US359949A - Valve - Google Patents

Description

(No Model) G. T. WLSON.

4 VALVE. 310.359,94). Patented Mar. 22, 1887.

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UNITED STArEs PATENT Ormes,

GEORGE T. VILSON, OF BOSTON, ASSIGNOR OE OSE-HALE TO JULIAN DESTE, OF SALEM, MASSACHUSETTS.

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SPECIFICATION forming part'of Letters Patent No. 359,949, dated March 22, 1887.

Application filed Januarv 8, 1887.

To alla/hom it may concern..-

Be it known that I, GEORGE T. VILSON, of Boston, in the county of ASuffolk and State of Massachusetts, have invented a new and useful Improvement in Valves, of which the following is a specication.

The object of the invention is to provide a valve apparatus to regulate the passage of vaporous and gaseous substances, especially steam, so arranged that, first, such a substance may pass through the valveseat to the outletpipe until the back pressure it exerts has reached the maximum pressure it is intended it should exert and tends to rise above it, and that then it should cease to pass through, and, that, second, such a substance may not pass through the valve-seat to the outlet until it exerts the maximum pressure it is intended that it should exert, and that it should cease to pass through when the pressure it exerts is less than 'the maximum back -pressure intended. 4

In my invention the valve-seat has a prolongation provided with a port or ports, preferably the latter, around which the main valve tits tightly. The prolongation of the valveseat is further provided with a valve -seat valve.

To attain the object of my invention above 'numbered first,77 said valve-seat valve is kept open by a force equal to the maximum pressure it is intended that the backA pressure should exert, in order that steam may pass through the prolongation of the valve-seat to the inner area of the main valve and raise said main valve and open said ports to the passage of steam, the valve-seat valveclosing when it is relieved of said force, allowing thereby the valve-closing spring to close said main valve and shut said ports to the passage of steam.

To attain the object of my invention above numbered second, said valve-seat valve is kept closed by a force equal to the maximum pressure-high pressure-it is i ntended should be exerted, said valveseat valve opening when relieved of said force, in order that steam may pass through the prolongation of the valve` seat to the inner area of the main valve, and raise said main valve against the pressure of the valve-olosing spring and open said ports to the passage of steam.

In the drawings, Figure l represents a seetional elevation of an apparatus embodying my invention, arranged to attain the object ot' my invention above numbered lirst7 Fig. 2 represents a sectional elevation of a modilieation of the apparatus shown in Fig. l, arranged to serveas a relief-valve to attain the object of my invention above numbered seeond.77

In Fig. 1, C is the valve case, which has the inlet A and outlet B'. The valve seat T' has the prolongation G', which is provided with the ports P', and is also provided with the valve-seat valve n, as shown. The valve-stem r of this valve 'u passes through the opening M in the prolongation of the valve-seat, and passes loosely through the valve V' to admit of a slight leakage of steam to avoid formingy temporarily a cushion when the valve V' closes,

and is provided with a nut, n, and carries a spring, s, as shown. The prolongation Ghas the packing-grooves w w. s is the valve-clos ing spring, com pressed bet-Ween the valvecase cap K' and the shoulder 71- of the valve V' when the valve V' is raised. The valve-case cap K has the perforationsf for the passage of steam to the diaphragm D. The cover U screws to l the valve-case C' and contains the spring S',

through which passes the rod It'. This rod It' is provided with the disk Q, against which the spring S bears when the compressingnut N', which turns in the cover II', is turned against the spring S', compressing said spring, and causing the disk Q, to bear through the diaphragm D upon the nut n of the valve-stem r, and thereby open the valve-seat valve o.

The operation is as follows: The compressing-nut Ejis turned against the spring S', and the spring compressed thereby sufficiently to resist a pressure not greater than the maxi-l mum pressure intended. The spring S', by means of the disk Q, bears through the dia 4phragm D upon the valve-stem r, and forces said valve-stem down against the lifting force of the spring s, opening thereby the valve-seat valver. Steam enters through the inlet A into the prolongation Gr' of the valve-seat, passes through the opening M, and presses against the inner area, L', of the valve V',

and lifts this valve V against the pressure of the valve-closing spring s', opening thereby the ports l of the valve-seat, through which steam passes to the outlet B. The steam also ills the valve-case Cl and, passes through the perforations f in the valvecase cap K', and presses against the diaphragm D. The steam, pressing against the diaphragm D, when it exerts the maximum pressure intended and tendsV to rise above it, forces up the disk Q and spring S, and thereby relieves the valve-stem 1 of the pressure upon it. The spring s then raises the valve-stem i', closing thereby the valve-seat valve t, and the spring s closes the main valve V around the ports P-steam in the valve V leaking out, as above eXplained-- and shuts off the passage of steam through the valve'seat, the main valve Vrernaining closed so long as the pressure of steam-back-presst valve 'v2 is seated over` the opening h 2 in the` valve-seat prolongation of the apparatus shown in Fig. 2,instead of, asin Fig. l, passing through the opening M of that gurc.

The operation is as follows: Theconipress ing-nut N2 is turned against the spring S2, and the spring compressed sufficiently thereby to resist apressure not greater than the maximum pressure intended. The spring S2, by means of the disk Q2, bears through the diaphragm D2 upon the valve-stem r2, and forces said valve-stem down against the lifting force of the spring s2, seating the valve-seat valve` o2 over the opening M2 ofthe prolongation G2 of the valveseat, and keeping said opening closed.

Steam enters through the inlet A2, and passf ing through the perforationsf2 in the valve-` case cap K2presses against the diaphragm D2; The steam,pressing against the diaphragm D?, when it exerts the maximum `pressure intended and tends to rise above it,t`orces up the disk Q2 and thesprin g S2, andtherehy relieves thevalvestem r2 of the pressure upon itl. The spring s2 then `raises the valve-stem r2 and lifts the valve-seat va1vev2 from its seat over the opening M2. Steam then passes through this opening M2 and presses against the inner area, L2, of the main Valve V, and lifts this valveV2 against the pressure of the `valve-closing spring s3, opening thereby the ports P2 of the valveseat prolongation,` through which steam escapes to the outlet B2 until the pressureof steam upon the diaphragm D2 is less than the maximum pressure intended, when the spring S2, by means of the disk Q2, bears through the diaphragm D2 upon the valve-stem r2, and

forces said valve-stem down and seats the valve-seat valve t2 over the opening M2, elosing said opening and shutting off the passage of i steam to the inner area, L2, ofthe main valve V2. The valve-closing spring s3 then closes the 'valve V2 around the ports P2, shutting off the escape of steam to the outlet B2, the l small. opening x inthe main valve V2 admitting ofla slight leakage of steam to avoid forming temporarily a cushion when the valve Vz closes.

I claim- In a valve apparatus, the combination of a main valve, main valve-closing spring, valveseathaving a prolongation provided with a. port or ports, and a valve-seat valve operatedT substantially as set forth, substantially as descrihed, for the purpose specified.

GEORGE T. NVILSON.

\Vitnesses:

VVALDRON BATES, JULIAN DEsT.

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