US1648499A - Pressure valve - Google Patents

Description

Nov. 8, 192 7.

P. A. MYERS PRESSURE VALVE 2 Sheets-Sheet l Filed June 21, 1926 www - INVENTOR. PHIL/P 1'4. MYERS, BY

A TTORNEYS.

Nov. 8, 1927.

P. A. MYERS PRESSURE VALVE 2 Sheets-Sheet 2 if M Filed June 21, 1926 INVENTOR. PHIL/P A. MYERS, BY

ATTORNEYS.

Patented Nov. 8, 1927.

UNITED STATES 1,648,499 PATENT OFFICE.

PHILIP A. MYERS, 0F ASHLAND, OHIO, ASSIGNOR TO THE F. E. MYERS 8t BRO. COM- .PANY, 0F ASHLAND, OHIO, A CORPORATION OF OHIO.

PRESSURE VALVE.

Application filed June 21, 1926. Serial No. 117,801.

This invention relates to pressure valves for use with power spray pumps and spray tanks.

The general object of the invention is to provide an eflicient and highly practical pressure or relief valve which Wlll automatically open when the desired maximum pressure of the spray liquid dellvered lnto the valve by a power pump fed 0r supplied by the spray-mixture tank, usually mounted on a chassis to make it portable, to permit the excess of liquid to pass out of the valve and return to the tank.

To this end my improved pressure valve consists, essentially, of a casing divided into a receiving chamber and a pressure chamber, with a valve between them which will seat when the pressure becomes excessive in the pressure chamber, or a diaphragm operated by this excess of pressure to actuate a yoke, and of a relief valve in the receivlng chamber actuated by such yoke to allow the excess of fluid which is creating the excess of pressure to escape from the valve casing and return to the fluid tank from which it came on entering the pump.

Such is the general organization of my improved relief valve, the particularities of which will appear hereinafter.

In the accompanying drawings,

Figure 1 is a vertical sectional View taken through the valve in its entirety.

Figure 2 is a transverse vertical sectional view taken on the line 2 2 of Figure 1.

Letit be supposed that a tank or vessel containing the spray liquid is associated with this valve, and that a power pump intervenes between the tank and this valve and is connected with the valve through a pipe indicated at 1.

When the pump is operated as by an associated gasoline engine, it will pump the spray liquid from the tank through the pipe 1 into the valve casing indicated generally at 2. This casing, usually made of cast brass, comprises an interior receiving chamber 3 and a pressure chamber 4; separated by an integral partition 5 and a pressure-retaining valve 6. This valve is seated in a cage 7 mounted on the partition 5. When the liquid fills the chamber 3, it then lifts the valve 6 and fills the chamber 4 which normally remains filled as the excess of the liquid or the oncoming supply discharges through theport 8 and goes thence into a hose by which it is directed upon the trees or other plants which are to be sprayed.

But there are times when the user desires to close his nozzle and cutoff the supply of the spray fluid. With this pressure valve he may do so with freedom. l/Vhen he closes his nozzle, the pressure instantly rises in the pressure chamber. and actuates the diaphragm and piston plunger which through the yoke will unseat the discharge valve and allow the liquid to flow to the by-pass and thence back into the tank. Thus the liquid will flow from the tank to .the pump, from the pump to the valve, and from the valve into the tank at times when the nozzle is closed, and there being no resistance at that time the engine may be throttled down to run slowly if that be desired, the engine being relieved of the load. Usually the valve will be set for normal pressure at, say 300 to 400 pounds to the square inch in the pressure chamber 4. Any excess of pressure will operate in the manner now to be described. a.

The relief mechanism consists of a pressure diaphragm indicated at 9 and extending across the upper part of the pressure chamber 4. This diaphragm is secured in place by the extension of the casing indicated at 10 in the nature of a cylindrical cap. Then in the bore 11 of this cylindrical cap is slidingly mounted a plunger designated 12. This plunger rests upon and reenforces the diaphragm, the diaphragm acting to prevent any leakage of the liquid from the chamber 4 into the bore 11, but yielding to the pressure and thereby actuating the plunger 12,

that is to say, yielding when the pressure is in excess of that for which the valve is set, say 300 or 400 pounds.

The upper portion of the plunger 12 travels in the adjoining part of the extension 10 and carries a spring 13 positioned around the stem 14 of the plunger, which stem is guided in a part of the tension nut 15 screwed upon the extension 10. The up- .per end of the spring 13 bears against the tension nut and the tension of the spring is regulated by adjusting this nut up or down in its threaded connection with the extension 10.

Thus itwill be understood that any pressure in excess of that for which the plunger with its diaphragm has been set will act to lift thediaphragm and plunger against the liquids.

pressure" of the spring. The plunger is equipped with a cross pin 16 as more clear- 1y shown in Figure 2, and the extension 10 is slotted as seen at 17 to permit the cross pin to travel up and down with the movements of the plunger 12-upward when Vielding to excessive pressure and downward y the action of the spring 13 when the excess of pressure has been lifted.

The cross pin 16 carries a yoke 18 which extends down and carries at its lower end an adjustable valve lifter 19 in the nature of a rod screwed through the yoke and having a head 20 to receive a wrench so that the lifter may be positioned as required in the proper assembling of the parts. A look nut 21 insures holding the lifter 19 in any adjust d position. This lifter passes through a stu ing box generally indicated at 22, consisting of a gland and suitable packing carried by the lower portion 23 of the general valve casing. This part of the casing is formed of a separate shell suitably connected with the general valve shell and carrying a valve cage 24 affording a seat and guide for an unloading valve 25 preferably of spherical form.

It will now be seen that when the excess of pressure lifts the diaphragm and plunger 12, which in turn lifts the yoke 18 of the valve lifter 19, the valve 25 will be elevated from its seat by the lifter, and that, therefore, a part of the incoming spraying liquid entering through the pipe 1 into the receiving chamber 3 will be allowed to escape through the passage 26 in the cage 24: and thence through the chamber 27 in the shell 23 and to the by-pass pipe 28 which leads back to the tank containing the supply of This escape of liquid from the chamber 3 relieves the excess pressure in the chamber 4 because the quantity of liquid that created the excess of pressure in the chamber 4 is thereby reduced, 'so that substantially as much liquid will flow out of the disfiharge port 8 as currently enters the cham- To form a stop to limit the movement of the unloading valve 25 .a projection 29 is formed on the cap 30. This cap is made removable in order to give access to the interior of the receiving chamber 3 for occasionally cleansing the unloading valve 25 and its seat in the cage 24:. The cap 30 is held in place by a clamp consisting of a bar 31 suit-' ably connected at its ends 32 with the valve casing and carrying a binding screw 33.

To supply lubricant to the lifter 19 a grease cup '34 is mounted on the shell 23 as seen in Figure 1.

While I have referred to the use of this pressure valve with power spray pumps and spraytanks, it is to be understood that it is applicable to many other uses and that other uses are contemplated by me.

It will be understood that I desire to'comprehend within my invention such modifications as may be necessary to adapt it to varying conditions and uses.

Having thus fully described my invention, what I claim as new. and desire to sesure by Letters Patent, is:

1. In a pressure valve, the combination with a casing divided into a receiving chamber and a pressure chamber, a port in the partition between the chambers, a downward seating valve in said port, an outlet port for the pressure chamber, an outlet port for the receiving chamber, a valve for the latter and an inlet for the receiving chamber, of 8.. diaphragm .and plunger extending across one end of the pressure chamber, an extension on the casing forming an enclosure and guide for the plunger, a spring acting on the plunger and a tension nut screwed on the extension and contacting with the spring, a transverse pin carried by the plunger, a yoke connected to said pin and extending thence down the sides of the casing, a lifter connected to the lower end of the casing and adapted to unseat the outlet valve of the receiving chamber when the diaphragm and plunger are actuated by excess pressure, and a means for limiting the movement of the outlet valve.

2. In a pressure valve, the combination with a casing, a receiving chamber therein, an inlet pipe therefor adapted to extend to a pump, and an outlet by-pass pipe adapted to extend to a spray liquid tank, a pressure chamber within the casing, a port in the partition between said chamber, a valve for said port and an outlet for each chamber, of a diaphragm and plunger extending across the end of' the pressure chamber, a spring acting-on the piston to resist normal pressures in the pressure chamber and to permit the diaphragm and plunger to yield to excess pressures therein, a valve for the outlet port of the receiving chamber, a yoke connected to the plunger and a lifter actuated by the yoke to unseat said outlet valve, whereby an excess of pressure in the pressurechamber will .cause the outlet valve to be unseated and giv-e relief by the outflow of liquid from the receiving chamber, and a removable cap fitting into the casing of the receiving chamber adjacent the outlet valve, the cap being provided with a projection for limiting the movement of the said outlet valve. I

In testimony whereof, I aflix my signature.

PHILIP A. MYERS.

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