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).
Product information leaflet for 'SAMSON' Automatic Temperature Regulators.
| Identifier | ExFiles\Box 78\3\ scan0191 | |
| Date | 20th September 1921 guessed | |
| THE STEAM FITTINGS CO. Ltd., West Drayton, Mdx. "SAMSON" Automatic Temperature Regulators. The complete Standard Regulator consists of Thermostat (A), Connecting Tube (B), Valve Controller (C), and Valve (D). A, B and C are completely filled with the operating liquid and hermetically sealed. On expansion with rising temperature, the liquid passes from the Thermostat Tube (A) to the Valve Controller (C), in which it acts on a flexible piston (P). P consists of seamless spirally corrugated tubing, of great elasticity and resiliency, manufactured by a special process from a copper alloy—tombac. This piston is hermetically attached to the Casing at E, and is capable of withstanding very great pressure. At its non-attached end the piston tube is closed by a cap into which is screwed a rod (R), which passes through the interior of the piston tube. On compression of the piston this rod acts on the valve stem, gradually closing the valve. On contraction of the liquid, with the slightest drop in temperature, the resilient piston immediately recedes, returning the liquid into the Thermostat tube and allowing a spring (S) on the Valve Stem to re-open the valve. The Regulator is set for the desired temperature by a similar piston in the Thermostat, which also acts as a safety device. Nut (N), screwed on to rod (R) of the Regulating Piston, can be turned by rotating Tube (T), but is held in position by the strong spring (S1). When the Valve is completely closed and the temperature should still continue to rise; the great pressure set up in the Thermostat tube lifts the Regulating piston and the Adjusting nut against the action of Spring (S1) thereby relieving the pressure. THE STEAM FITTINGS CO. Ltd., West Drayton, Mdx. "SAMSON" Automatic Temperature Regulators. Normally the Thermostat Tube is made in Brass, but for liquids which have a corrosive action on Brass the tube can be made from any specified material, or it can be lead-coated. It is apparent that by extending Piston (P1), liquid is displaced and must pass into the Valve Controller thereby bringing the Valve nearer its seat, and causing it to close at a lower temperature. On the other hand, temperature will be raised by contracting Piston (P1). The spiral corrugations of the tube piston cause the whole tube to take part uniformly on expansion and contraction. This has the effect of not only dividing the stress evenly over a large number of windings, but also of increasing the resiliency. It should also be noted that the Regulators contain no tight fitting parts whatsoever, and are therefore free from metallic friction. No material except metal enters into their construction, so that, except under the effect of corrosive liquids or gases there is nothing to deteriorate. For pressures above 10 lbs. per square inch, double beat Valves as shewn are used. In connection with double beat Valves, Strainers (see list 25) should always be installed, and even with ordinary Valves their use is to be recommended. The Thermostats of Room Regulators are mounted on boards; those for liquids, kilns, drying chambers, etc., are fitted with Union to screw direct into metal walls or into suitable flanges. The description given refers to “Standard” Regulators. For certain purposes—more particularly those which require a small range of temperature only—the Thermostat tube and Valve controller are combined, thereby the necessity of connecting tubing is dispensed with (see illustration above). P.T.O. | ||