US3924657A - Remote-controlled valve, preferably for pneumatic sand blast units - Google Patents

Remote-controlled valve, preferably for pneumatic sand blast units Download PDF

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Publication number
US3924657A
US3924657A US351883A US35188373A US3924657A US 3924657 A US3924657 A US 3924657A US 351883 A US351883 A US 351883A US 35188373 A US35188373 A US 35188373A US 3924657 A US3924657 A US 3924657A
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United States
Prior art keywords
valve
piston
pressure
control chamber
chamber
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Expired - Lifetime
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US351883A
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English (en)
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Soeren Kristian Assersen
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated
    • Y10T137/87201—Common to plural valve motor chambers

Definitions

  • a valve for remotely controlling the supply of a pressurized media adapted for use in sand blastingunits, comprising a pair of opposed pistons having piston headsfacing a control chamber, the surface area of each piston head being greater than the corresponding surface at the opposite end of each piston, the opposite end of the first piston having a conical valve body facing a valve seat, the opposite end of the second piston facing a flexible diaphragm covering the end of a conduit.
  • This invention relates to a control valve for remote control of the supply of pressure media, preferably for use in sand blast units.
  • a typical sand blast unit consists of a sand receiver with compressed air and having an air input from a compressor, said unit provided with a device for mixing the air and the erosive medium, ordinarily sand, and a pressure hose, through which the mixture of air and sand is conveyed to a nozzle outlet activated by and supervised by an operator.
  • valve device directly acting at the nozzle is an unsatisfactory solution due to the fact that such a device would be worn out extremely fast and furthermore, produce a disturbing wave of high pressure air, which would force its way back into the sand reservoir in the receiver.
  • the objective of the present invention is to provide a control valve which performs the desired disconnection in a safe manner and without application of other controlling media than the pressure air already at hand.
  • the invention as described in the characterizing part of claim 1 provides a control valve having several functions, such as to cut off, to turn on and, if desired, to control one or more pressure media.
  • a further objective of the invention is to provide a valve of said type, and at the same time of a compact and simple design in order to fulfil requirements both as regards safety and low costs.
  • the axes of the pistons performing these functions may be arbitrarily placed and oriented, and the function of regulation of the pressure air supply can be obtained by adjusting the pressure of the valve controlling medium in the control chamber of the valve, said adjustment being attained by controlling the rate of flow of said medium from said chamber to the atmosphere.
  • controlling medium may pass through a pressure stabilizing accumulator before entering said control chamber in order to minimize any reaction from the regulated medium on to the regulating or controlling medium.
  • valve according to the invention is mainly to be used in connection with sand blast units, in which the valve is part of, and also controls, two pressure paths, respectively the pressure air inlet to the receiver from for example a compressor and the pressure air outlet from said receiver to the atmosphere; the valve turns on or cuts off the supply to the receiver and simultaneously cuts off or turns on respectively the emission of pressure air from the receiver to the atmosphere.
  • These simultaneous valve movements are controlled by the pressure in the control chamber, which pressure again is controlled by a button operated valve, preferably located at the nozzle, whereby the button operated valve acts as a dead mans control for the operator.
  • the valve casing has at one end an inlet for the compressor air into a first chamber, the entrance chamber, in which is placed one end of a valve piston of the form of a conical valve body which turns on or cuts off the air supply to the receiver dependent on the position of said valve piston.
  • a channel connects said entrance chamber with a second chamber, the control chamber, and thereby admits a pressure air flow to said control chamber, the amount of which flow can be regulated by adjusting a screw taking up a larger or smaller part of the channel cross section.
  • the end walls of said control chamber are formed by two piston heads, one of which is the head of the piston mentioned above, and the other piston head is part of a piston controlling the outlet from the receiver to the atmosphere.
  • the wall of the control chamber is provided with a bore which is connected through a pressure hose having a button operated valve.
  • the characteristic features of the two pistons are thatthe effective areas of the piston heads facing said control chamber are larger than the areas at the other end of these pistons so that the same static pressure at both ends of the pistons results in propelling the pistons from the control chamber which feature will be explained in detail in the following.
  • the other end of the piston controlling the receiver to atmosphere outlet abuts a flexible disc or diaphragm covering the end opening of a pipe leading into the receiver. When this piston moves in direction of the control chamber, the pressure in the receiver releases the diaphragm from the pipe opening, and pressure air flows into the atmosphere.
  • the flexible diaphragm is made of a material offering good resistance to erosion.
  • the entrance chamber in the bottom of the control valve may further be equipped with a drain cock for drainage of condensates.
  • FIG. 1 is a perspective view showing a sand blasting unit of known type equipped with a control valve according to the invention
  • FIG. 2 shows a longitudinal section of said control valve in Fig. 1.
  • the receiver is closed by a cover 2 placed in the lower part of the funnel.
  • Pressure air is supplied to the receiver 1 from for example a compressor through an inlet union 3, from which the air is led into the receiver above the sand surface through a pipe branch 4 and through a valve 5 and a pipe branch 6 into a pump chamber 7, located beneath the receiver.
  • the pressure air forces the sand flow downwards from the receiver 1 through an outlet union 8 into a pressure hose connected thereto (not shown) and further on to a sand blasting nozzle (not shown) for discharging.
  • the pump chamber 7 is provided with a device 9 for regulation of the sand flow from the receiver 1 abovev
  • the valve 5 is ordinarily turned on, but in case of clogging of the sand supply to the pump chamber 7 said valve may be turned to the cut off position, and a high overpressure is built up inside the receiver 1 compared to the pressure in the pump chamber 7, ordinarily sufficient to clean up obstructions in the flow path of the sand.
  • a control valve 10 In the pressure air conduit before the pipe branches 4 and 6 is inserted a control valve 10 according to the invention.
  • the valve 10 controls the turning on or cutting off of the pressure air flowing into the receiver 1 and to the sand pump chamber 7, and at the same time cuts off or turns on, respectively, the pressure equalizing pipe connection 11 from the receiver to the atmosphere.
  • This control valve 2 consists of a valve casing with a lower cylindrical casing part 12 and an upper cylindrical casing part 13.
  • the inlet union 3 is mounted on the side of the lower casing 12, the bottom of which consists of an end cover 14 supplied with a drain cock 15.
  • a valve piston 16 with one end formed as a conical valve body 17 is arranged axially movable in a cylindrical bore 18 in the casing 12. Sealing rings 19 prevent leaking through the space between the piston 16 and the bore 18.
  • an entrance chamber 20 Between the valve body 17 and the end cover 14 is located an entrance chamber 20, through the sidewall of which a connection to the inlet union 3 is provided.
  • a connection is established between the chamber 20 and an outlet chamber 21, situated between the chamber 20 and the bore 18, through an annular gap 22 between the valve body 17 and a matching valve seat 23.
  • the chamber 21 is connected to the receiver 1 through an outlet union 24 and the pipe branch 4 and to the pump chamber through the valve 5 and the pipe branch 6 as shown in Fig. l.
  • the valve piston 16 has at its upper end a piston head 25 having a larger diameter than that of the valve body 17, and in the control chamber 26 the piston head 25 is supplied with a suitable sealing ring 27. Said larger diameter results in a larger effective pressure area of the piston head 25 facing the control chamber 26 than that of the valve body 17 facing the entrance chamber 20.
  • another piston 28 is arranged within a bore 29 in the upper valve casing part 13, and sealed by a ring 30.
  • the head 31 of the piston 28 facing the control chamber 26 is supplied with an additional suitable sealing ring 32.
  • the other end of piston 28 abuts a flexible diaphragm 33, the periphery of which is fixed between a cover 34 and the upper casing 13.
  • the upper surface of the diaphragm 33 covers the end opening 35 of the pipe 1 1 and circumferentially placed holes 36 in the cover 34.
  • the piston head 31 facing the control chamber 26 has a larger pressure area than that in the opposite end of the piston 28 determined by the diameter of the opening 35.
  • Said opening 35 is connected through the pipe 11 to the receiver 1, whereas the holes 36 are leading to the atmosphere partly shielded by a bell-shaped plate 37.
  • a channel 38 provided with an adjusting screw 39 interconnects the entrance chamber 20 and the control chamber 26.
  • Said chamber 26 is equipped with a bore 40, leading to a threeway valve 41 (further details hereinafter) to which a pressure control hose (not shown) is connected; said hose has a button operated valve at the nozzle.
  • Said hose is extending parallel to and ordinarily fixed to the pressure hose leading to the discharge nozzle from the outlet union 8.
  • the button operated valve at the nozzle is so arranged that if the operator presses down slightly and constantly said button, the pressure air path out of the hose is closed, whereas by releasing the button the pressure air in the hose and hence also in the control chamber 26 is discharged to the atmosphere.
  • the three-way valve 41 is designed to connect the control chamber 26 to the control hose or to the atmosphere. The latter position resulting in immediate process stop.
  • a pressure controlled safety valve may be connected to the control chamber so that when the pressure in the control chamber exceeds a predetermined level, said safety valve opens to the atmosphere and thereby stops the process as described above.
  • a valve for remotely controlling the supply of a pressure media to a receiver comprising:
  • valve casing containing a control chamber vented to the atmosphere via a bore
  • first piston and a second piston each contained within the valve casing, each having a piston head facing the control chamber, each piston head hava flexible diaphragm positioned between said pipe and said second piston opposite end.
  • first piston opposite end further comprises a conical valve body adapted to sealingly engage a valve seat positioned between said pressure entrance chamber and said pressure outlet chamber for preventing said pressure media from entering said receiver.
  • a valve according to claim 1 wherein the periphery of said flexible diaphragm is fixed between said cover and said valve casing and a central portion of said flexible diaphragm is urged to abut and seal said pipe by said second piston opposite end.
  • a valve according to claim 1 further comprising a three-way valve connected to said control chamber via said bore, said three-way valve adapteed to be in a first position connected directly to the surrounding atmosphere, in a second position connected to a hose with a controlling button valve and in a third position connected to a pressure controlled safety valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)
  • Multiple-Way Valves (AREA)
  • Lift Valve (AREA)
  • Nozzles (AREA)
US351883A 1972-04-20 1973-04-17 Remote-controlled valve, preferably for pneumatic sand blast units Expired - Lifetime US3924657A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK193972 1972-04-20

Publications (2)

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USB351883I5 USB351883I5 (show.php) 1975-01-28
US3924657A true US3924657A (en) 1975-12-09

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ID=8109049

Family Applications (1)

Application Number Title Priority Date Filing Date
US351883A Expired - Lifetime US3924657A (en) 1972-04-20 1973-04-17 Remote-controlled valve, preferably for pneumatic sand blast units

Country Status (13)

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US (1) US3924657A (show.php)
BE (1) BE798457A (show.php)
CA (1) CA985256A (show.php)
DE (1) DE2318995C2 (show.php)
FI (1) FI59944C (show.php)
FR (1) FR2181397A5 (show.php)
GB (1) GB1415568A (show.php)
IE (1) IE39413B1 (show.php)
IT (1) IT983992B (show.php)
LU (1) LU67475A1 (show.php)
NL (1) NL176917C (show.php)
NO (1) NO145266C (show.php)
SE (1) SE396646B (show.php)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735021A (en) * 1986-05-12 1988-04-05 A.L.C. Co., Inc. Abrasive blasting system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136539A (en) * 1983-03-15 1984-09-19 David Trevor Billows Valve for use in blast cleaning apparatus
GB2230485B (en) * 1989-04-14 1993-02-17 Rhoderick Jonathan Spenc Baker Pressurized blasting machine
DE8908884U1 (de) * 1989-07-21 1989-09-28 Druckluft- und Vakuumtechnik Ing. Heinz Kieß GmbH & Co KG, 4330 Mülheim Dosierventil für ein Gerät zum Abstrahlen von Werkstücken, Bauwerkteilen u. dgl. mittels eines mit einem körnigen Strahlmittel beladenen Trägerluftstromes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583185A (en) * 1945-05-22 1952-01-22 William Carls Rapid operating poppet air valve
US2984218A (en) * 1958-07-29 1961-05-16 Gen Electric Fluid pressure modulating servo valve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US709448A (en) * 1901-08-05 1902-09-16 Joseph Shaver Sand-blast-controlling apparatus.
US2553625A (en) * 1950-05-13 1951-05-22 Empire Blast Machine Company Sand blast
US3201901A (en) * 1963-09-30 1965-08-24 Alfred M Pauli Abrasive blasting equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583185A (en) * 1945-05-22 1952-01-22 William Carls Rapid operating poppet air valve
US2984218A (en) * 1958-07-29 1961-05-16 Gen Electric Fluid pressure modulating servo valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735021A (en) * 1986-05-12 1988-04-05 A.L.C. Co., Inc. Abrasive blasting system

Also Published As

Publication number Publication date
NO145266C (no) 1982-02-17
FI59944C (fi) 1981-11-10
GB1415568A (en) 1975-11-26
CA985256A (en) 1976-03-09
FR2181397A5 (show.php) 1973-11-30
DE2318995C2 (de) 1987-01-22
USB351883I5 (show.php) 1975-01-28
IT983992B (it) 1974-11-11
NO145266B (no) 1981-11-09
IE39413B1 (en) 1978-10-11
NL176917C (nl) 1985-07-01
BE798457A (nl) 1973-10-19
LU67475A1 (show.php) 1973-07-06
NL7305615A (show.php) 1973-10-23
FI59944B (fi) 1981-07-31
DE2318995A1 (de) 1973-10-31
IE39413L (en) 1973-10-20
SE396646B (sv) 1977-09-26

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