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Throttle Screws

The simplest means of providing a
restriction in the socket, a throttle screw,
should be ordered with the gauge.
Threaded or pressed into an instrument
socket, the throttle screw orifice selected
is based on the viscosity of the pressure
fluid, rapidity of pressure fluctuations,
and the amount of dampening effect
desired.
A smaller orifice should be used for low
viscosities, high frequencies, high
pressure and reduced pointer amplitude.
To accommodate these variables, throttle
screws are available in these sizes:
0.0135, 0.020, 0.031, 0.040, and 0.070
inches, in brass and stainless steel. When
orifice size or service condition is not
specified, a 0.020-inch orifice will be
supplied on Duragauge pressure gauges
0.0135, on 25-35 1009 and 63 and
100mm 1008S.

Pulsation Dampeners
Type 1106

Threads onto a gauge socket and provides restriction by means of a ­moving pin, which may be placed in either of five different sized holes, and thus allows the user to vary the amount of dampening to suit requirements. The pulsating pressure moves the pin up and down, providing a self-cleaning action. Dampeners are shipped with a pin in the “middle” hole, and may be used in either a vertical or horizontal po-sition. Maximum pressure is 5000 psi.

Pressure Snubbers
Type 1112

Used for dampening and filtering, the
snubber has a metal disc available in
four standard grades of porosity. The
one best suited for the application can
be selected from the chart, using the
same guidelines as for ­throttle screws.
Due to the large filter area, the snubber
has less tendency to clog than orifice-type
devices. All-metal construction permits
the snubber to be washed in a variety of
common solvents.

Chemiquip Pressure
Limiting Valve Snubber

Assures positive, repeatable performance
of the instrument by protecting against
surges and pulsations. Automatically
shuts off when overpressure occurs and is
restored when pressure falls below preset
values.

Campbell Micro-Bean

This precision valve has a very long taper on the plug, which will permit precise adjustment of the dampening effect. A filter is built into the valve in order to keep foreign matter from plugging the fine orifice. The MICRO-BEAN is made of 1½˝ hexagonal bar stock and is 4˝ in length. Turning the handwheel produces the degree of dampening required.

Steel Needle Valve

The steel needle valve is an economical, adjustable throttling device for any severe gauge application where the precise adjustment of the Campbell MICRO-BEAN® is not required. It provides the most practical means for varying the orifice to determine the exact orifice for any specific service condition. The valve has an internal seat and is of bar stock construction.

Electric Warning Contacts

The Ashcroft® 2265 electric contact is an
ideal accessory to turn on a signal light,
sound an alarm, or operate a pump or
valve. The contacts can easily be set so
that a circuit can be closed or opened at
a desired pressure or temperature.

Settings can be easily made in the field
without removing the instrument from
service. Contact adjustment is made
externally with a removable key to make
the instrument virtually tamper proof.

The contact is designed for easy
installation on Types 1279, 1377 and 1379
Duragauge pressure gauges (either stem
or flush mounted), Type 1125 differential
pressure gauges, or Type 600A Duratemp
dial thermometers.

Contacts are equipped with adjustable
magnets to eliminate chatter caused by
vibration. A plug-in connector with five
feet of electrical cable is standard.

Siphons

In order to prevent live steam from entering a pressure gauge bourdon tube, a siphon filled with water should be installed between the gauge and the process line. If ­freezing of the condensate in the loop of a siphon is a possibility, a diaphragm seal should be used to isolate the gauge from the ­process steam. Also use siphons whenever condensing hot vapors (not just steam) are present.

• Pig Tail Siphon–Number 1100 Series, 1⁄4˝ sizes: to 500 psi and 400°F.
• Coil Pipe Siphon­–Number 1098 Series, 1⁄4,˝ 1⁄2˝ sizes: to 9550 psi and 400°F.

 

Chemiquip Pressure
Limiting Valve

Protects pressure instruments against surges and pulsations. Provides automatic positive protection and accurate, repeatable performance. Automatic pressure shut-off. Built-in snubber enhances instrument, protecting ­performance.

Maximum Pointer

Available for gauges 4½˝ size and larger. Indicates maximum pressure attained. Can be reset by a knob on outside of window.

1278M Flush
Mounting Ring

Used to flush-mount gauge types 1188, 1220, 1279 and 1379. Standard finish is black; polished stainless steel finish is available at an extra charge, 4½˝ and 6.˝

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Ashcroft's OH-1 Catalog.This downloadable section contains additional information on the
products shown above, as well as other options and accessories not shown.

Accessories & Options

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