Ashcroft Options User Manual

259

PRESSURE INSTRUMENTS

PROCESS GAUGES

ACCESSORIES
& OPTIONS

INDUSTRIAL GAUGES

STAINLESS STEEL CASE GAUGES

SANITARY GAUGES

TEST INSTRUMENTS

DIAPHRAGM SEALS/INSTRUMENT ISOLATORS

COMMERCIAL GAUGES

SPECIAL APPLICATION COMMERCIAL GAUGES

PRESSURE TRANSDUCERS/TRANSMITTERS

TEMPERATURE INSTRUMENTS

ACCESSORIES AND OPTIONS

Throttle Screws ........................................... 261

Pulsation Dampener .................................... 261

Pressure Snubber........................................ 261

Steel Needle Valve ....................................... 262

Siphons ....................................................... 262

Chemiquip Valve Snubber ........................... 263

Chemiquip Limiting Valve ........................... 263

Diaphragm Seals ......................................... 263

Electric Warning Contacts ........................... 264

Conversion Kit ............................................. 264

1

4

/2˝ Ring Wrench, Type A-1285 ................... 265

6˝ Ring Wrench, Type A-1286 ...................... 265

1

2

/2˝ & 31/2˝ Type 1009 Duralife Tools .......... 265

Cone Tool, Type A-1287 ............................... 266

Tool Kit, Type 1105T ..................................... 266

Hand Jack Set, Type 3220 ........................... 266

Cocks, 1092 Tea Handle .............................. 266

Cocks, 1094 Lever Handle Union ................ 266

Cocks, 1095 Lever Handle ........................... 266

Test Gauge Carrying Case 2005 .................. 266

Options .................................................267-268

BIMETAL THERMOMETERS

DIRECT-READING THERMOMETERS

HANDHELD THERMOMETERS

REMOTE-READING GAS THERMOMETERS

REMOTE-READING VAPOR THERMOMETERS

DIGITAL THERMOMETERS

TEMPERATURE REGULATORS

THERMOWELLS

PRESSURE/TEMPERATURE SWITCHES

PRESSURE SWITCHES

TEMPERATURE SWITCHES

ACCESSORIES & OPTIONS

Consult factory for guidance in product selection
Phone [phone] or visit our web site at
www.ashcroft.com

APPLICATION DATA

260

Consult factory for guidance in product selection
Phone [phone] or visit our web site at

www.ashcroft.com

261

Ashcroft® Accessories

Throttling Devices

A throttling device should be used when a pressure gauge is
subjected to rapid pressure fluctuations, which make the gauge
difficult to read because of rapid pointer movement. Such a
device reduces pressure impact, slows the speed and range of
pointer movement, and prolongs gauge life.
Throttling effect is obtained by installing a restricting orifice
between the gauge socket connection and the Bourdon tube.
Severe service applications are characterized by the presence of
significant levels of pressure pulsation and/or vibration. Gauges

THROTTLE SCREWS

The simplest means of providing a
restriction in the socket, a throttle screw
or throttle plug, 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
gauges and a 0.0135, on 25-35 1009
and 63 and 100mm 1008S.

PULSATION DAMPENER

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 po­sition. Maximum pressure is 5000 psi.

Type NPT
Number Conn. (oz.)

25-1106B 1⁄4 Brass 4

50-1106B 1⁄2 Brass 8
25-1106D 1⁄4 Steel* 4
50-1106D 1⁄2 Steel* 8

25-1106S 1⁄4 Stainless steel 4

50-1106S 1⁄2 Stainless steel 8

* Internal parts are stainless steel.

should be protected from severe pressure pulsation by the
inclusion of a dampener such as a throttle plug/screw or porous
metal snubber. If the pulsation is extreme, a liquid-filled gauge,
with dampener, should be used. A liquid-filled gauge will also last
significantly longer than a comparable dry gauge when vibration
is present. If the vibration levels are extreme, the only solution
may be to remotely mount the gauge away from the source of
vibration. In that case capillary tubing may be used to connect
the gauge to the pressure source.

Throttle screw

®

pressure

Weight

Material

PRESSURE SNUBBER

Type NPT

Number Conn. Housing Filter Disc Rating

25-1112B 1⁄4
50-1112B
25-1112S 1⁄4
50-1112S
25-1112M
50-1112M

Porosity

Opening (Inches) Diff. Press.

D 0.005 6.5

E 0.0025 3.0

G 0.0008 1.1

HX 0.0006 0.4

Material

1

⁄2

1

⁄2

1

⁄4

1

⁄2

Max Pore Cap. CFH at 1 psi

Brass

303

stainless steel stainless steel

R Monel Monel 15,000

stainless steel

Max psi

316

10,000

316

15,000

For use with

Oil

(50 to 500 S.S.U.)

Water & Light Oils

(Under 50 S.S.U.)

Air, Steam
and Gases

Mercury

Manomometers

Consult factory for guidance in product selection
Phone [phone] or visit our web site at
www.ashcroft.com

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 orifice­type devices. All-metal construc­tion permits the snubber to be
washed in a variety of common
solvents.