US1554673A - Valve - Google Patents

Description

Patented Sept. 22, 1925.

UNITED `sra'lras FREDERICK HEATH, OF SOUTH BELLINGHAM, VASHINGTON.

' VALVE.

Application led March 22, 1924.

To all 'whom t may concern.'

Be it known that I, FREDERICK HEATH, a citizen of the United States, and resident of South Bellingham, in the county Oi "Whatcom and State of lVashington, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to valves which automatically close to cut oill the flow of fluid when an abnormal condition arises in the system in which the valve is installed, and is designed particularly to control the flow of oil to burners. The invention has for its object the production of a novel valve which will close automatically upon a reduction of the pressure at the delivery side of the valve and will remain closed until manually opened after working conditions are restored. Other objects of the invention are to provide means for locking the valve 'in open position, means for venting the valve, novel means for adjusting` the valve, and means for locking the adjusting means in a set position. All these objects are attained in such a device as is illustrated in the accompanying drawing and hereinafter described and claimed. l

The drawing is a sectional view partly in elevation of a device embodying` my present improvements.

The valve comprises a body or casing 1 having an inlet port 2 in' one side which, in

practice, is connected with a pump whereby the oil is delivered under pressure, and having an outlet port 3 in its opposite side which is connected with the pipe leading to the burners. A web or partition l .is protop thereof.

vided within the body or casing and rises 'from the lower wall of the outlet port at the inner end thereof to meet a web 5 extending from the inner end of the inlet port at the A port 6 is formed in the web 5 and a tortuous passage for the oil is thus provided through the casing. The valve body 1 is so formed as to provide a pressure chamber 7 below and at the inner end ot the inlet port, and a barrel or valve guide and support 8 is formed within this chamberin axial alinement with the port 6 and in spaced relation to that wall of the casing which depends from the inner end ofthe inlet port. A piston valve 9 ,is slidably mount- Serial No. 701,146.

ed in the barrel 8, the ends of the barrel belng open and spaced trom the port 6 and the bott-om of the chamber 7 respectively so that both ends of the valve are exposed to the pressure of the oil in the casing. The piston is iitted with piston rings 10 to resist leakage and the lower end of the piston is somewhat larger than its upper end so that, owing to its greater area, the pressure thereon willoverbalance the pressure on its upper end and, consequently, there will be a constant tendency of the piston valve to seat and close the port 6.` The barrel 8 is, of course, of a differential form corresponding to the -form of thepiston, a shoulder 11 on the barrel being opposed to a shoulder 12 on the piston and preventing` the piston jamming against its seat at the port 6.

It will be understood, of course, that the oil entering the valve casing ills the chamber 7 and, by its pressure on the larger lower end of the piston, lifts the piston to its seat at the port 6. To unseat the piston, there is provided a plunger or push-rod 13 which is slidably mounted through the cap 14, secured upon and closing the upper end of the casing, andis adapted to extend through the port 6 and bear upon the upper end of the piston.L This rod 13 is pivoted at its upper end to a hand lever 15 and is provided, with a lateral extension or arm 16 which projects above the lever. The lever is fulcrumed upon the upper end of a rocking standard 17 mounted on the cap 141-, and on the upper end of the arm` 16 is pivoted an eccentric lever 18 adapted to bear upon the upper side of the hand setting lever 15. -Normally the piston will be held in the open position shown in the drawing, the pivotal connection between the lever and the rod being slightly below the horizontal plane of the connection between the lever and the standard, but, as the'supporting standard 17 may rock, the automatic closing' of the. valve underthe abnormal condition will be permitted.

A vent passage 19 is made in the valve piston to permit the escape of any oil which may possibly find its way into the space above the shoulder 12, and the inner end of this vent passage is located at the center of the lower end ot the piston. At the said end of the vent passage is provided a valve 20 which liberates the trapped oil and ermits the piston to seat very quickly w en the pressure at` the delivery side othe tion in which they are set.

device drops suddenly.

The lower end of the valve casing and the pressure chamber' 7 is closed by a` cap 21 secured to the casing, and threaded through the cap is a rod or stem 22 which is adapted to bear against the lower end of the valve and thereby limit the lowering opening movement ot' the same. The stem is equipped with a handle 23 at its lower end and, above said end, a locking plate 24 is secured thereto. A post 25 having a threaded lower portion 26, is secured to and depends from tlie cap 21 parallel with the stem 22 and passes through an opening provided therefor in a plate 27 which fits loosely about the stem and rests on the lockingY plate 24. The plates 24 and 27 are provided with openings therethrough which are adapted to register and a pin 28 is inserted through the registering openings to hold the plates in set relation. A nut 29 is mounted on the post 25 and bears upon the plate 27. It the nut be adjusted upwardly on the hanger post 25 and the pin 28 withdrawn, the stem 221 may be rotated and thereby moved endwise owing to its threaded engagement with the cap 21, being thus set to permit downward movement ot the valve 9 to the desired degree in an obvious manner. After the stem is set, the nut 29 is manipulated to hold the plate 27 close upon the plate AC and the pin 28 is replaced, the parts being locked in the posi- The piston valve 9 may thus be set and held at any desired distance from its lseat and, consequently, the quantity of oil passing into the delivery line may be easily regulated.

When the oil ,is admitted to the valve casing, it will fill the pressure chamber and rise to the port 6 through which it will flow it'y the valve 9 be lowered. Assuming the valve to be open, oil will be acting di- 1" rectly uponboth ends thereof and, as the tions are normal oil will be lower end is larger than the upper end, will tend constantly to lift and close the valve. This tendency, however, is effectually resisted by the rod 13 sothat as long as condidelivered. Should a leali, however, develop in the delivery line, the back pressure will be reduced at the top of the valve and the greater K pressure at the bottom thereofl will at once litt it to closed position and the iiow will be cut ofi. The locking eccentric lever 18 is set in the locking position until the initial circulation through the system is established and it is then manually released so that i 'Y upon the development ot a leali, the piston will be free4 to rise as described. 'Vhen the piston has been lifted to closed position in the stated manner, it 4will remain closed` until again opened by manual depression ot the lever 15 so that a premature opening of the valve cannot occur.

vHaving fully described my invention what having one end presented axially to said porty to seat thereon, the end remote from the valve seat being of greater area than the end nearer the seat whereby the pressure tends constantly to seat the valve, manually controlled means arranged to act on the valve to unseat vthe same, and means for locking the unseating means whereby to hold the valve open.

2. The combination of a valve casing, a free piston valve therein having both its ends exposed to pressure of fluid flowing through the casing, the end remote from the valve seat being of greater area than the end nearer the seat whereby the pressure tends constantly to seat the valve, a rod slidably mounted in the casing in vposition to bear upon the smaller end of the valve, a leverv supported on the' casing for rocking movement and pivotally attached to the upper end of the rod, a laterally extending arm at the upper end of the rod, and an eccentric mounted on said arm and bearing on the lever to lool: the lever and hold the valve in open position.

3. The combination of a valve casing, a free ypiston valve therein having both its ends exposed to direct pressure of a iiuid admitted to and normally iowing continuously through the casing, manually controlled means for unseating the valve and holding it normally unseated, means for limiting the movement imparted to thevalve by said manually controlled means, andy means for locking the last-mentioned means in a set position.

4. The combination lof'a valve casing, a free piston valve mounted in the casing and tending constantly to seat under pressure of a fluid admitted to the casing, means to act on one end of the valve for unseating the same, an endwise movable stem mounted in one side of the casing to engage the' opposite end of the valve to limit the unseating movement, a locking plate carried by said stem, a coasting plate fitting looselyupon the stem and bearing against the locking plate, means to prevent rotation of the coacting plate, and means to hold the plates in a set relation.

5. The combination of a valve casing, a free piston valve therein having both its ends exposed to direct pressure of a fluid admitted to and normally flowing continuously through the casing, manually controlled means for unseating the valve and holding it normally unseated, and means for limiting the movement imparted to the valve by said manually controlled means, the valve having a vent therethrough leading away from its seating end. Y

6. The combinatlon of a valve easing, a free pist-on valve therein havmg both ends exposed to direct pressure o a iuld admitted to and normally flowing continuously through the casing, manually controlled means for unseating the valve and holding it normally unseated, means for limiting the 10 movement imparted to the valve by said manualiy-controlled means, the valve havingl a vent leading away from its seating end, and a valve for said vent.

In testimony whereof, I have signed this 15 specification.

FREDERICK HEATH.

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