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766. Vacuum calibration of gauges
Classified
abstracts
764-781 23
22 (USA) 764. Novel pressure calibration. H E Karrer and T C Poulter Jr, Inst~m 1965,104-106.
773. A new versatile vacuum quick seal and vacuum lock. Systems
Automatic
J, 12 (Y), 22
765. Automatic
mercury positioner for McLeod gauge.
(USA)
The design of the system used is shown and consists of a precision McLeod gauge, Hg level sensors, control valves and a relay unit to couple the level sensors to the control valves. The device repeats the Hg stopping point to within 10.22 mm and requires a rise of 357 * 5 sec. R L Legan, Rev Sci Instrum. 37 (I), Jan 1966,116-l 17. 22 (USA)
766. Vacuum calibration of gauges.
Survey of vacuum gauge calibration methods in which the entire range from atmospheric to 10e9 torr and lower is discussed. It is noted that at higher pressure ranges, direct comparison with a primary standard presents no problem, but at lower pressure, reference to a primary standard can only be made by transferring to a secondary standard and then extrapolating to the range of interest. J R Rochrig, Environmental
Quarterly,
11, Sept 1965.30-35. 22
767. Calibration
of a Bayard-Alpert
( USA)
gauge for chlorine.
An ionization gauge of the Bayard-Alpert type (model RG75-P, Veeco Co) was calibrated for use in chlorine against a Knudsen gauge (Type 1A Edwards Co). The calibration was carried out with a vacuum system which was kinetic in the sense that a constant pressure was maintained by equal input and output flows of test gas. MLShaw,
RevSciInstrum,37
(I), Jan 1966,113.
(USA)
An all metal quick seal was developed for work with microwaves. The method and sequence of assembly are described. A “quick valve”, comprising a compact integral valve, lock, and pumpout system, is also described, along with details of its assembly to a quick seal with a wire probe. 0 D Matlock, Oak Ridge National Lahorator~~, ORNL_. 1965, 8 pages. 23 774. Light-tight slide.
(USA)
Describes a slide which is light-tight and also vacuum-tight vacuum systems designed to operate in the one micron region. E C Yates, Rev Went Instrum, 36 (12) , 1965,1883.
fol
24. Valves Bakeable,
pulsed
gas
valve
for plasma
physics
24 : I8 experiments. See
abstract number 712. 24 (India) 775. A pressure-sensitive magnetic valve for vacuum systems. A valve is described which minimizes pressure and moisture rise in the high-vacuum side after start-up following a power failure. This isolation-cum-air admittance valve has an air admittance port which closes synchronously with the starting of the pump. The isolation port opens only after the forepump side is evacuated to a preset pressure in the range 50&50/c of Hg. A miniature Pirani gauge circuit controls the opening and closing of the main isolation port leading to the high vacuum side. T G Varghese et al, Indian J Tech, 3 (Y), 1965,298-299. 24
23. Plumbing Simple differential pumping stage for connecting vacuum systems. See abstract number 748.
23 : 21 high- to ultrahigh-
23 768. Gas seals for vacuum recording chambers. A method of passing a recording tape through a vacuum electronic masking chamber without breaking the vacuum is described. D A Jones, Minnesota Mining and Manuf Co, Belgian Patent 28 May 1965, US Patent Appl10 Feb 1965,21 pages. 769. Sealing factors-their measurement (Israel) vacuum gasket seals.
659,220,
valve.
(USA)
The thermally-operated valve may be used in the feed system of a caesium ion rocket engine. A thermally-operated valve is provided for high temperature applications wherein a relatively large spring assisted positive closing pressure is employed to provide a gas-tight closure at a metal-to-metal seal, and yet a relatively small thermally expansive opening force is required to overcome the closing pressure and effect valve opening. J P Bagby and R L Zimmerman, NASA, US Patent 3,211,414, 12 Ott 1965.
23 and use in the design of
A general method for designing vacuum gasket seals and predicting their performance is described. The method is based on determining the sealing factor by using a regular shaped model simulating the sealing surface. Equations predicting the idealized sealing process for the model surfaces are derived. Results are compared with those obtained in actual seals, and correction factors are derived for the deviations. A Roth and A A Milani, Israel At Energy Comm, April 1965,27pages. 770. The mechanism of contact between metal surfaces-the (Japan) depth and the average clearance.
776. Thermally-operated
23 penetrating
The analysis of the mechanism of air leakage through the interstices between metal surfaces in contact or of the mechanism of thermal resistance between them is dependent on the average clearance between opposite surfaces or on the distribution of the real contact area, ie the mechanism of contact. T Tsukizoe and T H Isakado, J Basic Eng, 87 (3)) 196_5,666-674.
LLI
777. High vacuum valve. ( USA) The metal-to-metal seal vacuum valve is provided with a bellows which aids in preventing leakage through the housing cover and about the stem. The inner surface of the valve housing is provided with a metal valve seat having a relatively sharp ed& around the inner surface. The valve or sealing element is formed of a closed cylindrical chamber having conical ends which are concaved towards each other, and designed to permit the chamber to expand radially outwardly under a fluid pressure. J M Frame, US Patent 3,207,469,21 Seot 1965. 24 778. Seat design for all-metal vacuum gate valves. ( USA) Description is given of 4-in. and 12-in. bakeable eate valves and the sealing behavioir of various materials tested. T H Batzer, J Vat Sci Tech, 3 (I), Jan-Feb 1966,25- -28. 24 779. Vacuum valves.
(USA)
Review of manufacture and data on vacuum valves. L D Berriger, Instrum Control Systems, 38 (I2 1, Dee I 965, I I5 -I I 7.
23 771. Vacuum sealing technique for photomultiplier
( USA)
tubes.
The use of a photomultiplier tube and phosphor in a vacuum chamber for the detection of low energy charged particles is described. .J C Numan, Rev Scient Instrum, 63 (IZ), Dee 1965, 1887. 772. Alumlnium foil for ultrahigh-vacuum
gasket seal.
(USA)
Household Al foil may be utilized as the gasket material. The gasket can withstand high bakeout temperatures while functioning as an ultrahigh-vacuum seal. Mating flanges of similar configuration arc utilized in making the seal. A reliable seal is effected by utilizing the combination of the particular seal surface design and the gasket of Al foil. T H Batzer, AEC,
276
US Patent 3,211.478,
I2 October 1965.
780. Microwave and fast-acting accelerators. (USA)
valves
and vacuum
24 couplings
: 32 for
The high vacuum requirements of the Stanford linac plus the radiation produced by electron accelerators have made it necessary to design special vacuum and isolation components. Description of the valves, seals and other components are given. A L Eldredge et al, IEEE Trans Nucl Sri NSI2 (3)) 694.-698. 781. Improvements meters. (USA)
in or relating to vacuum
24 locks for mass spectro-
A vacuum lock for a mass spectrometer in which a sealing element is moved into a vacuum sealing position includes a fixed orifice member, a relatively movable member, and a magazine for holding a plurality
abstracts
764-781 23
22 (USA) 764. Novel pressure calibration. H E Karrer and T C Poulter Jr, Inst~m 1965,104-106.
773. A new versatile vacuum quick seal and vacuum lock. Systems
Automatic
J, 12 (Y), 22
765. Automatic
mercury positioner for McLeod gauge.
(USA)
The design of the system used is shown and consists of a precision McLeod gauge, Hg level sensors, control valves and a relay unit to couple the level sensors to the control valves. The device repeats the Hg stopping point to within 10.22 mm and requires a rise of 357 * 5 sec. R L Legan, Rev Sci Instrum. 37 (I), Jan 1966,116-l 17. 22 (USA)
766. Vacuum calibration of gauges.
Survey of vacuum gauge calibration methods in which the entire range from atmospheric to 10e9 torr and lower is discussed. It is noted that at higher pressure ranges, direct comparison with a primary standard presents no problem, but at lower pressure, reference to a primary standard can only be made by transferring to a secondary standard and then extrapolating to the range of interest. J R Rochrig, Environmental
Quarterly,
11, Sept 1965.30-35. 22
767. Calibration
of a Bayard-Alpert
( USA)
gauge for chlorine.
An ionization gauge of the Bayard-Alpert type (model RG75-P, Veeco Co) was calibrated for use in chlorine against a Knudsen gauge (Type 1A Edwards Co). The calibration was carried out with a vacuum system which was kinetic in the sense that a constant pressure was maintained by equal input and output flows of test gas. MLShaw,
RevSciInstrum,37
(I), Jan 1966,113.
(USA)
An all metal quick seal was developed for work with microwaves. The method and sequence of assembly are described. A “quick valve”, comprising a compact integral valve, lock, and pumpout system, is also described, along with details of its assembly to a quick seal with a wire probe. 0 D Matlock, Oak Ridge National Lahorator~~, ORNL_. 1965, 8 pages. 23 774. Light-tight slide.
(USA)
Describes a slide which is light-tight and also vacuum-tight vacuum systems designed to operate in the one micron region. E C Yates, Rev Went Instrum, 36 (12) , 1965,1883.
fol
24. Valves Bakeable,
pulsed
gas
valve
for plasma
physics
24 : I8 experiments. See
abstract number 712. 24 (India) 775. A pressure-sensitive magnetic valve for vacuum systems. A valve is described which minimizes pressure and moisture rise in the high-vacuum side after start-up following a power failure. This isolation-cum-air admittance valve has an air admittance port which closes synchronously with the starting of the pump. The isolation port opens only after the forepump side is evacuated to a preset pressure in the range 50&50/c of Hg. A miniature Pirani gauge circuit controls the opening and closing of the main isolation port leading to the high vacuum side. T G Varghese et al, Indian J Tech, 3 (Y), 1965,298-299. 24
23. Plumbing Simple differential pumping stage for connecting vacuum systems. See abstract number 748.
23 : 21 high- to ultrahigh-
23 768. Gas seals for vacuum recording chambers. A method of passing a recording tape through a vacuum electronic masking chamber without breaking the vacuum is described. D A Jones, Minnesota Mining and Manuf Co, Belgian Patent 28 May 1965, US Patent Appl10 Feb 1965,21 pages. 769. Sealing factors-their measurement (Israel) vacuum gasket seals.
659,220,
valve.
(USA)
The thermally-operated valve may be used in the feed system of a caesium ion rocket engine. A thermally-operated valve is provided for high temperature applications wherein a relatively large spring assisted positive closing pressure is employed to provide a gas-tight closure at a metal-to-metal seal, and yet a relatively small thermally expansive opening force is required to overcome the closing pressure and effect valve opening. J P Bagby and R L Zimmerman, NASA, US Patent 3,211,414, 12 Ott 1965.
23 and use in the design of
A general method for designing vacuum gasket seals and predicting their performance is described. The method is based on determining the sealing factor by using a regular shaped model simulating the sealing surface. Equations predicting the idealized sealing process for the model surfaces are derived. Results are compared with those obtained in actual seals, and correction factors are derived for the deviations. A Roth and A A Milani, Israel At Energy Comm, April 1965,27pages. 770. The mechanism of contact between metal surfaces-the (Japan) depth and the average clearance.
776. Thermally-operated
23 penetrating
The analysis of the mechanism of air leakage through the interstices between metal surfaces in contact or of the mechanism of thermal resistance between them is dependent on the average clearance between opposite surfaces or on the distribution of the real contact area, ie the mechanism of contact. T Tsukizoe and T H Isakado, J Basic Eng, 87 (3)) 196_5,666-674.
LLI
777. High vacuum valve. ( USA) The metal-to-metal seal vacuum valve is provided with a bellows which aids in preventing leakage through the housing cover and about the stem. The inner surface of the valve housing is provided with a metal valve seat having a relatively sharp ed& around the inner surface. The valve or sealing element is formed of a closed cylindrical chamber having conical ends which are concaved towards each other, and designed to permit the chamber to expand radially outwardly under a fluid pressure. J M Frame, US Patent 3,207,469,21 Seot 1965. 24 778. Seat design for all-metal vacuum gate valves. ( USA) Description is given of 4-in. and 12-in. bakeable eate valves and the sealing behavioir of various materials tested. T H Batzer, J Vat Sci Tech, 3 (I), Jan-Feb 1966,25- -28. 24 779. Vacuum valves.
(USA)
Review of manufacture and data on vacuum valves. L D Berriger, Instrum Control Systems, 38 (I2 1, Dee I 965, I I5 -I I 7.
23 771. Vacuum sealing technique for photomultiplier
( USA)
tubes.
The use of a photomultiplier tube and phosphor in a vacuum chamber for the detection of low energy charged particles is described. .J C Numan, Rev Scient Instrum, 63 (IZ), Dee 1965, 1887. 772. Alumlnium foil for ultrahigh-vacuum
gasket seal.
(USA)
Household Al foil may be utilized as the gasket material. The gasket can withstand high bakeout temperatures while functioning as an ultrahigh-vacuum seal. Mating flanges of similar configuration arc utilized in making the seal. A reliable seal is effected by utilizing the combination of the particular seal surface design and the gasket of Al foil. T H Batzer, AEC,
276
US Patent 3,211.478,
I2 October 1965.
780. Microwave and fast-acting accelerators. (USA)
valves
and vacuum
24 couplings
: 32 for
The high vacuum requirements of the Stanford linac plus the radiation produced by electron accelerators have made it necessary to design special vacuum and isolation components. Description of the valves, seals and other components are given. A L Eldredge et al, IEEE Trans Nucl Sri NSI2 (3)) 694.-698. 781. Improvements meters. (USA)
in or relating to vacuum
24 locks for mass spectro-
A vacuum lock for a mass spectrometer in which a sealing element is moved into a vacuum sealing position includes a fixed orifice member, a relatively movable member, and a magazine for holding a plurality