K - O
Capillary Soldering housing end prepared for pipe connection by soft soldering or brazing. Category I, II, III IV The Pressure Equipment Directive PED is divided into 4 categories. Decisive for the classification is the hazard potential of the component to be classified. This results from the maximum permissible pressure, the relevant volume or nominal diameter and the group of fluids for which the component is intended. Cavitation Cavitation is a two-step process in a fluid stream. The first step involves the formation of vapor bubbles in the liquid stream as a result of a drop in static pressure below the vapor pressure of the liquid. The second step of the process is the subsequent collapse of the vapor bubbles, which condense back to liquid as the static pressure becomes greater than the vapor pressure of the liquid. Wedge gate valves Gate valves with wedge-shaped shut-off fittings, but not designed as a compact closing body as with the slide valve, but dissolved in two plates with an internal gear (only a ball as an intermediate link or a lever device). It is thus ensured the two-sided contact pressure of the closure body, a high sealing effect is so accessible. Also excluded is an otherwise possibly possible pinching of the closure body; The plates lift off at the beginning of the opening of the sealing surfaces, but are not fixed in intermediate positions. Flap A valve with a circular housing and a rotating disc as a throttle body attached to the shaft. Flap and eccentric rotary valve Valve with a closing body, which rotates about an axis transverse to the flow and which is flowed around in the open position. NOTE: This definition also applies to diaphragm backflow preventer. Ball, pressure-relieved Valves require the maximum opening force compared to other valves (shut-off force x differential pressure). To reduce this force, various special constructions have been developed. These are valve versions with a pre-stroke cone or with the differential piston principle. Thus, even larger pressure differences with pneumatic drive can be controlled. Lug Type Housing Threaded or through-hole housing for screwing adjacent flanges to the tubing. Cuff Replaceable part made of plastomer and / or elastomer, which protects the pressure-bearing housing from the flow medium and contains the seat in the housing. Maximum stroke For valves with mechanical limit stops, the entire stroke of the closing body between these mechanical end stops. NOTE: The mechanical limit stops can be located in the case, top or lid, actuator, etc. Reusable housing Housing with more than two housing end openings. Diaphragm fitting Valve in which the flow channel through the valve is changed by deforming a flexible closure body. NOTE: This definition also applies to Diaphragm Back-Flow Preventer Diaphragm Seal Part which, by means of a diaphragm, seals the passage of the actuator through the pressure-bearing housing. Diaphragm Valve A valve in which a flexible throttle body keeps the fluid away from the actuation mechanism and seals against the atmosphere. Mixer fitting A fitting in which the ratio of two or more input streams is influenced by changing the position of the closure body to obtain a common output flow. Piggable Valve A free flow type fitting for a theoretical ball with a diameter not smaller than the nominal inner diameter of the end of the housing. NOTE: The nominal inner diameter of the end of the housing of each fitting type is specified in the relevant product standard or suitability for use No housing end flange is suitable for mounting on adjacent pipe flanges with screws. NOTE: It may be suitable for shutting off the end of a pipeline and allowing disassembly of the downstream pipeline. Nominal flow coefficient EN 60534 1 The value of the flow coefficient at nominal stroke. Nominal stroke EN 60534 1 The path of the throttle body, measured from the "closed" position to the specified "open" position. Upper part Part of the pressure-bearing housing, which closes an opening in the housing and contains the opening for passage of the actuating member. Upper part Flange Flange on the upper part with which the upper part is screwed in or on the housing. Upper part with union nut upper part, which is connected with a union nut with the housing. Shell Screws that connect the shell to the shell.
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