US926755A - Non-return stop-valve. - Google Patents

Description

N. O. LOUKBQ NON-RETURN STOP VALVE.

APPLICATION FILED APR. 20, 1909.

926,755. I Patented July 6, 1909.

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NW 6, 5 awwm UNITED STATES PATENT OFFICE.

NATHANIEL U. LOCKE, OF SALEM, MASSACHUSETTS, ASSIGNOR TO LOlliE REGULATOR COMPANY, OF SALEM. MASSACHUSETTS, A CORPORATION OF MASSMTIIUSETTS.

NON-RETURN STOP-VALVE.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed April 20, 1909. Serial No. 491,156.

To all whom it may concern:

Be it known that I, NATHANIEL 0. Leona, of the city of Salem, county ol Essex, and Commonwealth of Massachusetts, have invented a new and useful Improvement in Non-Return Stop-Valves, of which the following is a full, clear, and exact description.

My invention relates to improvements in non-return stop valves such as are arranged between the boiler and the point or points where the steam is to be used, so that in the event of the bursting of a flue or other accident on the boiler side of the valve, the latter will immediately and automatically close so as to prevent any further passage of steam from the service pipes or other part of the circuit.

The object of this invention is to improve the construction of valves of the kind referred to so that a simple, inexpensive and yet absolutely reliable valve can be pro duced, which, so long as conditions are normal, will permit the desired flow of steam, which, however, will act quickly and posi tively in the event of an accident to close the valve, and which has hand operated means .for locking the valve in closed position.

My invention is intended further, to provide the main closing valve with a disk which is arranged below it and on the same spindle, so that the downflow of steam will strike the disk and quickly close the valve, after which the pressure on the back of the valve will hold it closed, and further, to construct the disk so that it will be adjustable on the spindle of the valve. I also provide a spring which will itself have a tendency to close the valve, and thus the valve is made absolutely positive by these several safeguards. All this will be clearly understood from the description which follows.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in the view.

The figure is a central vertical section of the valve showing my improvements.

The valve has a casing 10 substantially like the ordinary globe valve casing, with an inlet 11 at one end and outlet 12 at the other, and the valve is intended to lie horizontally. It has the usual internal partition 13, and the seat is formed on the rim of the spider 14 which screws into the opening through the partition so that the flow of steam is through the spider. The valve 15 is fast to a spindle 15 and closes upon the valve seat. The spindle 15" is guided at the top in a yoke 16 which is pendent in the cap 16, and this is of larger size so that when removed, the valve, the spider, and all the inner parts can be readily removed. The lower end of the spindle 15 is guided in the bottom of the casing 10 and it has coiled around it a spring 18 which abuts with the bottom of the valve casing and with the collar 19 which is contained in the removable bonnet 20. Thus the pressure of the spring 18 will close the valve when there is nosteam flowing through.

In practice the valve lies upon its side, that is with the spindle 15 extending in a horizontal direction.

An important feature 01: this invention is the disk 21 which is cup shaped preferably, and which is adjustable on the spindle, and by moving it up and down and then securing it by means of the ordinary nuts 21 shown in the drawing, the exact and desired position of the disk is secured. The top of the spindle 21 abuts with the stem 22 which extends from the gland A3, and is threaded in the bridge or yoke 24 on the top of the outer cap 16, the end of the valve stem being provided with a hand wheel 25 or equivalent device for turning it.

If the stem 22 is raised, the flow of steam through the valve casing will strike the valve 15 and open it so that the flow will be continuous and uninterrupted, but on any backflow of steam resulting from any cause whatever, the said back-llow will strike the disk 21 and also the back of the valve 15 and close the valve tightly. The valve can also be locked down by the stem 2-2 as usual in valves of this general kind.

I am aware that it is not broadly new to provide a non-return stop valve which will be closed by the back-flow of steam pressure, but the features which I have enumerated make this valve particularly sensitive as well as reliable, and it is a valve that can be easily and economically made and safely used.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A valve of the kind described, compris ing a casing having an internal valve seat, a spindle extending through the seat and guided on opposite sides of the seat, and a cup-shaped piston on the spindle and on the side of the seat opposite the valve, the piston being so arranged that its concave side is toward the valve.

2. A valve of the kind described comprising a casing With an internal valve seat, a spindle extending longitudinally through the casing and having guides on opposite sides of the valve seat, a valve on the spindle to close against the seat and a cup shaped piston on the spindle on the back side of the valve seat.

3. A valve comprising an internal valve seat, a spindle extending through the seat, a valve on the spindle opposite the seat and a cup shaped piston on the spindle back of the valve seat, said piston being adjustable on the spindle.

4. A valve comprising a casing having an internal valve seat and a removable cap above the seat, a yoke on the inside of the cap, a spindle extending through the seat and guided in the yoke and in the lower part of the casing, and a cup-shaped piston on the spindle behind the valve seat.

5. A valve comprising a casing with an internal valve seat, a spring pressed spindle extending longitudinally through the seat, a valve on the spindle to close against the seat, and a cup shaped piston on the spindle behind the valve seat.

6. In a valve, the combination of a casing having an internal valve seat, a spring pressed spindle guided at its opposite end portions and extending through the seat, a

valve on the spindle to close against the seat, a piston on the spindle behind the valve seat and a hand operated valve stem extending into the casing and in alinernent with the aforesaid spindle.

NATHANIEL C. LOCKE. Witnesses:

FRED W. PooR, MARTHA J. CLANoY.

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