
DH Instruments, Inc.
VCR is a registered trademark of the Swagelok Company.
Document 560056
041215
DH Instruments, Inc.
4765 East Beautiful Lane
Phoenix AZ 85044-5318
USA
Tel 602.431.9100
Fax 602.431.9559
www.dhinstruments.com
Installation of 1/2 in. Filter Kit
P/N 401888
Instruction Sheet
This kit is used to provide filtration for 1/2 in. molbloc
flowpaths, especially for 1/2 in. molstic-S and molbloc-
S installations. Unlike most DHI molstics, the1/2 in.
molstic-S does not include a filter because
contamination is not a likely problem for the larger
diameter molbloc-S elements that are normally
installed on it. For customers who expect the
presence of significant particulate contamination, or
want to maintain very clean gas, this 1/2 in. filter kit
can be installed upstream of critical molstic-S
components. The kit may also be used for extra
filtration on 1/2 in. supply lines to other molstics.
INSTALLATION OF 1/2 IN. FILTER KIT
ONTO 1/2 IN. MOLSTIC-S
(SINGLE OR DUAL)
The filter kit can be installed on the upstream side of a
single or dual channel 1/2 in. molstic-S. If there is no
regulator installed on the molstic-S, the filter will fit
completely over the molstic base.
If there is a regulator installed on the molstic-S, the filter
kit should generally be installed upstream of the
regulator. In this installation, the filter will extend beyond
the upstream side of the molstic. If this is inconvenient,
the filter kit can be installed on a supply line upstream of
the molstic instead.
Figure 1.
Dual
1/2 in. molstic-S, with 1/2 in. Filter Kit
To
permanently
install the filter kit:
Using a pair of properly sized wrenches, remove the
VCR x tube adaptor that is on the inlet end of the
molstic-S. This will leave a female VCR swivel nut
(5) as the molstic interface. Retain the tube adaptor
for future use. The VCR gaskets used in this
connection are for one-time use and should
therefore be discarded.
Place a new VCR gasket securely against the
sealing surface inside the female VCR swivel nut .
Align the filter downstream fitting (4) in the VCR nut
(5) and thread the nut onto the fitting by hand. The
filter should be installed with the printed arrow
pointing in the direction of the gas flow.
Using two wrenches, tighten the filter’s downstream
male VCR connector (4) into the female nut (5) 1/8
turn past finger-tight.
Thread the 8VCR female coupling (2) onto the filter
upstream connector (3). Place a new VCR gasket
securely against the sealing surface of the filter
upstream fitting inside the 8VCR female coupling.
Thread the VCR x tube adaptor fitting (1) from the
original molstic inlet into the 8VCR female coupling
(2). The coupling should be threaded onto both
male fittings so that the VCR gasket is centered in
the coupling.
Using two wrenches, tighten the two male nuts from
the tube adaptor (1) and filter upstream fitting (3)
against each other in the coupling. The connection
should be tightened 1/8 turn past finger-tight.
To
temporarily
install the filter kit:
Using a pair of properly sized wrenches, remove the
VCR x tube adaptor that 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
future use. The VCR gaskets used in this
connection are for one-time use and should
therefore be discarded.
Place a new 8VCR o-ring securely against the
sealing surface inside the female VCR swivel nut.
