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Valve for regulating the pressurized flow of abrasives, in particular blast media

  • US 4,518,145 A
  • Filed: 09/28/1982
  • Issued: 05/21/1985
  • Est. Priority Date: 09/28/1982
  • Status: Expired due to Term
First Claim
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1. A valve for controlling flow from an outlet of a pressurized tank containing abrasive media to a remote point of discharge, comprising:

  • (a) a pinch tube housing of tubular formation defining a pinch tube chamber therein, said housing being formed open at both ends and having intermediate its ends transversely aligned portions having diametrically opposed side openings communicating with the chamber, said housing having one end adapted for connection to said outlet, the other end of the housing being adapted for discharge into a conduit that has a connection to a source of pressure fluid and leads to said discharge point;

    (b) a pinch tube within said chamber adapted to be constricted radially so as to at times regulate the media flow and at other times stop said flow completely, said side openings opening upon opposite sides of the pinch tube, each of said opposite sides being deformable radially inwardly of the tube independently of the other side;

    (c) first and second tube-constricting means within the housing disposed at opposite sides of the tube, said means being disposed within the pinch tube chamber between the side openings and the respective, opposite sides of the pinch tube in direct contact with said opposite sides of the pinch tube, each of said means being movable inside the pinch tube chamber independently of the other means in a direction transversely of the tube for constricting it radially;

    (d) plunger means extending into the housing through one of said side openings and engaging one of said tube-constricting means for shifting it in said direction; and

    (e) means extending through the other side opening engageable with the other tube-constricting means and operable from outside the housing for adjusting the position of said other means relative to said one means.

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