US445041A

US445041A - Cornelius callahan

Info

Publication number: US445041A
Authority: US
Publication date: 1891-01-20
Anticipated expiration: 1908-01-20

Description

(No Model.) 2 Sheets-Sheet 1 O. GALLAHAN.

RELIEF VALVE.

No. 445,041. Patented Jan. 20, 1891.

(No Modell) 2 Sheets-Sheet 2.

O. OALLAHAN.

RELIEF VALVE.

No. 445,041. Patented Jan. 20,1891.

STATES PATENT OFFICE.

CORNELIUS CALLAHAN, OF BOSTON, MASSACIIUSETS, ASSIGNOR TO THE CORNELIUS CALLAHAN COMPANY, OF SAME PLACE.

RELIEF-VALVE.

SPECTFICATION forming part of Letters Patent No. 445,041, dated January 20, 1891.

Application filed October 9, 1890.

T0 ctZZ whom it may concern:

Be it known that I, CORNELIUS UALLAHAN, of Boston,in the county of Sulfolk and State of Massachusetts, have invented certain new and useful Improvements in Relief-Valves for Gravity or Increased \Vaterlrcssu re, of which the following is a specification.

My invention relates to relief-valves for gravity or increased water pressurethat is, to devices contrived to relieve the apparatus and hose of the back action of the water or pressure of the water above a predetermined degree.

It is the object of the invention to provide a relief-valve which shall be simple in construction, certain in its operation, and thoroughly efficient for the purposes for which it is intended.

The invention consists of the improvements in relief-Valves which I will now proceed to describe and claim, reference being had to the annexed drawings, and to the letters of reference marked thereon, forming a part of this specification, the same letters designating the same parts or features, as the case may be, wherever they occur.

Of the aforesaid drawings, Figure 1 is a perspective view of a relief-valve casing equipped with my improvements. Fig. 2 is a vertical central sectional view thereof. Fig. 3 is a transverse vertical sectional view.

In the drawings, a designates a valve-casin g adapted to be attached to a pump or hydrant, and constructed, as at b, so as that a hose may be coupled thereto, 0 designating an exit-port, through which the water maybe led to a section of hose and conveyed back to the pump or be discharged upon the ground.

(Z designates a valve secured to the lower end of the valve-stem e, and held normally on its seat f to close the port 0 by means of a spring g, operating at its upper end against the lower face of the valve 72, secured to the upper end of the Valve-stem and at its lower endon the bottom of the valve-chamber i.

jj designate ports leading from the chamher it of the valve-casin g to the valve-chamber i, so that water may he admitted to said chamber iaud operate against the valve h, the face of which is of greater area than the face of valve d, so as to overbalance the latter and Serial No. 367,521. (No model.)

insure the retention of the valved against its seatf, and thus keep the outlet-port 0 closed.

Z designates a chamber formed in a projecting part on of the valve-casing a, in which chamber is arranged a valven, adapted to be pressed against its seat 0 by means of a spring 19, which operates against the rear face or end of the valve 71.

r designates a port leading from the valvechamber 1 down to a pointbelow the valved, so that if the valve 17. should be drawn back from its seat 0, as represented in Fig. 2, the

waterin the chamber 1' might flow through the port 0* and be discharged through the port 0.

The annular enlargement m on the valvecasing is screw-threaded on its exterior, as represented at s, and a screw-cap t, constructed so that it may be turned upon the enlargementor stem or, and thus regulate the degree of tension with which spring 1) may bear against valve n to hold the same upon its seat 0.

a is a set-nut screwed upon the annular stein m, and adapted to be turned up against the inner end of the screwcap s after the latter has been so adjusted as to cause the spring 17 to bear with the requisite stress upon the valve 11, as before explained.

The operation of my improvement is as follows: Supposing that it is desired that the pressure of the water upon the hose or apparatus should not exceed one hundred poundsto the square inch, the screw-cap 6 will be turned up against the springp to an extent that a fraction of pressure above one hundred pounds to the square inch would overcome the stress or tension of the spring and force the valve it back from its seat. With this adjustment of the parts the valves (1 and 7t will assume the positions in which they are represented in Fig. 3, water passing up into the chamber 1' and operating against the face of the valve h with greater force than it operates against the face of the valve (Z. Should the apparatus be in operation and the Water shut off from the nozzle of the hose or from any other reason the pressure of the water should tend to exceed one hundred pounds to the square inch, this undue force operating against the valve 92 will force the same back from its seat against the stress of spring p, opening the port 1", and releasing the water in the cham her 6, as shown in Fig. 2,so thatinstantly the .pressure of the water upon valve (Z will become much greater than upon the vali e Zz. As a consequence, the latter valve will be forced down from its seat, as represented in Fig. 2, opening the port 0 and allowing the water to How or be forced out therethrough. The instant the pressure of Water in the apparatus falls below one hundred pounds to the square inch the spring 19 will operate to force valve at back upon its seat 0, and the pressure of water in chamber 11, operating against valve h, will raise the same and with it valve (Z,- and so close the port 0, as represented in Fig. 25.

The ready manner in which the spring 2) maybe adjusted so as to bear with greater or less force upon the valve n is an important feature of the invention.

The valve (Z is supported somewhat loosely on the lower end of the valve-stem e, and the hole formed through the said valve is packed by a headed screw 'v, tapped into the lower end of the valve and clamping a washer w between. the head of the screw and the-sur- 1. A relief-valve for gravity and increased water pressure, consisting of the valve-casing provided with an outlet-port c and valvechamber 2', a valve h in said chamber, ports j j, leading from the casing-chamber to the valve-chamhert',a valve (Z- to close the outletport 0, avalve-stem connecting the two valves (Z 71, the face of the valve h being of greater area than the face of the valve (Z, the valvechamber Z, the spring-pressed valve 12 to close the port leading from the valve-chamber i to the valvechamber Z, and a port or passage 1, communicating between the valve-chamberl and the outlet-port c, as set forth.

2. A relief-valve for gravity and increased water pressure, consisting of the casing a, provided with the outlet-port c and valvechamber 2', a valve h in said valve-chamber, portsjj, leading from the interior of the easing to the valve-chamber '2 a valve to close the outlet-port, a valve-stem connecting the two valves (Z and h,the face of the latter valve being of greater area than the face of valve (Z. the valve-chamber Z, the valve n to close the port leading from the valve-chamber t to the valvechamber Z, a spring to press the valve n upon its seat, a screw-cap for ad j usting the tension with which the said spring may bear upon the valve 1t, and a port 4", leading from the chamber Z to the outlet-port c, as set forth.

In testimony whereof I have signed'my name to this specification, in the presence of two subscribing witnesses, this 30th day of September, A. D. 1890.

CORNELIUS CALLAHAN.

Witnesses ARTHUR WV. ORossLnY, A. D. HARRISON.