US2644485A - Manually and fluid pressure operated valve - Google Patents

Description

July 7, 1953 A. F. SCHWEND'NER' MANUALLY AND FLUID PRESSURE OPERATED VALVE Filed NOV. 19, 1949 FIGB.

INVENTOR Anthony F. Schwendner aye, 5a.

' ATTORNEY WITNESSES: W. o 9 7n Cowt) Patented July 7, 1953 MANUALLY AND FLUID PRESSURE I OPERATED vALv Anthony F. Schwendner, Ridley Park, P assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsyl vania Application November 19, 1949, Serial No. 128,355

- 3 Claims.

The invention relates to an oil-operated throttle valve and it has for an object to provide manually operablev mechanical means for. opening the throttle valve incident to starting, atwhich time the .oil pressure is insufiicient, and which mechemical means is' automatically" disconnected upon development of sufficient oil pressure.

.The foregoingand other objects are effected by: the invention as will be apparent from thefollowing description and claims taken in connection with the accompanying drawings, forming a part of this application, in which:

Fig. 1 is an elevational view showing the throttle valve applied toa turbine; r a

Fig; 2 is a sectional view of the valve; and

Fig.3 is a detail viewof the releasable key for the hand wheel.

In the drawing, there is shown'a steam turbine, at M, having a steam supply conduit H provided with throttle and governing valves l2 and 14. As is customary, the throttle valve is normally held'openby means of oil under pressure supplied to a space from any suitable source, as by the orifice l6.

As shown, the space I5. is defined in part by the conduit l8 in communication with the lower portion of the throttle valve operating cylinder i9 having thepiston 28 thereinconnected to the rod 2!, carrying the movable throttle valve element 22. The piston is normally held in upward position to hold the throttle valve open by means of oil under pressure supplied by the conduit [8, the force of such pressure acting upwardly on the piston 20 to hold the throttle valve open against the force of the spring 24 arranged above the piston.

The conduit i8 has the usual trip valve 25 associated therewith and tripped by the emergency governor 26 to responseto over-speeding of the turbine, whereupon, due to sudden release of pressure below the piston 20, the latter is moved downwardly by the spring 24 to close rapidly the throttle valve. To enable the throttle valve to be opened when starting, at which time insufiicient pressure is supplied by the conduit l8, manual-means is provided for this purpose. Accordingly, the upper end of the cylinder has a cover 28 having a central threaded opening 30 in which there is arranged a threaded sleeve 3| coaxial with the rod 2i and the piston 20 and a hand wheel 23 is attached to the outer end of the sleeve, the sleeve extending inwardly of the cylinder and toward the piston 20.

The piston 20 has attached to its upper side the stem nut construction 32 having a socket 33 into which extends the spindle or stem 34. A ball thrust bearing 35 is retained in the socket 33 and it is. connected to the lower end of the spindle 34. Thus, the spindle 34 has a swivel connection with respect to the piston 20, and the valve stem 2 I.

The outer. end of the spindle 34 has a channel 36 providing an abutment collar 31 having an inner abutment surface 385 The hand wheel has a latch member 39 pivoted thereto at 40 and having a notch 4| so that, with the piston 20 in its lowermost position and the sleeve screwed down by the hand wheel, the latch 39fimay be positioned to be swung, so that thenotch 4| engages about the neck 36 withthe-upper abutment surface 42 of the-latch engaged underneath the collar 38. Aspring 43 is carried by the hand wheel and it is normally effective to swing the latch member 39 about its pivot 40 to clear the upper end of the stem 34.

With" the latch member held in position back of the stem collar 31, the hand wheel. 23 may be turned outwardly until sufficient friction is developed between the abutment surfaces 42 and 38 to hold the latch member in engaged position and against the force of its spring, the latch member being so held while the hand wheel 23 is operated to pull the throttle valve open against the force of the spring 34.

With the emergency governor latched in position to provide for development of pressure in the pressure space. l5 and with the throttle valve 'opened normally to the extent required and in the manner just described, steam is admitted to the turbine for rotation of the latter; and, when sufficient pressure is developed in the space l5 to exert force on the piston against the spring 2:1 to relieve the normal force between the surfaces 38 and 42 the latch is released, whereupon oil under pressure supplied by the conduit is is adequate to move the piston to open fully the throttle valve.

While the invention has been shown in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof What is claimed is:

1. A throttle valve for a turbine provided with an emergency governor, a piston operatively connected to the throttle valve; a casing structure including a cylinder for the piston; means for applying oil under pressure to the piston to exert opening force on the throttle valve; a spring interposed between a portion of the'casing structure and said piston for exerting closing force on said through said sleeve, said spindle having a collar engageable by said latch when saidxoilpressure is less than the force of said spring, so that the latch, when in engaged position, provides, for opening the valve by rotation of the handg'wheel when the oil pressure actingflonltheqpiston is, in-,

adequate for this purpose; and biasing means for tripping out the latch upon disengagement therefrom of said collar of- :thespindle when the force of oil pressure acting on theapiston exceeds the force of the spring thereby providing for, closing of the throttlevalve by thespring when the: oil pressure is removed; I

2. A throttle valve provided with a stem for opening andclosing it; a piston-connectedto the stem," a cylinder for the piston; saidcylinder having abottom through'whichrthe stem extends and a cover; a spring interposed between the cover and the piston 'for' exerting valveclosing force on the latter; 'a passage 'for' supplying liquid to the cylinderbetween the bottom and the piston for applying'to the latter valveopening force in opposition to the valve-closing force of the spring; a sleeve having threaded connection with respect to the cover and extending into the cylinder; a hand wheel attached to the outer-end of the sleeve; a spindle having swivelled connection with respect to the stem and arranged to slidably extend through the sleeve; said-spindle having-an outer shoulder provided with an inner abutment faceya latch carried by the hand wheel and having airouter -face engageable frictionally with the shoulder inner abutment face so that, with turning-of the threaded 'sleeve and engagement ofthe latch and shoulder abutment faces to move 'the'stem in a valve opening direction against the force of the spring, the-spring exerts sufiicient force frictionally engaging the abutment surfaces of the latch and of the shoulder to hold the latch and spindle in engagement; and a spring-for moving the latch clear of the spindle upon sufiicient reduction in frictional engagementof the latch and,

4 shoulder abutment surfaces incident to opening force of liquid pressure applied to the piston.

3. In a throttle valve device for a turbine, the combination with a valve having a stem, of a piston connected to the stem; a cylinder for the piSt0n;,-'Said' cylinder having a bottom through which the stem -extends and a cover; a spring interposed between the cover and the piston for exerting valve-closing force on the latter; a passagefor supplying liquid to the cylinder between thebottom and the piston for applying to the latter valve-opening force in opposition to the valve-closing force'of the spring; a sleeve having threaded connection in an opening of the cover and extending into the cylinder; a hand wheel having an apertured hub attached to the outer end-,of-thesleeve; aspindle having swivelled connection with respect to the stem and arranged to slidably extend through the sleeve and said apertured hub; said spindle having an outer shoulder providedpwith an. inner. abutment face; a latch, carried by .thehand wheel. and having an outer-iace; engageable frictionally; with. the shoulder. inner abutment faceso that, with. turninguof the, threadedsleeve. and, engagement of the latch and. shoulder. abutment-.;fac.es to move. the stem. in. a valve opening 1 direction-against, the force of the spring, the spring exerts suiiicient forcepfrictionally engaging the abutment surfacesof the latch and of the shoulder to hold the, latch and spindle in engagement; and a spring for moving theglatch clear of the spindle upon sufiicientmeduction infrictional engagement of the latch and shoulder abutment surfaces, in cidentuto application of liquid pressure to the piston for opening the valve, said spindle being thereafter freely movable relative to saidapertured-hub according, to variations in pressure of oil on said pistonand regardless; of theposition of said hand wheeli,

ANTHONY F. SCHWENDNER.

References Cited in, the ,file .of this patent UNITED STATES PATENTS Number Name Date 430,101 Zalinski June 10, 1890 631,146 Batchelor Aug. 15, 1899 1,722,754 Knauf' July 30, 1929 1,836,506 Rasmussen et a1. Dec. 15, 1931 2,403,427 Ludeman July 2, 1946

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