US1411795A

US1411795A - Valve-seat retainer

Info

Publication number: US1411795A
Application number: US448414A
Authority: US
Inventors: Chester W Metzgar
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1921-02-28
Filing date: 1921-02-28
Publication date: 1922-04-04
Anticipated expiration: 1939-04-04

Description

C. W. METZGAR.

VALVE SEAT RETAINER.

APPLICATION FILED rmza. 1921.

Patented Apr. 4, 1922.

c E B Falllll :III U! 1' t 'T w/ A j a 5 J INVENTOR lw/ ATRNEY UNITED snares PATENT OFF ics.

CHESTER w. METZGAR, or EASTON, PENNSYLVANIA, assrsnon, T0 INGERSOLL- inn COMPANY, or JERSEY CITY, NEW JERSEY, A CORPORATION on NEW JERSEY.

VALVE-SEAT RETAINER.

Specification of Letters Patent.

Patented Apr. 4, 1922.

To all to 710m it may concern Be it known that l, Cnnsrnn \V. METZGAR, a citizen of the United States, and a resident of Easton, county of Northampton, State of Pennsylvania, have invented a certain Valve-Seat Retainer, of which the following is a specification accompaniedby drawings.

This invention relates to compressors but more particularly to valve seat retaining devices for retaining the valve seats and valves in position in the valve openings in the inner wallof the compressor head until the covers and valve securing devices are adjusted on the outer wall or shell of the compressor head. Y

In a compressor head in which the valves, as for instance, plate valves, are arranged substantially vertically or at an angle to the vertical in the wall of the head, ditliculty has been experienced in temporarily retaining or supporting the valve seats carrying valves, in adjusted position in the valve openings, while the covers and permanent valve securing devices usually in the form of set screws or studs passing through the covers, are being adjusted in position and secured in place.

The valve seats and valves may tend to tip or fall outwardly and downwardly while the covers are being adjusted and in practice, one method is to loosely secure the valves tothe valve securing cover studs, and adjust the valves and covers at the same time, but with valves ol l'arger diameter in particular, the adjustment oi the valve seat and valve in its opening may not be accurate so that leakage or other more serious troubles result. Again, the workman cannot see what he is doing, since the cover obscures his view through the outer cover opening in the head, and for this reason he may not set the valve seat accurately in theinner opening.

The primary object of the present invention is to enable the valve seats to be accurately adjusted and temporarily retained in the valve seat openings in the inner wall of the head, while the covers are removed so that the workman can plainly see the adjustment, and may afterwards secure the covers and permanent Valvesecuring devices inposition without disturbing the adjustment al.- ready made.

Further objects of the invention will hereinafter appear and to all of these ends the invention consists of the Features of construction and combinations of elements fully described and claimed in this specification and illustrated in one of its preferred forms in the accompanying drawings, in which l lgure 1 1s a diagrammatic horizontal sect onal plan view takenthrough a portion of thehead of a compressor showing valve seat retaining device about to be adjusted in position; I

Figure. 2 is a view similar to Figure 1 showing the valve seat retainer adjusted in position and the cover and permanent securmg device also adjusted; j Figure 3 is a detail perspective view of the jam nut shown on the valve stud;

Figured is a detail perspective view of a valve seat holder or retainer in the form ot a spring strip provided with engaging means for an adjusting tool;

Figure 5 is a longitudinal sectional view taken through Figure at, and

Figure 6 is a detail broken view through the'cover opening showing the valve seat retaining strip in different positions of adjustment.

Referring to the drawings, a type of compressor head A is shown suit'able for illustrating the advantages and mode of operation of my device, and I have only chosen to show a broken portion of the head for simplicity and one valve and valve seat retaining device, it being understood however, that the invention may be used with any type of compressor head to which it is found applicable. In the present instance, the axes of the valves may be substantially parallel to orat an angle to thelongitudinal axis of the compressor cylinder,

The head illustrated is provided with the valve seat openingsB in the inner wall C adapted to receive the valve seats D in this instance adapted to carry plate valves of any suitable type. The openings B as shown are provided with the rabbeted or counterbored portions E for seating the flanges F of the valve seats D. The valve shownin this instance is a discharge valve, but the invention applies equally to either inlet or discharge valves. i

The outer wall G of the compressor head is provided with openings I'Icorresponding to the openings B and the usual cover J, of which only one is shown, are provided for closing the outer openings after the valve seats and valves are in place. An adjust- Ill) preferably in the form of a set screw K V valve.

passes through the cover for securing the valve seat in final position and a nut K is preferably provided on said set screw. Cover holding means which may be in the form of tap bolts L are provided for securing thecover to the head.

In order to temporarily maintain a valve seat D in its opening B, with the cover J removed, I provide a removable valve holder in the form of a metallic spring retaining strip 0 adapted to be adjusted over a central projecting member on the valve seat, with the ends of the strip O-arranged beneath the edge of the cover opening H. In this instance the valve seat is provided with a central stud P having a gland nut Q and a jam nut R projecting towards and preferably into the cover opening H when the valve seat is seated as indicated in Figures 1 and 2. Washers S may be provided on the stud P between the gland nut Q and the jam nut R for adjusting the distance to which the jam nut projects into the cover opening H. The projecting end of the am nut R is preferably provided with the re uced portion T and the spring retaining strip 0 is preferably provided with a central aperture U adapted to be slipped over the reduced end T of the jam nut as indicated in Figure 2 when the retaining strip is in holding position with the ends V beneath the edges of the cover opening H. In such holding position, the spring strip 0' is preferably flexed as indicated so that spring pressure is exerted to hold the valve seat temporarily in position until the set screw K is-screwed up and adjusted, as indicated in Figure 2 to hold the valve seat securely in position. v

The spring retaining strip 0 may be providedwith notches W or tangs X to afford abutments or projectionsto enable the strip to be manipulated by a tool in adjusting the strip in position or for otherwise engaging the strip to dismount the valve seat and The spring strip 0 may be inserted through the cover opening H as indicated in Figure 1 and may thenbe adjusted into the position indicated in Figure 2, by drawing, pushing, tapping or otherwise moving the strip across the jam nut R until the aperture U in the strip seats over the reduced end T of the jam nut. while at the same time the ends of the spring strip are adjusted under the edges of the cover hole. In Figure 6 the spring strip 0 is shown in different diametric positions across the cover hole andif desired the spring strip may be placed within the cover hole with both ends under the edges of the hole and then the strip may be moved bodily across the end of the jam nut R until the hole U in the strip falls over the reduced end T of the jam nut. Such method 1 tions indicated in Figure 6.

When the spring strip or clamp O is adjusted in final position as shown in Figure 2, the engagement between the reduced end T and the hole U centers the clamp with regard to the cover opening H and holds the parts together. After the cover J and set screw K are adjusted with the set screw against the clamp the parts are securely clamped in position. The spring strip 0 is preferably thicker than the depth of the reduced end T so that the pressure of the set screw K is against the stri and the set screw does not bear on the end By this means the s ring strip is held tight against the jam nut and prevents looseness in play in the assembled parts. a v

I claim:

1. In a compressor, a compressor head having a valve seat opening in its inner wall adapted to receive a valve seat carrying a valve, the outer wall of the head having a corresponding opening adapted to be closed by a cover carrying an adjustable valve securing device, a valve seat having a central member projecting outwardly towards the said cover opening when the valve is seated. and a removable valve holder in the form of a spring strip adapted to be adjusted over said projecting member on the valve seat with the ends of the strip beneath the edges of the cover opening for maintaining the valve seat in position in the valve seat opening until the cover and valve securing device are adjusted.

2. In a compressor, a compressor head having a valve seat opening in its inner wall adapted to receive a valve seat carrying a valve, the outer wall of the head having a corresponding opening adapted to be closed by a cover carrying an adjustable valve securing device, a valve seat having a central member formed with a reduced end projecting outwardly towards the said cover opening when the valve is seated, anda removable valve holder'in the form of a spring strip having a central aperture adapted to be adjusted over the reduced end of saidprojecting member on the valve seat with the ends of the strip beneath the ed s of the cover opening for maintainingan centering the valve seat in position in the valve seat opening until the cover and'valve securing wards the said cover openin when the valve' is seated, and a removable va ve holder in the form ofaspring strip adapted to be adjusted ing provided with engaging means formover said projecting member on the valve ing abutments for a tool, to enable the seat with the ends of the strip beneath the strip to be moved longitudinally for engage- 10 edges of the cover opening for maintaining ment and disengagement with the head. the valve seat in position in the valve seat In testimony whereof I have signed this opening until the cover and valve securing specification. device are adjusted, said spring strip be- CHESTER WV.METZGAR.