From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Catalog page for various models of Edwards vacuum taps with illustrations and pricing.
| Identifier | ExFiles\Box 167\2\ img116 | |
| Date | 30th March 1938 guessed | |
| B.14. EDWARDS VACUUM TAPS The success of a vacuum system is dependent on the stop-cocks used being quite free from leakage. We designed, therefore, a special series of high quality oil-sealed hard-gunmetal taps, suitable for pressures as low as 1/1000th of a millimetre. These are made in a number of forms as described and illustrated. Extreme care is taken to ensure the accurate fitting of the components and this, together with the presence of the viscous sealing compound in the upper portion of the tap, prevents any leakage of air into the vacuum system. The corrugated nozzles of the taps are screwed internally to receive non-corrodible filters which prevent the entrance of solids and they may also be fitted with inaccessible throttles to prevent one user interfering with the vacuum of other users on the same pipe line. LESS 10% DISCOUNT. £ s. d.{John DeLooze - Company Secretary} 406 Wall Type, drilled up to ¼" bore, each end screwed ¼" gas male ... 12 0 450 Ditto, but ¼" bore screwed ¼" gas female ... 1 6 451 Ditto, but ½" bore screwed ½" gas female ... 1 10 0 452 Ditto, but 1" bore screwed 1" gas female ... 1 13 0 407 As No. 406 but with one end corrugated for rubber tubing ... 11 6 408 Pillar type, 1" bore, bottom flange 2¼" diameter screwed ½" gas thread female ... 14 0 409 Ditto, two-way, connecting alternatively either side nozzle to lower opening ... 16 0 453 Ditto, two-way but ½" bore, screwed ½" female ... 1 10 0 455 Ditto, two-way but 1" bore screwed 1" female ... 3 10 0 411 Ditto, two-way, ¼" bore but without flange, lower opening screwed ¼" gas thread ... 15 6 412 Pillar type, ½" bore, shape as No. 409, but with solid base. Straight through, nozzle to nozzle ... 16 0 413 Wall type off centre pattern, ½" bore suitable for very heavy wear, one end screwed ½" gas thread and one corrugated ... 12 0 414 Gunmetal "T" for soldering, one outlet screwed ¼" gas thread ... 3 9 415 Ditto, elbow, one outlet screwed ¼" gas thread ... 3 6 416 Fitting throttle to any ½" bore tap ... 1 0 417 Fitting filter to any ½" bore tap ... 1 6 C.P. Extra for chromium plating, ¼" or ½" tap ... 2 6 N.P. Extra for nickel plating ... 1 6 Ox. Extra for Oxydising ... 1 0 The normal finish of the taps is polished gunmetal. Steel types are also supplied. These taps are not suitable for high pressure work but we make special patterns in one or two sizes suitable for both low and high pressures. Details on application. W. EDWARDS AND COMPANY ALLENDALE WORKS, VAUGHAN ROAD, LONDON, S.E.5 Inland Telegrams: EDCOHIVAC, PHONE, LONDON (Two Words). Telephone: BRIXTON 1195. Foreign Telegrams: EDCOHIVAC, LONDON. Codes used: A.B.C. 4th & 5th Editions. | ||