US609726A - Valve - Google Patents

Description

Patented Aug. 23, I898. P. DE 0. BALL.

VALVE.

(No Model.)

UNITED STATES 1 PATENT OFFICE.

rniLir DE 0. BALL, on ST. LOUIS ,MISSOURI.

'VAL'VE. I

SPECIFICATION forming part of Letters Patent No. 609,726, dated August 23, 1898.

' Application filed September 27 1897- Serial No.'653,155. (No model.) i

To all whom it may concern:

Be it known that I, PHILIP DE 0. BALL, a

citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvenient in Valves, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, forming part of this specification, in

which- Figure l is a'vertical sectional view through my improved valve. Fig. 2 is a horizontal sectional view on line 2 2, Fig. 1; and Fig. 3 is a slightly-modified form.

,This inventionrelates to new and useful improvement in valves designed especially for use in the-discharge-pipes of gas-pumps in refrigerating plants, thevobject being to make a quick-acting and noiseless self-closing valve which will accommodate itself to varying pressures in the pump-cylinderand in the discharge-pipe without 'requirin g frequent adjustment or constant attention.

In the drawings, A indicates the valve-casing, formed or provided with a valve-seat a near its lower enda'nd just'above the point where it enters the pump-cylinder.'

B is a coupling extending into the valvecasin'g, to which. the discharge-pipe is secure r 0 indicates a head, secured by suitable means to the upper end of the valve-casing A,

saidhead being formed or provided with a.

, plunger D, extending into the valve-casing,

as shown. This plunger Dis provided with a duet (Z, which is controlled by a needlevalve E. This needle-valve may be threaded or otherwise arranged in-the head 0, so as to render its adjustment easy.

F indicates the valve, seated on thevalveseat a. The stem of this valve is made hollow and receives plunger D, which is closefitting therein, so as to form a chamber under 'said-plungerD.

Gr indicates a spring interposed between'tlie plunger D and the valve F. This spring, however, is not necessary and is only used to normally keep the valve to its seat when the pump is starting to run.

The operation of the valve is as follows:

Gas-pumps 'for forcing vapors through systems in refrigerating plants usually make from sixty to one hundred and sixty strokes a minute, the -pressure of the vapors compressed by the plunger of the pump-cylinder being about two hundred pounds per square inch. Ordinarily valves are arranged in the discharge-pipes of said pumps and have a spring surrounding their stem, said spring acting to keep the valve to its seat to prevent the pressure from the discharge-pipe from coming back into the cylinder. It is well known that when the pump-piston is approaching the end of its stroke the pressure of the gases in front of it exceeds that of the dischargewpipe, and under such conditions the valve w llzhe raised to permit said gases to pass into the discharge-pipe. \Vhen the pump-piston passes the end of its stroke and returns, the pressure is taken from beneath the under side of the valve, and when a spring such as described is used the valve will re turn to its seat with a quick movement, mak ing considerable sound and tending to wear the valve and its seat irregularly, and thus prevent the proper seating of. the valve.

By the construction of my valve the pressure in the discharge-pipe is constantly flowing through the duct cl to the chamber beneath the plunger D, and this pressure is depended upon to keep the valve to its seat.

The needle-valve is so adjusted that this pressure can escape back through the duct d to the discharge-pipe whenever the valve is to be raised to permit the passage of. gas from the pump-cylinder. Under such conditions the valve will be raised, and when the piston starts on its return stroke instead of the valve hammering or striking the valve-scat with a sudden blow it will descend to apoint where the pressures on eaehside are practically equalized, when the spring. G will commence to act until such time as the pressure'in the pump-cylinder is less thanthat "in the discharge-pipe, when the valve will be seated by the pressure in the discharge-pipe,

making atight seat.

When the pump is working rapidly-say about one hundred andsixty strokes a min ute==the needle=valve is adjusted so as to open the duct cl toa considerable extent to permit free passage of the pressure into and out of the chamber beneath the plunger D. \Vhen the pump is running slowly-say about sixtystrokes a minute-the needle-valve is adjusted so as to almost close the duct d.

In Fig. 3 I have shown a slight modification in which the plunger is arrangedon the valve and the openended' cylinder on' the head of the valve casing. The operationis the same as that ofv the construction, shown in Fig. 1.' i

I am aware that many minor changes in the construction, arrangement, and combination of the several parts of myvalve can be madeand substituted for those herein shown and described without in the least de'-' parting from the nature and principle of my invention. j

Having thus described my invention, what I claim is- 1.-In a valve for controlling discharge-- pipes in pumps the combination of a casing provided with a valve-seat, a valve provided ith a stern, a guide for said stem and form-- ing therewith a chamber, a valve for control ling a passageplacing said chamber and casing in communication, and a spring arranged 'insaidchamber acting to hold "the valve toits seat.

2 .In a valve for controlling discharge pipes in pumps, the combination of an open-- ended casing with a valve-seat opposite the open end, a cap for said open end provided with a plunger extending toward but terminating a distance" from said-valve seati and provided with an open passage leadingto the end of the plunger, 'a valve controlling said passage, a valve having a hollow stem slidingly engaging said" plunger, and forming therewith a chamber between the end of the plunger and thevalve, and a spring in-said chamberwseated against the plunger and valve. A v n In testimony whereof I hereunto afl x'my signature, in the presence of two witnesses this 9th day of September, 1897;

PHILIP DE 0. BALL. \V itnesses:

HUGH K. WAGNER, F. R. CORNVV-ALL.

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