Instruments for semiconductor gas delivery applications. The entire Ashcroft team is committed to improving your experience, including the President. Steve wants to hear from you. Email him directly at commentsforsteve ashcroft.
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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. If the pulsation is extreme, a liquid-filled gauge, with dampener, a diaphragm seal and or capillary are recom-mended.
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. Capillary tubing may be used to connect the gauge to the pressure source. The most economical method to dampen pulsation and pressure spikes is with a throttle screw or throttle plug. Threaded or pressed into an instru-ment socket, the throttle screw orifice selected is based on the viscosity of the pressure fluid, rapidity of pressure fluc-tuations, and the amount of dampening effect desired.
A smaller orifice should be used for low viscosities, high frequencies, high pressure and reduced pointer ampli-. To accommodate these variables, throttle screws are available in these sizes: 0. When orifice size or service condi-tion is not specified, a 0. Threads onto a gauge socket and pro-vides restriction by means of a moving pin, which may be placed in either of five different sized holes, and this 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 psi. Used for dampening and filtering, the snubber has a metal disc available in four grades of poros-ity. 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.
Brass 10, B 12 stainless steel S 14 15, S 12 stainless steel stainless steel M All specifications are subject to change without notice. All sales subject to standard terms and conditions. Ashcroft Inc. Protects pressure instruments against surges and pulsations. Provides automatic posi-tive protection and accurate, repeatable performance. Automatic pressure shut-off. Built-in snubber enhances instrument, protecting performance.
High viscous fluids over S. C Oil S. D Water and light oils S. E Vapor and low viscosity fluids Below 30 S. 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. The steel needle valve is an economical, adjustable throttling device for any severe gauge application. 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. Used when live steam is present in the process, 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 may occur, a diaphragm seal should be used to isolate the gauge from the process steam. Also use siphons whenever. The Ashcroft 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.
Log in Get Started. Ashcroft Accessories - Pressure Dampening? Download for free Report this document. Embed Size px x x x x Transcript of Ashcroft Accessories - Pressure Dampening? Ashcroft Accessories -Pressure Dampening 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.
A smaller orifice should be used for low viscosities, high frequencies, high pressure and reduced pointer ampli- tude. Oil 50 to S.
Type Number Conn. F Air or other gases G Extreme gas pulsations HX Assures positive, repeatable performance of the instrument by protecting against surges and pulsations. E F Weight oz. All rated psi air.
Ashcroft Accessories - Pressure Dampening ?· Ashcroft® Accessories - Pressure Dampening Devices...