Installation of Regulator Kit
onto 1/2 in. molstic-S™
Mounting Platform
P/N 401881
Instruction Sheet
This kit is used to upgrade 1/2 in. single or dual
molstic-S platforms that do not include the integrated
pressure regulator. This upgraded configuration is
ideal for the situation where the device under test
(DUT) will be tested while plumbed downstream of the
molbloc-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.
Thread the VCR male union (6) into the regulator’s outlet
port female VCR swivel nut and tighten finger-tight.
Using a backup wrench hold the swivel nut stationary,
and tighten the male union 1/8 turn past finger-tight.
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.
INSTALLATION OF REGULATOR ONTO
MOLSTIC-S
Using a pair of properly sized wrenches remove the
VCR x tube adaptor which is on the inlet end of the
molstic-S. This will leave a female VCR swivel nut (7)
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 VCR gasket securely against the sealing
surface inside the female VCR swivel nut (7).
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.
Figure 1. 1/2 in. molstic-S, with Regulation
PREPARING THE REGULATOR FOR
INSTALLATION
Place a new VCR
regulator’s inlet port female VCR swivel nut (4).
Place the VCR male nut (3) over the tube adaptor (2)
and thread it into the regulator’s inlet port female VCR
swivel nut (4) 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.
Using a backup wrench hold the female swivel stationary,
and tighten the adaptor 1/8 turn past finger-tight.
Install the quick connect body (1) onto the tube fitting
and tighten 1-1/4 rotations beyond finger-tight.
Place a new VCR gasket into the regulator’s outlet port
female VCR swivel nut (5).
®
gasket (P/N 102923) into the
Using a backup wrench hold the male VCR union
stationary and tighten the VCR swivel nut 1/8 turn past
finger-tight.
Figure 2. molstic-S Nut Plate
Place the flat side of the 60 mm nut plate under the
molstic-S platform (See Figure 2). Align it with the holes
in the platform and the regulator bracket. Hold it in place.
Thread the two M4 socket head cap screws and M4 flat
washers through the regulator bracket and tighten them
securely into the nut plate.
SYSTEM PRESSURIZATION AND
REGULATOR ADJUSTMENT
clockwise raises the outlet pressure. Rotate
counterclockwise to lower the outlet pressure. Increase
the system pressure to the desired DUT operating
pressure. Make final adjustments of control pressure in
the direction of increasing pressure in order to obtain the
During system operation, be extremely careful
not to apply pressure in excess of the maximum
operating pressure of the molbox: 600 kPaa
(87 psia) for molbox1-A700K; 250 kPaa (36 psia)
for molbox1-A350K.
Once the test system with molbloc-S and molstic-S has been
completely interconnected, the following procedure should
be used for its safe pressurization and operation.
The outlet pressure of a pressure reducing regulator is
controlled by adjusting the position of the control knob.
Rotating the knob in the clockwise direction raises the outlet
(control) pressure. Counterclockwise rotation, coupled with
venting of the downstream side of the regulator plumbing,
lowers the outlet pressure. molstic-S regulators are NOT
self-venting so the outlet pressure will not decrease with
counterclockwise rotation of the control knob unless the
downstream gas is allowed to escape.
Make final adjustments of control pressure in the direction of
increasing pressure in order to obtain the most accurate and
stable set point.
most accurate and stable set point.
Adjust the regulator to obtain the desired operating
pressure. Provide additional margin only if the final pressure
will be within the safe operating range of the molbox.
Regulator Adjustment
Once the regulator has been adjusted to the desired
pressure its adjusting stem should be locked down to
prevent further adjustments. This will help protect the
molbox RPTs from over-pressurization.
Remove regulator knob cover: Use a small flat
screwdriver to remove the plastic cap on the top of the
regulator adjustment knob.
Loosen jamb nut: Using the properly sized socket
wrench, loosen the jamb nut located on top of the
adjustment knob.
Adjust knob position: Rotate the regulator adjustment
knob clockwise until it gently bottoms out against the
regulator body.
Tighten jamb nut: Hold the adjustment knob in
position while using the socket wrench to tighten the
System Pressurization
Set inlet pressure to minimum: Turn the regulator’s
adjustment knob counterclockwise until the spring force
has been relieved, and if so equipped close the shut-off
directly downstream of the pressure control regulator.
Open molstic-S flow control/shut off valve(s):
Valves must be open to allow test gas to fill the test
system.
Plug-off/cap-off system: Place a cap or plug
(as applicable) on the outlet fitting of the test system.
Isolate from vacuum system: If the outlet plumbing of
the molstic-S flows into a vacuum pump, disconnect or
otherwise isolate from the vacuum system. When capping
off ISO-KF style flanges use overpressure rings to
insure a leak free connection at positive line pressure.
Open DUTs flow control valve: If the test system
contains a DUT that has flow control capability, it must
be slightly opened in order to allow pressure to pass
through. All that is necessary is a small flow to allow the
system to fully pressurize.
Display system pressure: Monitor the system
pressure as measured by molbox by pressing the [P&T]
function until the pressure is displayed. Refer to molbox
Operation and Maintenance Manual for details.
Turn on gas supply: Apply the supply pressure to the
pressure control regulator.
Slowly raise system pressure to desired test
pressure: Rotating the regulator’s control knob
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 560065 030425
jamb nut against the top of the adjustment knob.
Retest system pressure: Vent the system pressure.
Repeat system pressurization procedure to verify the
regulator pressure setting. Readjust if necessary.
Replace regulator knob cover: Place the regulator
adjustment knob cover back on top of the knob and
gently snap back in place.
The following parts are included in the shipment:
DESCRIPTION QTY PART NO.
Regulator, pressure reducing 1 103232
Regulator bracket 1 123657
Adaptor, 8VCR x 8T 1 103233
Male nut, 8VCR 1 103029
Gasket, 8VCR 4 102923
Quick connect body 1 103234
Quick connect stem 1 103235
Union, 8VCR male 1 103236
SHC screw, #10-32 x 3/8 2 103277-Z
Split lock washer, #10 2 103021-Z
Flat washer, #10 2 103278-Z
SHC screw, M4 x 12 2 101016-Z
Flat washer, M4 2 100918-Z
Nut plate, 60 mm 1 123621
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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