US642533A - Thermostatic-valve device. - Google Patents

Description

No. 642,533. Patnted Ian. 30, I900. J.-'A. SERRELL & m. uzncu. THEBMUSTATIC VALVE DEVICE.

(Application filed Feb. 24, 1899.)

(No Model.)

NITED STATES PATENT i .IOHN A. SERRELL, OF BAYONNE, NEW JERSEY, AND MEREDITH LEirori, OE BOSTON, MASSACHUSETTS, ASSIGNORS TO THE WARREN WEBSTER a COMPANY, OF OAMDEN, NEW JERSEY.

TH ERMOS TATI C-VALVE DEVICE;

SPEcIEIcATION forming part of Letters Patent No. 642,533, dated January 30, 19cc.

Application filed February 24, 1899. Serial No. 706,682. (No model.)

To a whom, it may concern.-

Be it known that we, JOHN A. SERRELL, of ayonne, Hudson county, New Jersey, and MEREDITH LEITCH, of Boston, Sufiolk county, 5 Massachusetts, have invented an Improvement in Thermostatic -Valve Devices, of which the following is a specification.

Ourinvention relates to thermostatic-valve devices; and it consists of the improvements which are fully set forth in the following specification and are shown in the accompanying drawings.

In thermostatic valves such as are used in steam-heating systems great sensitiveness I and positiveness of action are desirable. This is particularly true in those systems where a partial vacuum or lower pressure is maintained in the valve-outlet as compared with the inlet and the valve is designed to permit the passage or discharge of air or water of condensation, but to prevent the escape ofsteam. As the total expansion of such valves, due to the differences in temperature between water of condensation and steam at low pres- 2 5 sure, is limited, it is desirable that this total expansion should be available and that the element of lost motion, due to wear, 1oose-.

ness, or imperfect construction, should be eliminated.

0 Our invention is especially designed to render the total expansion available by taking up all lost motion due to looseness, ill-fitting, or wear between the thermostatic expanding piece and the parts which support it or are 3 5 controlled by it. This object we accomplish by the employment of a spring acting on the expanding member to take up all looseness between it and its support or the parts it operates, so that lost motion is eliminated and the total available expansion is Obtained.

Our invention also embraces other features and improvements, which are more particularly described and claimed hereinafter.

The accompanying drawing shows a ver- 5 tical sectional view of a thermostatic valve embodying our invention.

Our invention may be applied either to a globe or angle valve, and for purposes of illustration we have shown the construction embodied in an angle-valve.

In the construction shown our invention is illustrated to apply to a thermostatic valve of the character shown in our Patent No. 600,653, dated March 15, 1898. In that valve the expanding piece E is located within a cas- 5 5 ing I, which forms a closed compartment within the valve-body communicating through permanent openings g (shown in dotted lines) in the valve-seat D with the suction or discharge side and operates, when expanded, to close passage-ways e f through the valve-seat independent of the openings g and leading to the supply side of the valve-bod y. The construction is such that a lower pressure or partial vacuum maintained inthe discharge side extends into the chamber in which the expanding piece is located, and thus the expanding piece is protected from the direct action of steam at high temperature and pressure. In that patent the expanding member in one construction is shown carried at its upper end in an adjustable plug H and-in another construction loosely supported within the val ve-body. In either case there is liability of lost motion, owing to looseness between the plug and expanding piece or between the plug and its screw-threads; To overcome this lost motion, we employ the spring F, acting upon the expanding piece and pressing it against the plug H, thus preventing any looseness between the plug and expanding piece or between the plug and its threadway and rendering the total expansion available.

In the construction shown the expanding piece E is provided near its top with a shoulder h, which receives the thrust of the spring F, arranged within the valve-bonnet B. An annular washer M may be placed between the spring and shoulder h to act as a bearing for v the upper end of the spring and to prevent o injury to the composition of the expanding piece.

The expanding piece may be free from the plug H or directly connected therewith.

, The spring acts to hold the expanding piece 5 upon its seat or support and to take up all looseness, whether that looseness be between the expanding piece and the plug or between the plug and its threadway, and thus all lost motion is avoided and the total expansion of the expanding piece is rendered available, thus rendering the valve more sensitive and positive in its action.

The details of construction, which have been shown, may be Varied without departing from the invention.

We claim- 1. In a thermostatic valve, the combination of the valve-body, a valve-seat carried thereby, the upwardly-extending elongated bonnet B, the adjustable plug H carried by the valve-bonnet, the solid elongated expanding piece extending upward into the bonnet and having its upper end provided with a shoulder h and supported by the plug H, and the spring F having a fixed support at one end within the valve body or bonnet and thrust-- ing at its upper end against the shoulder at the upper end of the expanding piece, to maintain said expanding piece at all times in contact with its plug or support, but without aifecting the expansion or contraction of the said expanding piece.

2. In a thermostatic-valve device, the 00mbination of the valve-body, a fixed seat or support carried thereby, an elongated expanding piece for controlling the valve passage-way seated at its upper end upon said 'fixed seat or support, and a spring having a fixed bearing at one end and thrusting at its upper end against the upper end of the elongated expanding piece adjacent to the seat 'or support to maintain said upper end at all times in contact with its seat or support, but Without afiecting or controlling the movements of the expanding piece under contraction or expansion.

In testimony of which invention we have hereunto set our hands.

JOHN A. SERRELL. MEREDITH LEITCI-I.

Witnesses to John A. Serrell:

WM. I. SERRELL, JOHN G. EADIE. Witnesses to Meredith Leitch:

J. FRANK TUTTLE, WM. LANCASTER.

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