JPH0819901B2 - Priming valve for chop-check pumps. - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to chop-check pumps, and more particularly to an improved chop-check pump for pumping highly viscous materials with or without fibrous components.

Prior art pumps for viscous materials have been disclosed that have a single plate fixed to the drive rod, such as the Gray Company Lincoln Pile Drive Pump Model 8361.
2 (the Lincoln Pile Drive Pump Model 83612), President Pump Models 205-831 and 206-620 (Pres
Idents Pumps Models 205-831 and 206-620) and the Pyles Industries, Inc.
Examples of suitable pumps include dual acting chop-check pumps.

An improvement over such pumps with a single plate has been achieved by pumps having two cooperating valve plates with holes or passages in one of the valve plates. Examples of known pumps with two valve plates include the Johnstone Pump Company (Johnstone Pump Company).
Company, Inc. Series 4 and The Aro Corporation, the assignee of the present invention, Models 650491 and 6
An example is the 50492 pump.

Another pump is disclosed in EP 0238380 which has a fixed plate and a slidable plate, the fixed plate having a passage therethrough.

Viewed from one aspect, the present invention is a chop-check type pump for viscous materials comprising a cylinder defining an axis, a drive rod axially movable within the cylinder, a priming valve mounted on one end of the drive rod for movement therewith, and a floating check valve mechanism cooperating with the cylinder at an outlet from the cylinder at an end of the cylinder where the drive rod enters the cylinder, the priming valve having an end valve plate secured to the drive rod, the end valve plate having flow passage means therein, and a sliding valve plate slidable on the drive rod between a position opposite the end valve plate and a position remote from the end valve plate. the sliding valve plate has a profile complementary to the cross-sectional profile of the cylinder, and the sliding valve plate has flow passage means which are open only when the end valve plate and the sliding valve plate are separated by movement of the drive rod in a first direction into the cylinder to engage the valve plate with the viscous material within the cylinder, and the flow passage means are arranged to block flow by engagement of the end valve plate and the sliding valve plate when the drive rod moves in a direction opposite to the first direction, thereby pumping fluid from the cylinder in response to movement of the sliding valve plate and the end valve plate.

SUMMARY OF THE INVENTION It is an object of the present invention to improve chop-check pumps for viscous materials so that they can provide improved penetration for heavy and concentrated materials.

Another object of the present invention is to increase the flow area and
To provide a pump check type pump with an improved priming valve for enhancing flow characteristics by providing a more direct path for material flow.

It is a further object of the present invention to provide a chop-check type pump with an improved priming valve which is comprised of a pair of cooperating plate members, each plate member having a flow passage therein.

It is yet another object of the present invention to provide a chop check type pump with an improved priming valve comprising a pair of plate members, each having a passage therethrough for viscous material, one member fixed to the end of a drive rod and the other plate member slidable on the drive rod, the plate members cooperating to impede the flow of viscous material between the plate members in the direction of movement of the drive rod and to permit the flow of viscous material between the plate members in the opposite direction of movement of the drive rod, the fixed plate member being shaped and positioned with an edge on its bottom to facilitate insertion of the priming valve into the viscous material.

It is a further object of the present invention to provide an improved priming valve for a chop-check type pump comprising a pair of plate members, one fixed to a drive rod and the other slidable on the drive rod toward and away from the fixed plate member, each plate member having a flow passage therethrough;
And the cross-sectional area of the flow passage in the slidable valve is slightly less than half the cross-sectional area of the slidable valve.

Other objects and advantages of the present invention are described below.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate preferred embodiments of the present invention,
In this regard, similar elements in different drawings are provided with similar reference numerals.

FIG. 1 is a partial detailed longitudinal section of a prior art chop-check pump having a priming valve with two plates, only one of which has a passage therethrough.

FIG. 2 is a partially cut-away elevational view of a chop-check pump according to one embodiment of the present invention, showing the priming valve closed during upstroke operation.

FIG. 3 is an elevational view similar to FIG. 2 showing the priming valve open during the downstroke operation of a chop-check pump.

FIG. 4 is a plan view of the slide valve plate of the chop check pump of FIGS. 2 and 3.

5 is a cross-sectional view of the sliding valve plate taken along line 5-5 of FIG.

FIG. 6 is a plan view of the end valve plate of the chop check valve of FIGS. 2 and 3.

FIG. 7 is a cross-sectional view of the end valve plate taken along line 7-7 of FIG.

FIG. 8 is a plan view of an end valve plate according to another embodiment.

9 is a plan view of an alternative embodiment sliding valve plate coupled to the end valve plate of FIG. 8. FIG.

FIG. 10 is a plan view of an end valve plate according to yet another embodiment.

11 is a plan view of an alternative embodiment sliding valve plate coupled to the end valve plate of FIG.

FIG. 12 is a plan view of an end valve plate according to yet another embodiment.

13 is a plan view of an alternative embodiment sliding valve plate coupled to the end valve plate of FIG. 12. FIG.

FIG. 14 is a plan view of a valve plate member according to yet another embodiment.

15 is a plan view of a sliding valve plate coupled to the end valve plate of FIG. 14. FIG.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a prior art chop check valve 100.
The valve 100 includes a cylinder or housing 101 containing a priming valve 102.
The priming valve 102 is made up of two valve plates 104 and 106.
has a flow opening 108 therethrough and
The valve plate 104 is supported on the end of the drive rod 110 against the valve plate 106 during the first position.
In a first position, the valve plate 106 is axially slidable thereon to obstruct flow through the flow opening 108, and in a second position, as shown in FIG. 1, the valve plate 106 is axially slidable thereon to permit flow of the viscous material through the flow opening 108. The viscous material flows through the opening 112 and past the valve seat 114.
and into the chamber 118 around the periphery of the floating check valve 116;
From there it is pumped to a desired location, such as a storage tank.

2 and 3, the chop check pump of the present invention is illustrated. The chop check pump 10 basically comprises a cylinder 12 having a piston 14 therein.
The piston 14 is driven by a drive rod 16 which is operatively connected to a motor 18 for similar axial movement within the cylinder 12.

The motor 18 may be an air motor having a flange 20 at its lower end. A spacer rod 22 connects the flange 20 of the air motor 18 to the cylinder 12.
An air motor 18 is connected to a suitable source of pressurized air, for example 150 psi, and is used to reciprocate a drive rod 16 which is connected at its upper end to the air motor.

The drive rod 16 consists of an upper rod 26, which is supported at its upper end against the air motor 18, and a lower rod 30. The upper rod 26 has an enlarged intermediate rod section 28
The lower rod 30 is connected at its upper end to the intermediate rod section 28 in any suitable manner.

The piston 14 comprises an annular piston 36 which holds the intermediate rod 28 of the drive rod 16. A packing 38 is
A valve face is provided between the piston 36 and the inner wall of the cylinder 12, providing a seal between the outside of the piston 36 and the inner wall of the cylinder 12. A flow passage 40 is provided between the inner wall of the piston 36 and the outside of the intermediate rod 28.
42 is formed on the intermediate rod section 28 and
2, the flow of material from chamber 48 to flow passage 40 is obstructed. When valve face 42 engages valve seat 44 on piston 36, as shown in FIG. 2, the flow of material from chamber 48 to flow passage 40 is obstructed. When valve face 42 engages valve seat 44 on piston 36, as shown in FIG.
When the flow passage is free from the chamber 48, material can pass from the chamber 48 into the flow passage.

It will be seen that the piston 36 is restricted for movement between the shoulder 49 on the lower end of the upper rod 26 and the valve face 42. The piston 36 has an area in the axial direction that is smaller than the distance between the shoulder 49 and the valve face 42.

An outlet 50 is provided in the side of the cylinder 12. Material pumped by the chop-check pump is directed through the outlet 50 to a suitable conduit for desired discharge.

A floating check valve 56 is mounted within the cylinder 12 adjacent a valve seat 58 to open and close a passageway through the valve seat 58. A sleeve 60 is supported on the cylinder 12 at the bottom of the chamber 48 and has a shoulder 62 to limit upward movement of the body of the floating check valve 56.

The priming valve 70 of the present invention is coupled to the lower rod 30. The priming valve 70 includes an end valve plate 74 coupled to the end of the lower rod 30, and a position (FIG. 2) where the end valve plate 74 engages the end valve plate 74.
and a slide valve plate 76 axially slidable on the lower rod 30 between a position 74 and a position spaced apart (FIG. 3).

The slide valve plate 76 is connected to the end valve plate 74
The sliding valve plate 76 has an outer diameter greater than that of the sliding valve plate 76. The contour of the sliding valve plate 76 is complementary to the inner contour of the cylinder wall to which it is connected. In this embodiment, the sliding valve plate 76 and the inner wall of the cylinder or housing are both cylindrical.

Both the end valve member 74 and the sliding valve member 76 are provided with flow openings to maximize the flow area for the flow of viscous material into the chamber 48, as will be described in more detail below in connection with Figures 4-7.

As best seen in FIGS. 4 and 5, the sliding valve plate 76 is a generally washer-like member having a
A throttle-shaped opening 77 is provided on the inside of the valve.
In this embodiment, there are three openings 77, each of which generally defines an elongated arcuate slot.
77 is rounded at the ends, and its sides are generally curved and parallel to one another.

The end valve plate 74 is constructed and arranged to have a sharp edge 80 on the bottom for penetrating the priming valve into and pumping viscous or sticky materials (see FIGS. 2, 3 and 7).
6. The end valve plate 74 has a bottom formed at the apex of converging flat surfaces 82, 84 which define the bottom of the end valve plate 74. Surface 82 directs material outwardly from the end valve plate 74, and surface 84 directs material inwardly toward the passage means within the end valve plate 74. The embodiment of FIG. 6 shows three openings 75, each having the general contour of an elongated arcuate slot. The three openings of the elongated arcuate slot
The total area of 75 is slightly less than half the total area of the three openings 77. The central opening of plates 74, 76 is
It receives the drive rod.

The openings 75 in the end valve plate 74 and the openings 77 in the sliding valve plate 76 are arranged such that the openings are closed when one of the plates 74 and 76 is adjacent to the other.
In other words, the pattern of slots or openings 75 and 77 is designed so that plates 74 and 76 overlap one another to provide a solid plate section. As previously mentioned, plates 74 and 76 engage one another during the upstroke or pumping stroke of the pump. Sliding plate 76, having a larger diameter or area than fixed plate or end plate 74, engages the sliding valve plate 76 during the downstroke or return stroke of the pump.
76. When separated by a limited distance defined by the area of the stop or shoulder 80 on the rod 30, the passages in the end plate 74 are effectively open for the flow of viscous material therethrough. Similarly, the passages in the slide valve plate 76 are also open or exposed for the flow of viscous material therethrough. In this manner, the plates 74 and 76 are separated by a limited distance defined by the area of the stop or shoulder 80 on the rod 30.
When plates 74 and 76 are separated, a continuous flow passage is defined by the plates. When plates 74 and 76 are not separated but overlap adjacent to one another, the openings through the plates are effectively closed.

The particular pattern or flow passages in plates 74 and 76 depend on the material to be pumped and can be varied based on various other requirements. The stroke or movement of slide plate 76 can also be varied based on the liquid to be pumped and other requirements.

The valve plate 74 is axially adjustably supported along the drive rod 30 by suitable means such as threaded bolts and shims or threaded connections between the end valve plate and the drive rod and a lock nut to hold the plate 74 in the adjusted position.
The distance between the valve plate 76 and the valve shaft 78 can be adjusted, thereby allowing the stroke or axial movement of the slide valve plate 76 to be adjusted.

8-15 show various valve plates with additional contours of slots or openings in the plates. Plates 174 and 176 (FIGS. 8 and 9)
Each of the plates 174 and 176 has a number of straight slots 175 and 177, each of which is approximately perpendicular to the radius in the corresponding quadrant. It should be noted that the plates 174 and 176 are fixed to the rod 30,
The pattern of slots formed in each of plates 174 and 176 in this manner ensures that the slots are aligned with rod 30.
The valve plates 174 and 176 are arranged generally equidistant radially from each other. This is made possible by the inability of the plates 174 and 176 to rotate relative to one another. The slots or openings 175 and 177 in the two plates 174 and 176 are radially offset or not aligned at all, as seen in plan view. During the upstroke, the valve plates 174 and 176 are adjacent to each other to prevent material from flowing through the slots or openings in the valve plates. During the downstroke, the valve plates 174 and 176 are separated to allow flow through the slots or openings 175 and 177.

10 and 11 each show an elongated arcuate slot 275
275 and 276. Due to the curved arrangement of slots 275 and 277, no particular radial orientation of one plate relative to the other needs to be maintained.

It should be noted that the area of flow through the passages or openings in plates 74, 76, 174, 176, 274, 276 relative to the area of the plates is slightly less than half the area of each plate.

12 and 13 show another embodiment of the valve plates, in which the plates are fixed to the drive rods so that the openings in each plate can be maintained in a predetermined radial orientation. Fixed valve plate 374 and slidable valve plate 376 have substantially identical openings 375 and 377 therein. The openings are in opposite quadrants and occupy the majority of the quadrants. The openings in one plate are inversely aligned to the openings in the other plate. Plates
374 and 376 can be secured to the drive rod by means of securing slots 378 and 379, respectively.

14 and 15 show another embodiment of a valve plate similar to the embodiment of FIGS. 12 and 13, in this example:
The openings in one plate are inversely aligned to the openings in the other plate.
It occupies about half of the area of 4. Similarly, opening 477
It occupies almost half the area of plate 476. Plates 474 and 476 are secured to the drive rods via securing slots 478 and 479, allowing the radial orientation of openings 475 and 477 to be maintained.

The fixed valve plate may have an outer diameter larger or smaller than that of the sliding valve plate, or the plate may have the outer diameter of Figs. 8 and 9, Figs. 10 and 11,
As shown in the embodiments of Figures 12-13 and 14-15, they may have approximately the same outer diameter.

In the embodiments of Figures 8, 10, 12 and 14, the bottom of the end valve plate is not shown, but advantageously has a circular sharp edge formed and positioned thereon similar to that shown in Figure 7.

As with the previously described embodiments, the areas of the flow passages or flow openings in plates 374, 376 and 474, 476 are slightly less than half the area of the respective plates.

The improved priming valve of the present invention allows for increased penetration into the viscous material and achieves improved flow through the priming valve. One important aspect contributing to improved performance is:
The bottom of the end valve plate is uniquely contoured. Another aspect of the improved priming valve for chop check valves is that the flow passages in both the end valve plate and the slide valve plate form a powerful flow passage. Yet another improved aspect is the design of the slide valve plate so that the area of the flow passage therethrough is slightly less than half the cross-sectional area of the slide valve plate.

While preferred embodiments of the present invention have been shown and described, various modifications and variations are possible without departing from the scope of the invention.
All such variations and embodiments within the spirit and scope of the present invention are described.

Claims (10)

[Claims] 1. A chop-check pump for viscous materials, comprising a cylinder (12) defining an axis and a drive rod (3) movable axially within the cylinder (2).
0), a priming valve mounted on one end of the drive rod (30) and movable with the drive rod (30), and a floating check valve mechanism (56) cooperating with the cylinder (12) at an outlet from the cylinder (12) at the end of the cylinder (12) where the drive rod (30) enters the cylinder (12), the priming valve being fixed to the drive rod (30) and having an end valve plate (74) at the end of the drive rod (30), the end valve plate (74) having flow passage means (75) therein;
a slide valve plate (76) slidable on the drive rod (30) between a position facing the end valve plate (74) and a position spaced apart from the end valve plate (74), the slide valve plate (76) having a contour complementary to a cross-sectional contour of the cylinder (12), the slide valve plate (76) having flow passage means (75, 77) which are opened only when the end valve plate (74) and the slide valve plate (76) are separated by movement of the drive rod (30) in a first direction toward the cylinder (12) and engagement between the valve plates (74, 76) and the viscous material is established within the cylinder (20); and
wherein when the drive rod (30) moves in a direction opposite to the first direction, thereby pumping fluid from the cylinder (12) in response to movement of the slide valve plate (76) and the end valve plate (74), the end valve plate (74) and the slide valve plate (76) engage to block flow. 2. A chop-check pump as claimed in claim 1, characterized in that the flow passage means (75) in the end valve plate (74) has a cross-sectional area equal to or slightly less than half the cross-sectional area of the flow passage means (77) in the slide valve plate (76). 3. A chop-check pump according to claim 1 or 2, characterized in that the flow passage means (77) in the slide valve plate (76) has an area slightly less than half the area in the slide valve plate (76). Claim 4: End valve plate (174, 274, 374, 474)
2. The chop check pump of claim 1, wherein the flow passage means (175, 275, 375, 475) in the slide valve plate (176, 276, 376, 476) and the flow passage means (177, 277, 377, 477) in the slide valve plate (176, 276, 376, 476) have an area slightly less than half the area of each plate. 5. The method of claim 1, wherein the bottom of the end valve plate (74) is shaped to facilitate downward movement of the priming valve into the viscous material.
5. A chop-check pump according to any one of claims 1 to 4. [Claim 6] A chop check type pump as described in any one of claims 1 to 5, characterized in that the bottom of the end valve plate (74) is shaped to facilitate movement of the priming valve into the viscous material and to allow the viscous material to pass through the passage means (75) and around the outer periphery of the end valve plate (74). [Claim 7] A chop check type pump as claimed in claim 5 or 6, characterized in that the end valve plate (74) has a sharp edge (80) formed on the bottom to facilitate downward movement of the priming valve into the viscous material. 8. A chop-check pump according to claim 1, wherein the flow passage means (77) in the slide valve plate (76) has at least one slot-like opening. 9. A chop-check pump according to claim 1, wherein the flow passage means in the end valve plate (74) comprises at least one slot-like opening (75). 10. The method of claim 1, wherein the sliding valve plate (76) has a radial dimension greater than the radial dimension of the end valve plate (74).
1. A chop check type pump according to any one of claims 1 to 1.