US1806791A - Valve housing - Google Patents

Description

G. c. DAvls VALVE HOUSING May 26, 1931.

Filed March 26, 192G- Patented May 26, 1.931

UNITED STAT-Es PATENT OFFICE GEORG-E C. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO G. M. DAVIS REGULATOR COM- PANYQVOF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS VALVE HOUSING Appueatimmea Maren se, 1926. serial No. 97,510.

y My invention relates to improvements in valve housings and the like and is particu` larly adapted for use in connection with those types of valves wherein a iiexible diaphragm is used associated withva pressure chamber which responds to variations in pressure in some part of the line to control or'operate the valve. One object of my invention is'V to provide a housing which will protect the working parts of the diaphragm and dash pot from the elements and avoid flooding, freezing and the like. Another object is to provide means for protecting the diaphragm when it is located in the same housing through which the material passes from the ejector eect of the rapidly moving` gas or water. Other objects will appear from time to time throughout the speciiication and claims.

Y My invention is illustrated more or'less 'diagrammatically in the accompanying draw- Figure l is a section through valve and housing; I

Figure 2 is, a plan view in part section alon the line 2 2 of Figure 1.

Li Ve part-s areA indicated by like characters.

-A is a valve housing communicating at one end with 4anintake pipeA1 at the other end with an exhaustpipe A2. A3 is a globe contained within the housing and `having valve seats A4 A5 through which gas or air or liquid maypass `from the intake to the outlet side of thepvalve housing. ,A3 is the valve barrel adapted to extend through the valve seats AA1 A5 andcarrvV valve discs' A7 A3 with guiding finders A9 adapted to guide the valve disc members toward and from the seats. lA10 isa yoke on the valve in yloose engagement with a valvev stem`A11 provided with a head A11 to engage the yoke.

The valve stem A11 extends up. through an aperture B at thetop of. the valve housing into the pneumatic control chamber vB1 which is located in a housing B2 having'a cover B3 and bolted onto the valve housing Aso that an opening the the wall of the housing B2V is in register with the opening B. Bl1 is a diaphragm held at its edges between flanges B1" B6V on the lcover and housing. This diaphragm is reinforced by plates B7 B8 sldable 'of the lever C3.

on a stud B9 and clamped againsttheshoulder B1"l to compress the diaphragm by means of the threaded connecting rod B11. The valve stem A11 is pinned between the ears Buon the stud B3.

The cover B3 is open to permit the member B11 to project outwardly above Athe diaphragm. A iange C surrounds this open .ing and projects upwardly from the cover.

Associated with the member B11 is a bell C1 which extends downwardly outside the flange C and in all positions extends down below the top of the flange. This bell carriesA the member B11 and terminates ina yoke C2 pivoted on the lever arm C3 which arm in turn is pivoted on a fulcrum arm C4 on the cover B3 and carries at its other end a yoke C5 having a bell C6 extending down and enclosing the C5 within the bell C3 and carrying the piston C3 slidable in the dash pot C".

The dash pot C7 is longitudinally adjustable in a split ring D, which ring may be clamped on the dash pot by means of a clamp screw D1. This ring'is pivoted at D2 on an arm D3 carried by the cover B3 so that the dash pot is given the necessary reciprocating movement to compensate for the movement An adjustable weight D4 is carried by the lever C3.

Experience shows that when gas is drawn thro-ugh the valve ata rapid rate of speed,

if the opening between the valve housing and the diaphragm housing is unobstructed, there is a tendency of the pressure in the diaphragm housing'to be reduced below the pressure in the valve housing as a result, of the vejector effect of the rapidly moving gas and thus the adjustment for the diaphragm movement will vary as the gas velocities vary even though the actual gas pressure may not vary. In order to prevent this, a xed diaphragm E is inserted in the throat between the valve housing and the diaphragm housing. This fixed diaphragm comprises a cup-like member flanged at E1 and held in place by clips E2 associated with the cap screws E3 which hold stem All and is provided with a sleeve E4 eX- tended upwardly along the valve stem All. This sleeve is in working contact with the valve stem, the contact being suiiiciently light so that no appreciable 'friction is set up but such thatairor gas circulation between the two chambers is minimized and the ejector ei'fcct Completely dissipated. E is a pipe leading from the interior ot the diaphragm housing B to the pipe A1 so that the pressure in the diaphragm housing is the same as the pressure in the intake pipe.

This arrangement ot diaphragm in the throat between the diaphragm housing and the valve housing and the protecting mantle or bell protecting the open month or surface of the diaphragm and the dash pot though illustrated here as applied to a casing head regulator may be used either separately or in conjunction with many different valve arrangements and particularly the bell and housing for the diaphragm may l`e used in connection with any valve arrangement or mechanism where the valve is exposed to the elements or dust, dirt and the like.

It will be evident that while I ha ve shown in my drawings an operative device still many changes might be made in the size, shape, arrangement and disposition of parts without departing materially Jrom the spirit of my invention and I wish, therefore, that my showing be taken in a sense diagrammatic.

The use and operation ot my invention are as follows:

Gas fiow is in the direction Jfrom right to left in Figure l. lith the valve in the closed position as shown in Figure l, gas does not pass through. Some gas, however, passes through the by-pass pipe into the underside of the diaphragm chamber, exerting a pressure on the diaphragm. When the pressure exceeds a predetermined amount the diaphragm is forced up, opening` the valve and permitting flow onward through the pipe A2. Movement ot the diaphragm and valve stem is resisted by the dash pot, which is connect-ed to the diaphragm and valve stem by the counterweighted lever and the pin extending up outwardly. through the housing. To minimize friction both the dash pot and t-he sleeve surrounding` the pin where it extends through the housing are inclosed by long parallel-sided bells.

In order to protect the diaphragm chamber from the influence of gas movement eddy currents and the like which are set up in the valve chamber and which might transmit themselves through the open throat between the valve chamber and the diaphragm cham.- ber about the valve stem, thc iexible sleeve shown is provided. This sleeve is held in position in the open throat, makes -flexible sliding` contact with the valve stem, is long enough so as not to bind on the valve stem,

` and is flexible enough so that it does not need to be accurately centered with respect to the valve stem and the throat but does give a substantially entire measure of protection and avoids the danger of impact ot' turbulent gas bodies upon the diaphragm, which impact might change the operation ot the valve and make it less sensitive to the pressure variations to which it is intended to be sensitive.

I claim:

l. In combination with a valve and diaphragm controlling it, a housing for the diaphragm, a valve housing adjacent thereto, a control stem projecting upwardly from the diaphragm, a sleeve proijecting upwardly trom the diaphragm about sai-d stem and out of contact therewith, a lever, a connection between said control stem and said lever, a bell, associated with said control stem, depending about said sleeve and out of Contact there-- with, a stem depending downwardly from said diaphragm, a valve associate-d with said valve stem, in said valve housing, said valve housing being formed with a valve seat in which said valve is in slidable engagement, and ieXible packing means, in slidable engagement with said last mentioned downwardly depending stem adjacent the point where it extends from the diaphragm housing into the valve housing.

2. In combination with a valve, a valve housing, a valve reciprocable therein, a diaphragm housing associated with the valve housing, there being a throat oining them, a valve stem passing through the throat upwardly from the valve, a diaphragm in the diaphragm chamber associated with the valve stem, a` supply pipe adapted to conduct gas to the valve chamber, a by-pass pipe leading from the supply pipe outside of the valve chamber and Adischarging into the diaphragm chamber, a thin flexible gland closing the throat between the two chambers, the gland having al central flange in slidable engagement with the valve stem and anchored in position in the throat so as to be tree to move in a plane perpendicular to the valve stem to compensate for variations in position of the valve stem.

3.. In combination with a valve and diaphragm controlling it, a housing for the di aphragm, a valve housing adjacent thereto, a control stem projecting upwardly tromv the diaphragm, a sleeve projecting upwardly from the diaphragm about said stem and out of contact therewith, a lever, a connection between said control stem and said lever, a bell, associated with said control stem, depending about said sleeve and out of Contact therewith, a stem depending downwardly from said diaphragm, a valve associated with said valve stem, in said valve housing, said valve housing being formed with a seat in which said valve is in slidable engagement and flexible packing means, engaging said last mentioned downwardly depending stem adj aoent the point Where it extends from the diaphragm housing into the valve housing, the leXible packing being in slidable engagement with the stem and free to move in directions perpendicular to the stern to p-revent binding.

Signed at Chicago, county of Cook, and State of Illinois, .this 11th day of March,

GEORGE C. DAVIS.

Images