USRE7886E - Improvement in relief-valves for water-cylinders - Google Patents

Description

1. n. BAxLEY, awa.,

B. WALLACE, Administratrix, C. E. BLAKE, Assignea RELIEF VALVES FOR WATER-CYLINDER.

No. 7,886. l Ressued Sept. 18,1877.

IlI1Illl11Il,lr11llllllllllllzllllllrgr/4 closed UNITED S'rA'luse PATENT OFFICE.

oHABLEs E. BLAKE, or sAN 'FnANo1soo, CAL., Assmann or Bornem? wALLAonADMINxsTRArmx or THOMAS H. BAILEY, DEcEAsED.

lM-PROVEMENT IN RELIEFVLVES FOR WATER-CYLINDERS.

Specification forming part o! Letters Patent No. 413,411, dated February 9, 1864; BeissueNo. 7,886, September 18, 1877; application llled May l1, 18W.

' To 'all whom. may 00mm.- l v Be it known thatl THOMAS H. BAILEY, de-v ceased, did invent a new and Improved'Valve for `Water0ylinders of Steam Fire-Engines and other Pump-Cylinders, of which the following is a full and complete description:

Previous to this invention the only valve employed for relieving the pressure upon lirehose to prevent it from bursting in ease vthe water-passage through the` hose should be come obstructedz or in case of excessive press-A ure from the en glue, was one operated by hand.

This' valve, however, was ineectual unless the engineer, or other person whose duty it was to open and close the valve, had previous notice that the pressure was increasing vorl had increased, andas these emergenciesl are always liable to occur instantaneously withont previous notice, the hose would often be bursted before Vthe reliefvalve was operated and, besides this, the excitement which always prevails at `a lire renders a strict attention .to this valve almost impossible.

THOMAS H. BAILEY, however; remedied all these dicnlties by applying a valve at some point between the engineer pump and hose nozzle that is automatic in its action-that is, it is opened .by any excess of pressure in the hose or pumpcylinder, so as todischarge an additional stream, and thereby relieve tbe'inside pressure correspondingly. upon its seat by a spring, and it will therefore resist a pressure corresponding to the power ofthe s ring, so that ordinarily it remains ut in case the pressure in the hose should be in by any means so as to overcome the 'tension of the spring, and threaten to burst the hose, .thexspring-will yield, and allow'fthewalve-toopeu and relieve the pressure.

Referring to the accompanying drawings, Figure- 1 is a central vertical sectional view ofthe valve. Fig. 2 is a central vertical sectional view, on a smaller scale, showing the v attachments of the valve to a pump-cylinder.

A is a casing, like that of an ordinary globevalve, attached, by'a screw-thread, o,'to a suitable'opening provided in the pump-cylinder'F, between the said cylinder and the'y hose or pipe` connections. B is a hollow cylinder, screwed into the top of the said easing,`

The valvev is kept;

and coming to a bearing on the `top of the material, g, .to ilt water-tight within the cyll inder BL'. {I hisvalve has-a stem, d, which tits to au opening in an. adjustable screw-cap, D,l

which' is screwed onto "the top of' thecylinder B. E is a spiral spring surrounding the valvestem, between the top of the valve and the crown .of the'screwcap D, and `adjusted by screwng'do'wn the said cap to make it prolince av greater or less pressure upon the up-- per side of the valve, so that a greater or less pressure may be required upon its under side to open it.

above the valve. G G, Fig. 2, are two hose or pipe connections, one of which may be closed by the single cock H leaving the other open. Separate cocks may be used for the two pipeconnections.

The spring E is intended to be so adjusted that when the hose or pipe connections are both or all open it willexert pressure enough upon the valve to keep it closed, but that, when one or both of the said connections are closed, the extra pressure upon the pump'and hose or pipe, acting upon the lowe'surfaceqof the valve, may raise it, and provide for a suitable escape ot water through the outlet It of y 'the casing A, and Aso relieve the pump and hoseor pipes.

The construction of the upper part ot the valve t0 t the cylinder B like 'a piston is intended to prevent any accumulation of water within the said cylinderabov'e .the valve which I would interfere with the freeopenin'gof the valve; and in ease of any water passing the piston by reason of defective packing, it will escape by the vent s.

T o enable the valve to be screwed down to bring all practical pressure upon the pumpand hose in a trial of an engine, there is a hole, d', drilled through the upper part of the screwcapD and valve-stem dy when the valve is e isa ventbole in the cylinder B, above the valve, to provide for the escape-froml the said cylinder of any 'water that may pass d different parte of n pump or hose down in its seat for the reception of a pin, by the insertion of' which the valve-stem and cap can he'connected rigidly, so that by 'slightly turning the cap the valve may be screwed down close to its seat.

A spring-valve can be veriousl applied to r the same purpose; but theabove description issumcient; w illustrate the essential features.

Having thus described the invention of the said THOMAS E. BAILEY', deceased, what I claim, enddesire to secure by Letters Patent aesole assignee of said patent, e

1. The combination, with a pump-cylinder and'hose of ahrc-engine, of n automatic relief-valve, erranged relatively thereto, substantially as specified.

2. The combination of the valve O, stem d', A

spring E, adjustable cap D, and pin-,hole d. whereby the valve may be either held upon its sent with n variable yieldinpreesnre, or may be elevated therefrom, or eld immovably thereon es nu ordinary screw-plug. 1

CEAS. E. BLAKE, Assignee.

Witnesses:

0. T. Buon F. A. Bnooxs.

Images