US151712A - Improvement in check-valves - Google Patents

Description

j the valve.

UNrEn STATES PATENT OFFICE.

JAMES MORRISON, OF TORONTO, CANADA.

IMPROVEMENT IN CHECK-VALVES.

Sp ecication forming part of Letters Patent No. 151,712, dated June 9, 1874; application filed February 21, 1874.

To. all whom it may concern: f Be it known that I, JAMES MORRISON, of

` the city of Toronto, in the county of York,

in the Province of Ontario, Canada, brassfounder, have invented new and useful Improvements in Check-Valves and l do hereby declare that the following is a full, clear, and accurate description' thereof, whereby others skilled in .the art might make and use the same, reference being had to the accompanying drawings forming a part of this specification.

This invention relates to the ordinary globevalve, and to the ordinary check-valve-that is, it can be used as occasion may require as a globe-valve-but it relates more especially to the check-valve, upon which valve it is an improvement of considerable importance,

when used in connection with the feeding ap- Vsticks up and does not fall on the seat, al-

though it may be of good workmanship. This occurs from various causes, and, when it does stick up, the water rushes back from the boiler and prevents the proper action of the pump; and, in such cases, the check-valve has to be examined by taking ofi' the cover and doing what is found necessary in order to liberate This cannot be done without much difficulty, and frequently much delay, unless there is also a separate valve placed in the aforesaid pipe, viz., a globe-valve, and this somewhere between the aforesaid check-valve and the boiler, which globe-valve, in vsuch cases, would be closed down to prevent the water rushingback from the boiler while the check-valve was being put in working condition. My combined adjustable check and globe valve is for the purpose of overcoming this diiiculty, as it answers the purpose both as a check and a globe valve, and will be less expensive than the two separate valves. My improved valve, however, is desirable in all feed pipes, even when there is a separate globe-valve, as it sometimes hapens that the globe-valve also gets out of order, when the sole dependence is again on the check-valve; hence the necessity of having a valve that is thoroughly reliable, and that can be adjusted without difficulty and without delay.

In the accompanying drawings, the same letters of reference indicate the same parts in all the views, and also in the following specificaton.

Figure 1 is a longitudinal sectional elevation, in which the several parts of the valve are distinctly seen, and will be readily understood.

A is the chamber of the valve. B is the valve-seat; G, the adjusting-stem, which is operated by the hand-wheel W. D is the valve; E, the valve-stem; F, the cap on top of adjusting-stem C.

Fig. 2 is an end elevation, showing most of the parts designated in Fig. 1, with the exception of the valve-stem E.

Returning to Fig. l, it will be seen that the adjusting-stem C is operated, as aforesaid, by the hand-wheel W, and is shown close down on the back of valve D. In turning the handwheel W backward,`the adjusting-stem C is moved up from the back of the valve D, by which it is liberated and left free to act, and will now act as acheck-valve, and while so acting, should the valve' D get fast and cease to act as a check-valve, it can be moved down, so as to bear slightly on the seat, by means of the adjusting-stein@ and, by unscrewing the cap F, the stemV C can be turned round until the valve is loose. The cap F is then replaced and J(he stem C raised up, as before, by the wheel W. The valve D will now be perfectly free and in working condition, the adjustment having been made without difficulty, and also without delay. When used as a globe-valve, a pin, g, is inserted in stem E on top of stem C. The cap F constitutes an important feature of my construction, as it prevents the escape of water and steam 5 and there is no stuffing to prevent the stem and valve from rising and falling in the action of the parts as in cheek-valve. The construction, therefore, valve D, stem E, end Gap F, substantieiiy as necessarily differs from that required for shown and described, and for the purposes merely grinding the valve. v hereinbefore set forth. y Having thus described my invention, I JAMES MORRISON. claimv WVitnesses:

The combination of the chamber A, Valve- HENRY NEVILLE,

seat B, adjusting-stem C, with hand-Wheel W, WILLIAMGILL.

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