DE90670C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

Pressure reducing valves, primarily those which are set up to automatically change the output pressure, depending on the changing consumption of the regulated pressure medium, have a tendency, when the throttling organ takes up a new position, because of the living force of the moving body. to push the borrowed masses beyond the correct position. This causes exceeding of the correct position either a continued moving back _r supplied in long once adopted direction, up to the end position, or occasioned in seeking in the correct position, an oscillation until the final achievement of the correct position.

The first case, continuation of the movement in one or the other end position, occurs in the In general, when loaded with rigid weights, but also when exposed to water without dropwise inflow.

The second case, pendulum motion, occurs both with automatically acting water loads of the pressure reducer, as well as especially with (not automatically changing) pressure reducers with a constant load, regardless of whether it consists of liquid or rigid bodies.

Brakes are used to prevent or reduce such erroneous movements which consist of either cataracts, air buffers or similar organs that slow down movement. Such Brakes, which are connected to the moving parts of the valve, consist of Air containers or cylinders with pistons, their contents, either air or liquid, through adjustable openings must enter and exit before the valve can assume a new position can, or from equally adjustable constrictions in the connection between two ■ Water containers through which the stress material must pass before it can exert the new effect can, or finally from brake springs with adjustable pressure, which on a surface the moving parts slide. All these arrangements have the disadvantage that they influence the movement of the valve by means of friction, inhibition, or cataract action does not remain constant, but depends on it Condition of the rubbing surface, the smearing of the set openings, the seizure the piston, spring pressure and other causes.

The object of this invention is the attachment of brush-shaped elements as an escapement. Such an organ consists of a number of elastic elements, each of which is identical Acts in a manner and usually only to a small extent on the moving mechanism of the valve, but their overall effect can be considerable, especially when a device for adjustability of the action of the individual fibers or lamellae is taken.

The arrangement and mode of operation of such a brush can be seen from FIG. A pressure reducing valve is selected for air-shaped bodies which has some kind of device to automatically change the pressure of the outflowing air. The housing A contains a membrane M on which the actual discharge valve V hangs; this is at a certain load P _{1 of} the membrane M by opening and closing at consumption

Claims (2)

changes keep the pressure constant; Since, however, in apparatuses with an automatic pressure change, the inflow increases with increasing consumption, and should decrease with decreasing consumption, a balance beam is connected to the valve rod T, which forks in the middle. and in turn rests with its pivot in a fork-shaped bearing C. At the end of the balance beam facing away from the membrane, a weight P2 is attached, by means of which the load on the membrane can be changed. Above the pin C, the balance beam carries vertical scissors, which are connected at the top by a pin U; The pendulum weight P8 hangs on this pin U, which when the valve is opened, due to greater consumption and the associated lowering of the diaphragm towards the diaphragm side, when the valve is lifted, it hangs towards the opposite side. These changes of position are accompanied by pendulum movements, but generally also by the phenomenon that when the weight P3 is inclined to one side, the weight and the membrane together with the valve remain in their movement until the limit position is reached. To avoid this, is with the weight P3 respectively. a cutting edge s connected to its linkage, which is pulled back and forth via a brush B. The depth of penetration between the fibers is determined by the adjustable cheeks b of the brush holder (FIG. 2) and thus provides any desired sensitivity. The consequence of this action is that the progressive movement of the weight is broken down into a series of standstills and short movements, depending on whether the fibers release or inhibit the cutting edge. The material of the brush can be fibrous, i.e. of organic origin, or consist of resilient wires or lamellas, but finally the brush could also consist of a more homogeneous material, e.g. B. made of felt or rubber. The body can also have several cutting edges instead of one, or it can itself be a brush or an equivalent organ. Sponsorship τ claims: 1. Pressure reducer, characterized in that to avoid BEZW. To reduce the fluctuations in the load weight, a brake consisting of multiple brushes or lamellae is arranged, over which a cutting edge s connected to the oscillating weight slides. 2. Pressure reducer according to claim 1, wherein the depth of penetration of the cutting edge ..? in the brush can be regulated by adjustable guides. 1 sheet of drawings.