US833420A - Stop-check valve. - Google Patents

Description

PATENTED OUT. 16, 1906.

v L. SGHUTTE. STOP CHECK VALVE.

APPLIOATION FILED FEB.14. 1906.

2 SHEETS-SHEET l.

INV EN TOR No. 833,420. PATENTED OCT. 16, 1906. L. SGHUTTE.

STOP CHECK VALVE.

APPLIOATION FILED FEBJA. 1906.

2 SHEETS-SHEET 2.

WlTfiJ-ESSES INVENTOR UNITED STATES PATENT OFFICE.

LOUIS 'SOHUTTE, OFPHILADELPHIA, PENNSYLVANIA, ASSIGNORITO SUHUTTE AND KOERTING COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

i STOP-CHECK IALVE.

Patented Oct. 16, 1906.

Application filed February 14,1906. Serial No. 300,955.

To a whom it may concern:

Be it known that I, LOUIS SoHUTTE, a citizen of the United States of America, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Stop- Oheck Valves, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to valves such as are placed in steam-pipes leading from a boiler to an engine, said valves opening freely under a normal flow of steam and closing under a reverse flow.

The object of my invention is to providemeans for promptly and powerfully closing such valves against the boiler-pressure and also for preventing chatter and to attain these results by improved and convenient mechanism and constructive details.

The nature of my improvements will be best understood as described in connection with the drawings, in which they are illustrated, and in which Figure 1 is a central vertical section through a valve embodying the broader features of my invention; Fig. 2, a similar section through a modified form of valve, also embodying leading features of my invention; Fig. ,3, a similar section through my preferred valve construction embodying all features of my invention; Fig. 4, a cross-section on the line 4 4 of Fig. 3 and Fig. 5, a similar section through a portion of a valve, illustrating a practicable modification of, my invention.

Referring first to the construction of Fig. 1, A is the valve-casing, having an inletchamber B and outlet-chamber B and a valve-seated opening B intervening between these chambers. The upper or outlet chamber B has an opening at its top which is closed by the head B an open-ended cylinder C being secured in place by this head immediately above the valve-seat. D is the valve, which is formed with an upwardly-extending stem D and a downwardly-extending stem D the stem D having secured to it the piston E, working in the cylinder O, the fit between the cylinder and piston being such as to permit a restricted flow of steam past the piston into the upper end of the cylinder. The downwardly-extending stem D F in the cylinder or by a small orifice, such as.

0, formed in the piston.

L is a valve-closing stem actuated 1n any convenient manner from above the valve-casing and normally retracted, but capable of being forced downward, as shown in Fig. 1, to keep the valve' closed, the head L resting on the bottom of the piston E or the end of the valve-stem D, as shown. In normal operation the cock I is closed and the cylinder H below the piston filled with steam at the same pressure as that in the chamber B. Under these circumstances the valve D will be opened, leaving an unobstructed passage through the casing for steam from the boiler. The restricted orifice into the cylinder O permits this cylinder also to be filled with steam at the same pressure as that in the, chamber B; but by opposing any rapid fluctuation in the pressure the piston E acts to prevent any chattering of the valve on its seat, and also in case of any fall in pressure infthe boiler to assist in the prompt seating of the valve. When it is desired to close the valve against normal boiler-pressure, it is only necessary to open the cock I permitting the steam in the cylinder H to exhaust, whereupon the pressure on the top of the pistonFwill at once cause the valve D to seat itself, closing off further flow ofsteam.

In the modification shown in Fig. 2 the valve-casing, here indicated at A, is formed with an inlet-chamber B and outlet-chamber B connecting through a valve-seated port, as before, the casing being formed with anopening above the valve-seat closed by a head B which secures in place a cylinder O, as in the before-described construction. In this construction the piston E, moving in cylinder C, is connected with a valve D through an extension D which is virtually a continuation of the piston, leaving a similar amount of the upper face of the valve exand the chambers B and K.

D to the bottom of the cylinder H,

The downwardly-extendposed to pressure.

connects, as before, with a ing valve-stem D istonF, which moves in a cylinder (indicated I In both modifications heretofore described itis necessary to provide means for securing the cylinders H valve, and the piston working in it to be inserted from below. It is obviously advantageous, however, that the whole structure should be insertible and withdrawable through the usual top opening in the casing, and this I have provided for in the construction shown in Fig. 3, in which the valve and the ports above the valve are secured in a casing (indicated at A) and having inlet and outlet-chambers B and B in the same manner as already described in theearlier modifications. The casing in the port forming the chamber B is, however, formed with a'cylinder-seat K of generally cylindrical form and provided, as shown, with vertical ports K, communicating with lateral ports K. The lower chamber of this casing (indicated at K) connects through a port K and outlet-pipe K the exhaust-pipe K being provided with a cock I, as already described. In this cylindrical casing K is inserted a double cylinder H H, the two parts being separated by a partition H below which a series of ports H connect-the lower cylinder H with the ports K and K, a series of conically-ended bolts N serving both to lock the cylinder in posi tion and to regulate the amount of flow through the ports K to the ports K. The downwardly-extending valve-stem has secured to it a piston F, working in the upper cylinder H and a downwardly-extending hollow portion D of the piston-rod has secured to it the piston F working in the lower cylinder-chamber H. The cylinder H below the valve F, is in free communication with the chamber K, forming the end of the cylinder II. In this construction it will be seen that the steam in the inlet-chamber B will have restricted access to the cylinder I-I past the loose-fitting piston F and free access from said cylinder through the hollow stem also that the lower part of the cylinder H is in restricted communication with the ports K Obviously when the outlet-cock I is opened the steam escapes freely from the bottom of both cylinders, and the pressure on the tops of both pistons will at once press the pistons down and carry the valve D to its seat. The advantage of this construction is that it en- H in position beneath thewhich will permit both the cylinder ables me to obtain an effective piston area greater than that of the valve D, while at the same time the two tandem-set pistons and the cylinder-casing in which they work can be withdrawn and inserted through the valve ort.

p In the construction shown in Fig. 5 I have indicated a construction in which the cylinder C is dispensed with, a cylinder D being formed in an upwardly-extending valve-stem D through a packing M, at the end of which extends a plunger-like extension L of the usual valve-stem used for locking the valve D closed. Obviously this construction embodies some of the merits and advantages of the cylinder 0, as described in the other modifications, and I insert it in this figure of the drawings simply to indicate that I do not wish to be confined strictly to the special construction involving the use of the cylinder D and piston E.

Having now described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A valve-casing having in combination a stop-check valve set to open in the direction of the normal flow of fluid, one or more cylinders of greater aggregate area set in the admission side of the casing, a piston attached to the valve and fitting in the cylinder, a restricted constantly-open passa e whereby the fluid in the casing will gradua ly enter the cylinder below the piston, a port leading from the cylinder to exhaust and a valve for opening and closing said port.

2. Avalve-casing having in combination a stop-check valve set to open in the direction of the normal flow of fluid, one or more cylinders of greater aggregate area set in the admission side of the casing, a piston attached to the valve and fitting in the cylinder, a restricted constantly-open passage whereby the fluid in the casing will gradually enter the cylinder below the piston, a port leading from the cylinder to exhaust, a valve for opening and closing said port, a second cylinder set in the receiving side of the casing and a second piston also attached to the valve and fitting in said cylinder, and means whereby the fluid in the casing can gradually pass to or from the cylinder above the piston.

3. A valve-casing having in combination a stop-check valve set to open in the direction of the normal flow of fluid, two 0 linders, each of smaller sectional area than the valve and together of greater area arranged in tandem in the admission side of the casing the upper ends being open thereto, two tandem pistons fitting in said cylinders and both secured to the valve, means whereby a restricted flow of fluid is permitted from the casing to the under sides of the istons, ports connecting the tandem cylin ers toexhaust and a valve for opening and closing the exhaust.

4. A vaive-caslng having in combination a stop-check valve set to open in the direction of the normal flow of fluid, a cylinder-casing of less external diameter than the opening in the valve-seat having formed in it two tandem cylinders, means for securing said casing in the admission side of the valve-casing, two tandem pistons fitting in said cylinders and both secured to the valve, means whereby the fluid in the valve-casing is gradually admitted to the cylinders, ports connecting the cylinders to exhaust and a valve for opening and closing the exhaust.

5. A valve-casing having in combination a stop-check valve set to open in the direction of thenormal flow offiuid, a cylinder-casing of less external diameter than the opening in the valve-seat having formed in it two tandem cylinders, a fixed cylinder-receiving chamber in the admission side of the casing and having a chamber K adapted to form the bottom of the lower tandem cylinder, a port leading from said chamber to exhaust, a valve for opening and closing the exhaust, a connected to the main valve working through both cylinders and opening at its end into the lower cylinder and through its side into the upper cylinder, two pistons secured to said rod and working in the tandem cylinders, and means whereby the fluid in the valve-casing has gradual admission to the two cylinders.

LoiiIs SOHUTTE.

Witnesses: D. W. HILDRETH,

T. H. KOEHLER.

Images