Calibration Solutions
for Pressure
and Flow™
PK-mol-4VCR-8VCR-3/8SWG
Adaptor Kit
Installation Instructions
ADAPTOR KIT, P/N 401820, INCLUDES
QTY PART NO DESCRIPTION
4 102070 O-ring, 2-202 Brown Viton
4 102912 O-ring, 2-207 Brown Viton
1 103026 Adaptor, 4VCR F x 8VCR F
2 103027 Gland, 8VCR x 3/8 in. tube
1 103028 Adaptor, 8VCR M x 3/8 in. SWG
2 103029 Nut, 8VCR M (male)
2 103030 Nut, 3/8 in. SWG
2 103031 Ferrule, Front 3/8 in. SWG
2 103032 Ferrule, Rear 3/8 in. SWG
2 103040 Nut, 8VCR F (female)
This adaptor kit is for making flowpath connections
between a mid flow or high flow molstic™ or a
mid/high flow metering valve kit and DUTs (devices
under test) having 1/2 in. VCR or 3/8 in. Swagelok
®
connections. The kit can also be used to adapt from
a 1E5 molbloc’s 1/2 in. VCR male inlet and outlet
fittings to 3/8 in. Swagelok when no molstic is used.
INSTRUCTIONS
When Using a High Flow molstic:
The high flow molstic outlet fitting is 1/2 in. VCR female.
• DUTs with 1/2 in. VCR male fittings can be
connected directly to the available 1/2 in. VCR
female connector on the molstic.
• To adapt from the molstic’s 1/2 in. VCR female
fitting to a device with a 3/8 in. Swagelok
connection, use an 8VCR gland with an 8VCR
male nut to connect to the molstic and connect
directly to the DUT using 3/8 in. SWG nut and
ferrules on the tube end of the 8VCR gland.
• To adapt from the molstic’s 1/2 in. VCR female
fitting to a 3/8 in. tube which leads to another
device, connect the tube to the molstic using the
8VCR M x 3/8 in. SWG adaptor.
When Using a Mid Flow molstic (without metering
valve kit):
The mid flow molstic outlet fitting is a 1/4 in. VCR
female union. To connect to devices with larger fittings,
first replace the 1/4 in. union with the 4VCR F x 8VCR F
adaptor. The bracket that supported the 1/4 in. VCR
union must be removed from the molstic using a 3
mm Allen wrench. There is no bracket included to
support the 4VCR F x 8VCR F adaptor. After installing
the 4VCR F x 8VCR F adaptor, connect to other
devices using the high flow molstic instructions
above.
When Adapting from a Mid/High Flow Metering
Valve Kit:
The mid/high flow metering valve kit may be installed
on either a mid flow or high flow molstic. Like the mid
flow molstic, the metering valve kit has a 1/4 in. VCR
female union at its outlet. To connect to devices with
larger fittings, first replace the 1/4 in. union with the
4VCR F x 8VCR F adaptor. The bracket that
supported the 1/4 in. VCR union must be removed
from the molstic using a 3 mm Allen wrench. There is
no bracket included to support the 4VCR F x 8VCR F
adaptor. After installing the 4VCR F x 8VCR F
adaptor, connect to other devices using the high flow
molstic instructions above.
When Connecting to the 1E5 molbloc (without
molstic):
When a 1E5 molbloc is used without a molstic, this
adaptor kit will connect the molbloc’s 1/2 in. male
VCR fittings to 3/8 in. Swagelok devices or
connectors. Use an 8VCR gland with an 8VCR female
nut on each end of the molbloc. Use the 3/8 in.
Swagelok nuts and ferrules for the tube end of each
gland.
PK-mol-4VCR-8VCR-3/8SWG Adaptor Kit
Installation Instructions
PROCEDURES FOR MAKING
CONNECTIONS
Soft O-Rings
• Always use the soft Viton O-rings provided for making VCR
connections to the molbloc.
The O-rings supplied for making molbloc and other VCR
connections are:
• Size: For 1/2 in. VCR fittings: 2-207 (Parker
Seal Group, O-Ring Division)
For 1/4 in. VCR fittings: 2-202 (Parker
Seal Group, O-Ring Division)
• Material: Fluorocarbon rubber (FKM), Viton
Four (4) of each size O-ring are supplied in this
adaptor kit. If frequent fittings changes will be made,
replacement O-rings should be purchased. Avoid
using a dirty or damaged O-ring.
To Connect VCR Fittings:
Place the O-ring securely against the sealing
surface inside the female nut.
Insert the male fitting and tighten by hand until
resistance is felt when the O-ring begins to compress.
When connecting an adaptor directly to the
molbloc, hold the molbloc by hand and rotate the
female nut.
Turn the nut an additional 1/2 turn beyond the
point of resistance. A wrench may be used on the
nut if desired, but do not tighten beyond 1/2 turn.
If more than 1/2 turn is needed to make a leak free
connection, the O-ring may be damaged and
should be replaced.
• Never use wrenches to hold the molbloc body.
To make original Swagelok connections,
Seat the tube fully into the Swagelok fitting and,
using fingers, turn the nut until resistance is felt.
Turn the nut 1 1/4 turns beyond this point of
resistance with a wrench.
For reconnecting fittings later, return the nut to the
point of increasing resistance, then turn slightly
more with a wrench.
molbloc and molstic are trademarks, registered and otherwise, of DH Instruments, Inc.
Swagelok and VCR are registered trademarks of the Swagelok Company.
Viton is a registered trademarks of DuPont deNemours Company
Document 560044 011220
DH Instruments, Inc.
4765 East Beautiful Lane
Phoenix AZ 85044-5318
USA
Tel 602.431.9100
Fax 602.431.9559
dhi@dhinstruments.com
www.dhinstruments.com
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