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New hose or pipe clip
VACUUM
News
I m p o r t a n t notice to readers For further information on any matter mentioned in Vacuum News, tear out and post one of the reader enquiry cards
M a n u f a c t u r e r s and others Manufacturers and others are invited to submit information for inclusion in this feature addressed to The Vacuum News Editor V a c u u m Pergamon Press Headington Hill Hall Oxford OX3 0BW
New
products
and
developments
N e w hose or pipe clip An entirely new design of hose or pipe clip, which is claimed to provide up to 3 times the customary diameter adjustment for each size of clip, a tightening efficiency in excess of conventional wormscrew types, and which often can be fitted like an open strap without the need to separate a coupling, is being launched internationally by Newman Industrial Controls Ltd, a Newman Industries company. Called the "Nexus" clip it is believed to be the first serious challenge to the long-established worm-screw design. The reduction in stocked sizes made possible by the new clip is said to offer substantial commercial benefits. Only 6 sizes of the new clip need to be stocked to span the diameter range covered by the typical 19 sizes of an ordinary worm-screw type. The design of the clip is simplicity itself. It comprises a notched stainless steel strip, supplied flat, which is formed by hand to approximately the diameter required and then inserted under a screw tensioning device; i.e. the notches provide the initial, coarse, adjustment of the diameter, the tensioning device then engaging with a notch to give the final tightening by screwdriver or spanner. Often, because the clip starts as an open strap, the coarse adjustment can be carried out by wrapping around a joint in-situ, without the usual necessity to separate a coupling in order to slip the pre-formed clip over the hose or pipe. The company claims that tests show that, for a given applied torque, the sealing efficiency of the Nexus clip is about double that of a conventional clip ; this, they say, is because the design permits the use of a full-thread drive of fine-pitch for the tightening screw which, combined with the two-stage adjustment, means that more of the applied torque goes into actually tightening the strap, and less is absorbed by the mechanism itself. All Nexus clips are at present made of stainless steel and cadmium plated components, so that they can be specified for most industrial environments without risk of rapid corrosion. The six standard sizes of the Nexus clip will cover pipe diameters from 13 mm (½ in.) to 150 mm (6 in.), but the design principle, and the fact that it is produced from continuous strip, enables it to be specially made to cater for practically any diameter. There is no established British Standard for this type of fullthread drive clip, but Newman Industrial Controls are confident that the design will lead to the creation of an additional standard, and independent research work is being carried out with this objective in view. Newman Industrial Controls Ltd Circle number 30 on Reader Enquiry Service card
An i m p o r t a n t advance in vacuum furnace technology Designed and manufactured by Vacuum Generators this specialized pumped Vacuum Furnace achieved a remarkable specification whilst undergoing acceptance trials. The design vacuum pressure was specified to be better than 10-6 torr at 1200°C in a hot zone 280 mm dia x 450 mm high but during trial tests, loaded with a 1 kg molybdenum specimen, it achieved 5 x 10-8 torr after 8 h at 1200°C. Temperature uniformity was better than 1 °C over the specimen with t w o thermocouples set at 45 and 140 mm from the hearth plate. This advanced specification is claimed to have been made possible by the choice of clean pumping equipment. The customer specified a completely hydro-carbon free environment and therefore Vacuum Generators, Britiain's specialist company for clean ultra high vacuum equipment, decided to use the ion/sublimation pump combination for evacuation of the furnace chamber. A 400 I. s -1 triode sputter ion pump is employed in tandem with a titanium sublimation pump housed in a separate 304 mm dia vessel which provided a pumping speed of 2800 I. s -1 at the furance chaml~er. Fore-pumping of the furance is achieved by using a twin molecular sieve sorption pumped system together with a dry vane compressor pump. To enable fast cycling of the furnace the ion/titanium pump system can be held under vacuum during loading, being isolated from the work chamber by a stainless steel bodied gate valve. The furance is fully programmable, with facilities to allow run up to temperature at a pre-set heating rate and held at temperature for a set period. A multi-point recorder is included to record temperature and pressure, together with full vacuum and furnace control instrumentation. Also available is an option to allow the cooling rate to be controlled. A battery operated warning system is built into the system to provide complete protection against service failure. Warning lights indicate each possible area of malfunction, keeping any d o w n time to the minimum. Vacuum Generators Ltd Circle number 31 on Reader Enquiry Service card
Commercial systems for m o l e c u l a r - b e a m epitaxy Varian Associates introduce the first standard, commercial system for depositing thin, single-crystal films by molecular-beam epitaxy. MBE is inherently more precise than liquidphase epitaxy or chemical vapor deposition, the t w o film-building processes n o w in general use. The new Varian system--the M BE 360--offers unprecedented accuracy in the creation of crystals that exhibit gradual or discontinuous changes in their chemical composition. For example, 477
News
I m p o r t a n t notice to readers For further information on any matter mentioned in Vacuum News, tear out and post one of the reader enquiry cards
M a n u f a c t u r e r s and others Manufacturers and others are invited to submit information for inclusion in this feature addressed to The Vacuum News Editor V a c u u m Pergamon Press Headington Hill Hall Oxford OX3 0BW
New
products
and
developments
N e w hose or pipe clip An entirely new design of hose or pipe clip, which is claimed to provide up to 3 times the customary diameter adjustment for each size of clip, a tightening efficiency in excess of conventional wormscrew types, and which often can be fitted like an open strap without the need to separate a coupling, is being launched internationally by Newman Industrial Controls Ltd, a Newman Industries company. Called the "Nexus" clip it is believed to be the first serious challenge to the long-established worm-screw design. The reduction in stocked sizes made possible by the new clip is said to offer substantial commercial benefits. Only 6 sizes of the new clip need to be stocked to span the diameter range covered by the typical 19 sizes of an ordinary worm-screw type. The design of the clip is simplicity itself. It comprises a notched stainless steel strip, supplied flat, which is formed by hand to approximately the diameter required and then inserted under a screw tensioning device; i.e. the notches provide the initial, coarse, adjustment of the diameter, the tensioning device then engaging with a notch to give the final tightening by screwdriver or spanner. Often, because the clip starts as an open strap, the coarse adjustment can be carried out by wrapping around a joint in-situ, without the usual necessity to separate a coupling in order to slip the pre-formed clip over the hose or pipe. The company claims that tests show that, for a given applied torque, the sealing efficiency of the Nexus clip is about double that of a conventional clip ; this, they say, is because the design permits the use of a full-thread drive of fine-pitch for the tightening screw which, combined with the two-stage adjustment, means that more of the applied torque goes into actually tightening the strap, and less is absorbed by the mechanism itself. All Nexus clips are at present made of stainless steel and cadmium plated components, so that they can be specified for most industrial environments without risk of rapid corrosion. The six standard sizes of the Nexus clip will cover pipe diameters from 13 mm (½ in.) to 150 mm (6 in.), but the design principle, and the fact that it is produced from continuous strip, enables it to be specially made to cater for practically any diameter. There is no established British Standard for this type of fullthread drive clip, but Newman Industrial Controls are confident that the design will lead to the creation of an additional standard, and independent research work is being carried out with this objective in view. Newman Industrial Controls Ltd Circle number 30 on Reader Enquiry Service card
An i m p o r t a n t advance in vacuum furnace technology Designed and manufactured by Vacuum Generators this specialized pumped Vacuum Furnace achieved a remarkable specification whilst undergoing acceptance trials. The design vacuum pressure was specified to be better than 10-6 torr at 1200°C in a hot zone 280 mm dia x 450 mm high but during trial tests, loaded with a 1 kg molybdenum specimen, it achieved 5 x 10-8 torr after 8 h at 1200°C. Temperature uniformity was better than 1 °C over the specimen with t w o thermocouples set at 45 and 140 mm from the hearth plate. This advanced specification is claimed to have been made possible by the choice of clean pumping equipment. The customer specified a completely hydro-carbon free environment and therefore Vacuum Generators, Britiain's specialist company for clean ultra high vacuum equipment, decided to use the ion/sublimation pump combination for evacuation of the furnace chamber. A 400 I. s -1 triode sputter ion pump is employed in tandem with a titanium sublimation pump housed in a separate 304 mm dia vessel which provided a pumping speed of 2800 I. s -1 at the furance chaml~er. Fore-pumping of the furance is achieved by using a twin molecular sieve sorption pumped system together with a dry vane compressor pump. To enable fast cycling of the furnace the ion/titanium pump system can be held under vacuum during loading, being isolated from the work chamber by a stainless steel bodied gate valve. The furance is fully programmable, with facilities to allow run up to temperature at a pre-set heating rate and held at temperature for a set period. A multi-point recorder is included to record temperature and pressure, together with full vacuum and furnace control instrumentation. Also available is an option to allow the cooling rate to be controlled. A battery operated warning system is built into the system to provide complete protection against service failure. Warning lights indicate each possible area of malfunction, keeping any d o w n time to the minimum. Vacuum Generators Ltd Circle number 31 on Reader Enquiry Service card
Commercial systems for m o l e c u l a r - b e a m epitaxy Varian Associates introduce the first standard, commercial system for depositing thin, single-crystal films by molecular-beam epitaxy. MBE is inherently more precise than liquidphase epitaxy or chemical vapor deposition, the t w o film-building processes n o w in general use. The new Varian system--the M BE 360--offers unprecedented accuracy in the creation of crystals that exhibit gradual or discontinuous changes in their chemical composition. For example, 477