Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K27/00—Construction of housing; Use of materials therefor
  • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves

Definitions

• shut-off and control valves such as, for example, wedge valves and similar types of valve
• a hand wheel and manually operated.
• the valves are often located in an environment where, after some time, they become heavily coated with contaminants on their outside.
• the valves and their hand wheels are often more or less totally caked with or buried in contaminating particles which, apart from making the operation of the valves more difficult to the operators, can also cause corrosion and damage to valve spindles and bearings.
• the object of the present invention is to provide a protective hood which is light, inexpensive, simple to fit and remove, has a repelling effect on contaminating solid particles falling down on it and requires little space for transport and storing. This has been obtained by giving the protective hood the characteristics set forth in the accompanying Claims.
• Fig. 1 in the drawing shows a side elevation of a protective hood fitted over a wedge valve shown partly in side elevation and partly by outlines.
• Fig. 2 is a perspective sketch of the hood in the expanded position and fig. 3 a perspective sketch of same when compressed for transport or storage.
• the numeral 1 designates a hood in accordance with the invention, 2 is a valve fitted with a hand wheel 3 with spokes 4, a nut 5 for retaining the hand wheel, and a valve spindle 6.
• the hood 1 is made from a fabric 7, which is suitably heat resistant and can, for example, be a glass fibre fabric.
• the fabric should be dense enough to give efficient protection against penetration of contaminating solid particles but should be permeable to rising air streams produced inside the hood in cases where hot media are transported in the conduit on which the valve is fitted.
• the hood is made in the form of a cylinder, open at one end and fitted, at the other end, with an end wall 8 with a central opening 9.
• the fabric of the hood is tensioned over a frame consisting of metal wire 10 wound to helical spring shape, to which the fabric is fastened at suitable points, e.g. by sewing the fabric around the wire, the spring action keeping the hood expanded in the axial direction.
• the hood is fitted with four rods 11, arranged like the spokes of a wheel and interconnected by a ring 12 defining the central opening of the end wall, to which ring the fabric of the end wall is fastened.
• the rods 11 are fitted with two fork-shaped clamps 13 intended to be passed over the spokes 4 of the hand wheel.
• the hoods in accordance with the invention are suitably made in a number of different sizes corresponding to different standard sizes of valves and their hand wheels. Since the frame is made in the form of a helical spring, the hoods can, for transport and storage, be compressed in the way shown in fig. 3 and can then suitably be kept in this position either direct by their packaging or, for example, by a pair of clamps 14 or similar. In this way the hoods require a minimum of transport and storage space, which is of great importance within process industries where large numbers of hoods may be needed.
• a hood When a hood is to be fitted over a valve, the helical spring of the frame is released, so that the hood is expanded to its full length, whereupon the hood is fastened by passing the clamps 13 over the spokes 4 of the hand wheel of the valve. It is suitable to have the size of the hood in the axial direction so adjusted that the bottom edge of the hood will seal - under light spring pressure - against the projecting flange 15 of the valve housing or a corresponding surface.
• a valve spindle 6 can be passed through the central opening 9 of the hood.
• the ring 12 defining the central opening seals against the hand wheel nut 5 or a corresponding part, depending on the type of valve.
• the fabric of the hood is permeable to gas, the outside of the hood will to a considerable extent be self-cleaning in the many cases where hot media are transported in the conduits and the heat from these media causes rising currents of air inside the hood.
• the permeable hood will also function as a protection against bodily injuries caused by jets of steam or other hot media escaping from the valve, since the hood will act as a brake and spreader and, at the same time, is less inclined to be thrown off the valve due to the pressure than is a completely impermeable hood.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Handcart (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20332568

Family Applications (1)

Country Status (3)

Family Cites Families (7)

• 1977
  • 1977-10-13 SE SE7711564A patent/SE403824B/sv not_active IP Right Cessation
• 1978
  • 1978-10-10 WO PCT/SE1978/000057 patent/WO1979000204A1/en unknown
• 1979
  • 1979-04-24 EP EP19780900158 patent/EP0006929A1/en not_active Withdrawn

Non-Patent Citations (1)

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