US2851051A - Pulp stock valve - Google Patents

Description

p 9, 1958 J. A. ENGLERT ETAI. 2,851,051

PULP STOCK VALVE- Filed Aug. 22, 1955 United v States Patent PULP STOCK VALVE Joseph A. Englert and Bill Kasey, Chicago, Ill., assignors to Crane Co., Chicago, 111., a corporation of Hlinois Application August 22, 1955, Serial No. 529,703

6 Claims. (Cl. 137-242) This invention relates generally to a gate valve, and,

more particularly it is concerned with the type of valve construction referred to by those skilled in the art as a pulp stock valve. V In order to acquire a better appreciation concerning the back-ground of this invention, it should be understood that heretofore in connection with valves of this type as generally exemplified in U. S. Patent No. 2,000,853, granted May 7, 1935, and shown on page 300 of No. 53 catalog issued by Crane Co., a principal objection has been the necessity for maintaining a relatively long extended joint around the lower portion and underside of the valve in which line fluid pressure frequently tended to break or else to disturb the joint causing subsequent leakage. Repairs being located on the underside of the valve were difficult to make in many instances due to lack of space below the pipe line.

An additional objection to the former types of valves used is the fact that the valve seat mounting, rather than the body itself, was subject to the closing thrust in the valve closing operation and as a result the joint at the base of the valve was subject to further undesirable high stresses.

It is therefore one of the more important objects of the present invention to provide a valve in which the troublesome extended joint of prior constructions is eliminated, and further to provide the type of structure in which the seat joint and mounting actually is exposed to line fluid pressure in such manner as to render it more eflicient.

A further object is to provide for a construction in which it is unnecessary to make repairs from beneath the valve in the event that inspection or such repair becomes necessary.

Another object is to provide for a combined seat and guide construction in a valve easing comprising a plurality of sections in which said sections actually are guided for alignment in such manner as to render welding, bolting or other forms of attachment of the said sections requiring great accuracy more convenient to perform.

A further object is to provide for a valve construction in which access openings are provided at either or both sidesof the valve casing and thereby expedite the rodding out of foreign matter and other line accumulations adjacent to the valve seat.

A still further object is to provide for the type of construction at the base of the valve casing in which it is relatively convenient to clean the valve seating surfaces by means of tools easily inserted through said access openings.

Other objects and advantages will become more readily apparent upon proceeding with the specification read in light of the accompanying drawings, in which Fig. 1 is an exterior perspective assembly View of a valve embodying our invention.

Fig. 2 is a magnified fragmentary sectional view of the novel seating arrangement.

Fig. 3 is an exterior perspective view of one section of the valve casing.

Patented Sept. 9, 1958 Fig. 4 is a perspective external view of a preferred form of removable seat section.

Similar reference numerals refer to similar parts throughout the several views.

Referring now to Fig. 2 in which there is shown in fragmentary section a valve seat construction embodying our invention. A valve casing generally designated 1 consists of the two axially aligned sections 2 and 3 having the respective end flanges 4 and 5 for attachment to a pipe line (not shown). Each of the sections is provided with a passage 6 and 7 respectively and each is provided at its lower end portion with the respective transversely extending projection at 8 and 9 arranged to join in abutting relation to form a line joint as at 10. It will be realized that the joint while being indicated as made by bolted means may be accomplished by brazing, soldering, welding, or other of the many numerous forms of providing a connection for fluid sealing sections.

It will also be apparent that each of the sections 2 and 3 at their adjoining ends 8 and 9 are provided with transversely extending slots or key-ways 11 and 12 respectively for receiving a substantially oblong seat insert'member generally designated 13 having a groove preferably of dovetail form to receive a soft contact insert such as the member 15 which may be made either of lead, rubber, or other compositions, depending upon the nature of the service for which the valve is intended.

In the latter connection, it will, of course, be appreciated that instead of employing an insert as at 15, the member 13, may be composed entirely of a soft resilient material capable of not only cooperating with a valve closure member as a stop or otherwise as hereinafter to be described, but it also serves as a gasket in effecting a fluid seal between the respective sections 2 and 3.

In the valve construction above described and illustrated, a knife-like form of closure member 16 is shown reciprocally movable to provide for control of fluid between the passages 6 and 7. The closure member at its lowermost end portion is provided with a knife edge 17.

To hold the sections 2 and 3 together as hereinafter.

referred to, the through bolts 18 extending through the apertures 19 are mounted as illustratedaround the side and lower portions of the assembled sections. a

The closure member on its downstream side contacts the surface 21 of the casing 2 in the closed position of the valve as shown.

As to the closure member actuating mechanism employed, it will be noted that the upper portion of each of casing sections 2 and 3 is provided with a yoke pad 20,

more clearly shown in Fig. 3 having tapped holes 22 to receive the positioning yoke studs 23 as shown in Fig. 1.

Attached to the latter and having complementary base pads for such mounting are a pair of yoke arms 24, 24

(see Fig. vl) bolted together as at 25 to form a journalling member 26 for the valve stem 27.

At the lower end portion of the stem, a bifurcated. connecting support member 28 for the carrying of the closure member 16 is attached by means of bolts 29 to the said closure member depending from the stem 27.

At the upper end portion of the stem, the usual handwheel 31 is mounted held in place on the stem by means of a handwheel nut 32.

For purpose of providing a fluid seal around the said closure member, a conventional stufling box, such as that shown in the above mentioned patent, is provided While only a single cover is shown, it should be realized that on the opposite side of the valve in Fig. 1, a similar cover is also provided which permits upon removal of both covers the displacement longitudinally of the seat insert or bar 13 either for replacement or repair and also the removal of objectionable accumulations of line materials. 1

It will further be appreciated that the type of fit between the member 13 and the grooves and 11 of each section is preferably made of'such dimensions so as to promote relatively close guiding for purpose of alignment of each of said sections together with their respective passages 6 and 7.

Further, it will be apparent from Fig. 2 that the shoulders of each section at 11 and 12 will carry the downward thrust load of the closure member 16 when the latter is in the closed position, and thus the body proper will absorb the full thrustdeveloped by the stem in the closing operation. This is in striking contrast to the employment of a plurality of studs as shown in the patent referred to.

It will of course be appreciated that the single embodishown and described is for purpose of illustration only and the invention therefore may take form in a plurality of forms without departure fiom the spirit of the invention as hereinafter defined.

We claim:

1. In a gate valve, a casing therefor, a closure member reciprocally movable within said casing, the said casing comprising a plurality of complementary sections having a substantially common fluid passage and grooved portions therebetween, the said closure member being positioned intermediate to said sections and intercepting said passage, transversely extending means for aligning said sections in the course of assembly, side disposed removable means spanning the said complementary sections to connect the latter members and to retain said transversely extending means against endwise movement relative to the casing, said transversely extending alignment means being interposed in said grooved portions between said sections so as to be longitudinally movable therein, and having a surface forming a stop for the said closure member in the closed position of the valve.

2. In a gate valve, a casing therefor, a plate-like clo sure reciprocally movable within said casing, the said casing comprising a pair of substantially aligned hollow sections, a combined seat and alignment member between said sections, the said latter member being predeterminately axially movable between the sectios, each of the said sections having oppositely disposed through recesses for receiving said combined seat and alignment member, oppositely disposed means extending over outer limits of said recesses and substantially abutting opposite ends of the said combined seat and alignment member to inhibit endwise movement of the latter member, and means for drawing up said sections around the said seat and alignment member.

3. In a pulp stock valve, the combination of a casing comprising a plurality of hollow sections in substantial alignment to form a common fluid passage therebetween, a reciprocable closure member predeterminately interrupting the said passage, each of said sections having a key-way portion between the said casing sections, a transversely movable seat fitted in said key-way portions so as to be predeterminately movable endwise in said portions, plate-like means joining said sections and spanning outer substantially vertical surfaces thereof to hold said seat against endwise movement, said plate-like joining means upon removal providing a clean-out for the said key-way and said sections.

4. In a pulp stock valve, the combination of a casing comprising a plurality of hollow sections in substantial alignment to form a common fluid passage therebetween, a reciprocally movable closure member predeterminately interrupting the said passage, cooperating slots in said sections providing a key-way between the said casing sections extending for the full width of said sections, a transversely movable bar fitted in said key-way so as to be longitudinally movable therein, cover means joining said sections and holding said bar against endwise movement, said cover means providing upon removal clean-out means for the said key-way and said sections from side portions of said sections.

5. In a gate valve, a casing therefor, a closure member reciprocally movable within said casing, the said casing comprising a plurality of complementary sections having a substantially common fluid passage and oppositely disposed transverse lower grooved portions, the said closure member being positioned intermediate to said secn'ons and intercepting said passage, an interposed member for aligning sections in the course of assembly, said latter member comprising an elongated stick-like member of polygonal cross-section interposed in the grooved portions between said sections so as to be longitudinally movable predeterminately in said grooved portions, and forming a stop for the said closure member in the closed position of the valve.

6. In a gate valve, a casing therefor, a plate like closure reciprocally movable within said casing, the said casing comprising a pair of substantially aligned hollow References Cited in the file of this patent UNITED STATES PATENTS 1,226,380 Riley May 15, 1917 1,308,154 Wones July 1, 1919 1,753,524 Mawby Apr. 18, 1930 2,000,853 Lange May 7, 1935 2,055,512 Wallace Sept. 29, 1936 FOREIGN PATENTS 1,102,145 France May 4, 1955

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