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AssigneeWIBAU (Westdeutsche Industrie- und Strassenbau-Maschinen Gesellschaft m.b.H.)
InventorHorst Bender
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The present valve is especially adapted for use in conduits through which construction mixtures, such as concrete mixtures, flow. The valve cooperates with a pump having pistons in two respective pump cylinders. A valve housing forms a valve piston chamber having plane walls. The valve plug or piston has also plane walls to fit into the valve chamber with respective plane walls. Three pairs of ports are provided. One pair is connected to the pump cylinders. Another pair is connected to a discharge conduit and a third pair is connected to a supply container for the concrete mix. Preferably, the cross sectional shape of the valve chamber and of the piston plug is triangular. However, the cross sectional shape may also form a quadrangle. Providing the valve chamber and the valve plug piston with plane walls facilitates the manufacture of the valve and improves its sealing characteristics.
A valving apparatus for interconnecting a double piston pump having two cylinders with conveying conduit means and with supply means comprising a valve housing having a given length, said housing further having a first pair of aligned ports for connecting said valve housing to said two pump cylinders, a second pair of aligned ports for connecting the valve housing to conveying conduit means, and a third pair of aligned ports for connecting the valve housing to said supply means, said ports being aligned at a pair of planes extending transverse to the longitudinal axis of said housing with each port of each pair of ports being aligned with a separate one of said planes, a piston valve plug mounted solely for axial movement in said valve housing, said piston valve plug having a central plug section with a cylindrical central passageway extending through the valve plug and the valve housing in a direction to interconnect ports of said first and second pair in a common plane, a first outer plug section with a first outer bent cylindrical passageway and a second outer plug section with a second outer bent cylindrical passageway, said first and second outer plug sections and said central plug section having together a length shorter than the length of the valve housing to permit the axial displacement of the piston valve plug in said housing, said first and second outer plug sections extending on each side of said central plug section, each of said first and second bent outer passageways including an angle within the range of about 75.degree. to less than 90.degree. in a direction to interconnect ports of said first and third pairs of ports in a common plane, said passageways being axially spaced, whereby in one axial position, said central passageway interconnects one port of said first pair with one port of said second pair, while one of said outer bent passageways interconnects the other of said first pair with one of said second pair, and whereby in another axial position said central passageway interconnects the other ports of said first and second pairs, while the other of said outer passageways interconnects said one of said first pair of ports with the other of said third pair of ports, and means operatively connected to said valve plug for axially moving said valve plug in said valve housing so as to be compatible with the function of suction, pressure and suction in that order for each work cycle of the valve, wherein said valve housing comprises plane walls defining a plug chamber, said piston valve plug also having plane walls fitting into said plug chamber, and wherein at least two of said plane walls of said plug chamber and at least two respective plane walls of said piston valve plug respectively include an angle of up to 75.degree..
Dependencies are inferred from the claim text.
A common distribution member forming a single discharge distributor for a plurality of pumping chambers: and having a slidable movement
Multi-way valve unit: reciprocating valve unit
Positive-displacement machines for liquids
Technical subjects covered by former us classification
Term ended 6 Sep 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a reciprocating valve for double piston concrete pumps. The purpose of such valves is to control the operation of the pump to convey a concrete mix from a supply container into a conveying conduit. The two pump cylinders are arranged in parallel to each other and the housing of the valve control mechanism extends substantially at a right angle to the longitudinal extension of the two pump cylinders. The housing of the valve interconnects the two pump cylinders. Suction ports are connected to the supply container and to the pump and discharge ports are connected to the conveying conduit which, for example, may have a Y-configuration at its valve connected end.
My U.S. Pat. No. 3,889,713 granted on June 17, 1975 describes a reciprocating valve of the above type which has a cylindrical valve housing in which the piston plug operates with the function of "suction-pressure-suction" in that order.
The valve of my above U.S. Patent has several advantages. One advantage is seen in the very short displacement of the valve plug piston. Another advantage is seen in the fact that the suction cross sectional areas from the supply container extend directly through the valve plug piston, whereby sharp bends can be avoided and the concrete mix can flow through passageways having gentle bends of about 75.degree..
In order that the invention may be clearly understood, it will now be described, by way of example, with reference to the accompanying drawings, wherein:
FIG. 1 is a top plan view of the valve according to the invention with the top wall of the valve housing removed;
FIG. 2 is a sectional view through the valve according to the invention along the section line A-B in FIG. 1;
The top plan view of FIG. 1 shows the general arrangement of the parts relative to each other. A prism valve plug 11 is located in a valve housing 1. The valve plug piston 11 comprises three sections, namely, a central section 10 flanked by two outer sections 9 and 9'. Two pump cylinders 12 and 12' are connected to the valve housing 1 and a conveying conduit 15 is connected to the respective ports in the valve housing through a Y-conduit member having legs 13 and 14. The valve plug piston 11 is movable back and forth by means of a plunger 8 and the direction of flow is indicated by the arrowheads.
The valve housing 1 comprises three walls 2, 3, and 4 as best seen in FIG. 3, whereby the connection from wall to wall may be accomplished through outwardly bent flanges 4' and/or by respective moldings 4". This feature of the invention makes it possible to easily assemble and disassemble the valve housing and to replace any sealing means or entire walls if necessary. The end faces of the housing 1 are closed by covers 5 and 5'. To facilitate the connection between the longitudinal walls of the valve housing and the covers 5, 5' the walls or the covers may be provided with respective flanges 6 through which screws or the like would extend.
The cross sectional shape of the housing is easily determined by the cross sectional configuration of the molding 4" and by the size of the top covering wall 4, as well as by the flanges 4' of the top covering wall 4. As mentioned, the top housing wall 3 may be connected to the covers 5 and 5', as well as to the housing walls 2 and 3.
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