US1196926A

US1196926A - Relief-valve.

Info

Publication number: US1196926A
Authority: US
Inventors: Alvan B Brown
Original assignee: CHARLES H FIELD
Current assignee: CHARLES H FIELD
Priority date: 1914-08-24
Filing date: 1914-08-24
Publication date: 1916-09-05
Anticipated expiration: 1933-09-05

Description

wkn/moon A. B. BROWN` RELIEF VALVE'.

APPLICATION FILED AUG-24| 1914.

Patented Sept. 5, 1916.".

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Snom/vte@ Il TFL T ALVAN B. BROWN, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR 0F ONE-HALF TO CHARLES H. FIELD, OF GRAND RAPIDS, MICHIGAN.

RELIEF-VALVE.

Application filed August 24., 1914. Serial No. 858,165.

To all whom t 'may concern Be it known that I, ALvAN B. BROWN, a citizen of the United States, residing at Grand Rapids, Michigan, have invented certain new and useful Improvements in Relief-Valves, of which the following is a specification.

This invention relates to improvements in relief valves and particularly to improvements in relief valves for spraying purposes.

It has been quite a common experience in the operation of relief valves for pressure pumps of sprayingapparatus to have these become inoperative on account of clogging and the corrosive nature of the spraying solution.

One of the objects of this invention is to eliminate this objection.

The main objects of this invention are: First, to provide an improved relief valve of the plunger type in which the spraying solution cannot get back of the plunger and in which the barrel of the cylinder has a smooth wall without projections or ledges upon which grit or sediment might lodge to prevent the valve from closing. Second, to provide in a relief valve, an improved type of plunger, having a non-corrodible pressure ring and an improved lubricating sleeve which effectively lubricates the path of the plunger and prevents the spraying solution getting back of it. Third, to provide an improved relief valve of the plunger type in which the plunger operates merely to control the opening to the by-pass and in which the movement of the plunger is limited by stop means outside of the valve casing. Fourth, to provide an improved relief valve in which the spring is easily accessible and is located on the outside of the valve casing and in which the spring 1s easily adjustable and may be readily changed to substitute a stronger or weaker spring. Fifth, to provide an improved relief valve which is very simple in construction, in which the minimum number of parts are used and in which the parts are easily accessible and can be readily removed. Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specication. The invention is clearly defined and pointed out in the claims,

Speccaton of Letters Patent.

Patented sept. 5, raie.

A structure which is a preferred embodiment of my invention is clearly illustrated 1n the accompanying drawing forming a part of this specification, lin which:

Figure I is a side elevation of a structure embodying the features of my invention. Fig. II is a detail View partially in longitudinal section on a line corresponding to line 2-2 of Fig. I. Fig. IIIfis a detail view of the valve plunger partially in longitudinal section on a lineV corresponding to line 3-8 of Fig. II. Fig. IV is a detail vlew of a modified form of plunger partially in vertical section.

In the drawing, similarv reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

In spray pump structures relief valves are provided with by-pass connections leading back to the source of supply, so that'in the event of the stoppage of the nozzle or the development of a higher pressure than the nozzle is intended to work under, the surplus will be returned by the by-pass to the source of supply. c

Considering the numbered parts of the drawing, the valve casing l is cylindrical in form and is provided with a by-pass 2 at one side and an inlet 8 at the bottom. The by-pass 2 connects with the cylinderv `l through the slot 20 which is considerably narrower than the diameter of the cylinder. TheV casing has the cap 4L threaded on the upper end thereof and having a bearing for the plunger rod 6. Plunger rod 6 is shouldered at 8, near its lower end, and the pressure ring 7 is disposed on the lower end of said plunger rod and abuts against the shoulder 8. This pressure ring mayy be made of any metal which is non-corrodible and is not a'ected bythe action of such solutions as are commonly used for spraying purposes. The nut r ,9, threaded on the end of the plunger rod 6, clamps the pressure ring `2' against the shoulder 8. `A lock nut 9 is also provided.

` On the portion 5 of the plunger rod above the shoulder 8, I provide a lead ring or sleeve 10 in` which a plurality of holes 10 are drilled. These holes are spirally disposed, as shown in the drawing, and are packed full of hard grease. The sleeve 10 is slightly smaller in diameter than the pres- Above the sleeve 10 is provided the expansible packing ring 11 and above this packing ring is disposed the washer 12 against which the shoulder 14k of the plunger rod 6 abuts so as to clamp said washer against the said packing ring 11. The nut 13 engages the washer 12 to hold it in place. The lock nut 13 is also provided. By tightening the nut 13, the ring 11 may be expanded as desired.

The pressure spring 15 is of the coil type, the outer end coil being formed into an eye 16 embracing a stud 17 on the upper end of the plunger rod 6. The spring is connected to the casing by engaging its lower end coils with the lugs 18 disposed on the casing. The tension of the spring is regulated by turning the spring on these lugs to lengthen or shorten the eective part of the spring, as will be readily understood by an inspection of the drawings.

Vashers

21, 21 are disposed on the plunger rod 6, resting on the top of the cap 4 and a stop pin 19 carried by the plunger rod G engages these washers to limit the downward movement of the plunger. rlhe pres- Sure ring 7 in its normal position is disposed just below the lower edge of the by-pass so that a very slight movement will open the by-pass to relieve Ythe pressure. In case the pressure ring 7 becomes wo-rn and does not close the by-pass fully when in its normal position, washers 21 may be removed so as to allow the plunger to move farther down in the cylinder.

In Fig. IV, I have shown a vertical sectional view through a modified construction of plunger.` In the modification I arrange on the portion 5 of the plunger rod above the shoulder 8 above the presure ring 7 a plurality 0f oil soaked packing rings 22, and above these oil soaked packing rings an ex pansible packing ring 11. These packing rings are slightly smaller in diameter than the pressure ring so as to move easily within the cylinder. r1`he packing ring 11 is clamped in place by the washer 12 and the

nuts

13 and 13 as in the preferred construction of my plunger. t

Spaceoccupied by the sleeve 10 in the preferred form of the packing rings 22 in the modification is such that the expansible packing ring 11 is always above the by-pass,

that is, it does not travel across the by-pass as the by-pass opens and closes.

The pressure ring 7 fits tightly within the cylinder to prevent the mixture passing between said pressure ring and the wall of the cylinder. The sleeve 10 is slightly smaller in diameter than the pressure ring 7 as I are packed with grease, this sleeve prevents the spraying mixture from passing above the plunger.

rIhe opening tothe by-pass is a narrow slot 2O in lthe wall of the cylinder so that the maximum amount of bearing surface for the plunger is provided. The expansible packing` ring 11 effectively prevents any of the solution getting above the plunger and, as this packing ring reciprocates in a portion of the cylinder having an unbroken surface, the wear thereon is minimized.

The movement of the plunger under the infiuence of the spring 15 is limited by the engagement of the stop pin 19 with the top of the cap a or with the washers 21. This is outside of the valve casing and eliminates the necessity for any valve seats with which the end of the plunger engages to limit the movement thereof. When the plunger engages the valve seat, it is open to serious objection because of the fact that grit or sediment might lodge on the valve seat and hold the valve open.

Inasmuch as it is impossible for the spraying mixture to pass above the plunger, it is unnecessary to provide a packing gland at the end of the cylinder for the plunger rod. The cap l can be readily unscrewed to give access to the parts so that the plunger can be easily removed to lubricate the same.

It will be apparent that I have produced a very simple structure consisting of few parts, all of which are easily accessible and that I have produced a structure which is easily lubricated and in which the surface exposed to the corrosive action of the spray ing mixture is reduced to the minimum.

Although I have shown and described my relief valve in connection with a spraying apparatus, it will be apparent that it is adapted for use with pressure pumps of any description.

I am aware that the particular form of my invention which I have here described is susceptible of considerable variations without departing from the spirit of my invention and, therefore, I do not wish to be restricted to the same. I have found, however, that this form is to be preferred and therefore, I desire to claim the same specifically as well as broadly as indicated by my appended claims.

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

1. In a relief valve, the combination of a cylindrical casing having an inlet at one end thereof. and a by-pass at one side, said bypass communicating with .said casing through a narrow slot formed in the side 13o wall of said casing, a cap closing one end of said cylindrical casing, a plunger rod having a bearing in said cap and provided with a shoulder adjacent one end thereof, a pressure ring of non-corrodible metal disposed on said plunger rod and clamped against said shoulder, a lead sleeve disposed on said plunger rod above said pressure ring and provided with a plurality of spirally disposed holes therein, said holes being packed with grease, said sleeve being slightly smaller in diameter than said pressure ring, a packing ring of eXpansible material disposed upon said plunger rod above the said sleeve, adjustable means for clamping said expansible ring in place to expand it as desired, a stop pin carried by said plunger rod and adapted to engage said cap, to limit the movement of said plunger, a coiled spring surrounding the end of said plunger rod and said cap, with the end thereof engaging the end of said plunger rod and a lug on said cap adapted to engage the other end of said coil whereby said plunger is normally forced toward the inlet in said casing, all coacting substantially as described for the purpose specified.

2. In a relief valve, the combination of a cylindrical casing having an inlet at one end thereof and a by-pass at one side, said bypass communicating with said casing through a narrow slot formed in thev side wall of said casing, a cap closing one end of said cylindrical casing, a plunger rod having a bearing in said cap and provided with a shoulder adjacent one end thereof, a pressure ring of non-corrodible metal disposed on said plunger rod and clamped against said shoulder, a lead sleeve disposed on said plunger rod above said pressure ring and provided with a plurality ofspirally disposed holes therein, said holes' being packed with grease, said sleeve being slightly smaller in diameter than said pressure ring, a packing ring of expansible material disposed upon said plunger rod above the said sleeve, a stop pin carried by said plunger rod and adapted to engage said cap, to limit the movement of said plunger, a coiled spring surrounding the end of said plunger rod and said cap, with the end thereof engaging the end of said plunger rod and a lug on said cap adapted to engage the other end of said coil whereby said plunger is normally forced toward the inlet in said casing, all coacting substantially as described for the purpose specified.

3. In a relief valve, the combination of 'a cylindrical casing having an inlet at one end thereof and a by-pass at one side, said bypass communicating with said casing through a narrow slot formed in the side wall of said casing, a cap closing one end of said cylindrical casing, a plunger rod having a bearing in said cap and provided with a shoulder adjacent one end thereof, a pressure ring of non-corrodible metal disposed on said plunger rod and clamped against said shoulder, a lead sleeve disposed on said plunger rod above said pressure ring and provided with a plurality of spirally disposed holes therein, said holes being packed with' grease, a packing ring of eXpansible material disposed upon said plunger rod above the said sleeve, a stop pin carried by said plunger rod and adapted to engage said cap, to limit the movement of said plunger, a coiled spring surrounding the end of said plunger rod and said cap, with the end thereof engaging the end of said plunger rod and a lug on said cap adapted to engage the other end of said coil whereby said plunger is norm-ally forced toward the inlet in said casing, all coacting substantially as described for the purpose specified.

4. In a relief valve, the combination of a cylindrical casing having an inlet at one end thereof and a by-pass at one side, said .by-pass communicating with said casing through a narrow slot formed in the side wall of said casing, a cap closing one end of said cylindrical casing, a plunger rod having a bearing in said cap, a pressure ring of noncorrodible metal disposed on said plunger rod, a sleeve disposed on said plunger rod above said pressure ring, and provided with a plurality of holes packed with grease, a packing ring of eXpansible material disposed upon said plunger rod above said sleeve, a stop pin carried by said plunger rod and adapted to engage said cap, to limit the movement of said plunger, a coiled spring surrounding the end of said plunger rod and said cap, with the end thereof engaging the end of said plunger rod and a lug on said cap adapted to engage the other end of coil whereby said plunger is normally forced toward the inlet in said casing, all coacting substantially as described for the purpose speciied.

5. In a relief valve, the combination of a cylindrical casing having an inlet at one end thereof and a by-pass at one side, a cap closing one end of said cylindrical casing, a plunger rod having a bearing in said cap, a pressure ring of non-corrodible metal disposed on said plunger rod, a lubricating sleeve disposed on said plunger rod above said pressure ring, a packing ring of expansible material disposed upon said plunger rod above the said sleeve, a stop pin carried by said plunger rod and adapted to engage said cap, to limit the movement of said plunger, a coiled spring surrounding the end of said plunger rod and said Cap, with the end thereof engaging the end of said plunger rod and a lug on said cap adapted to engage the other end of said coil whereby said plunger is normally forced toward said inlet in said casing, all coacting substantially as described for the purpose specified.

6. In a relief valve, the combination of a piston valve with a suitable casing, a stem for the said valve, a cap for the casing containing a bearing through which said valve stem is disposed, and provided with outwardly projecting lugs, a stop on the valve stem to limit its inward movement, and a coiled spring formed to engage the end of the valve stem anol adapted to engage by screw action the lugs on the valve cap for adjusting the tension thereof, coacting` for the purpose specified.

7. In a relief valve, the combination of a piston valve with a suitable casing, a stem for the said valve, a cap for the casing through which said valve stem is disposed, and provided with outwardly projecting lugs, a stop on the valve stem to limit its inward movement, and a coiled spring formed to engage the end of the valve stem and adapted to engage by screw action the lugs on the valve cap for adjusting the tension thereof, coacting for the purpose specified.

8. In a relief valve, the combination of a valve casing with a by-pass opening at the side, a piston valve disposed therein comprising a pressure ring of non-corrodible metal, fitting a shoulder on the said valve at its inner end, a sleeve of metal above said pressure ring` provided with lubricant pockets, an expansible packing ring above said lubricant sleeve, screw-threaded members for compressing` the same, and pressure means for holding` said valve in closed position, as specified.

ln witness whereof, l have hereunto set my hand and seal in the presence of two witnesses.

JACOB STEKETEE, BETH LONG.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patente, Washington, D. C.