Germany VAG valve company's RKV, RKVRIKO piston flow control valve. Piston Flow Regulators Unlike butterfly and gate valves, which are used only for pipeline shut-off, piston valves are valves that fulfill a variety of special regulatory requirements. The adjustment function is based on a piston-like cylinder in the valve cavity for axial movement to achieve its stroke and the direction of the water flow is consistent. Flow from the axial arc into the shell, piston valve spool for the axis of symmetry, the fluid flow does not produce turbulence. The change of the area of ​​the flow passage is achieved by a piston moving linearly along the pipe axis. No matter where the piston is, the water in the valve chamber no matter the piston moves to any position, regardless of the location of the valve cavity of the flow cross-section are annular, at the exit to the axis of contraction, so as to achieve the best anti-cavitation, to avoid Cavitation that may occur due to throttling damages valves and pipes. Piston valve body designed as a whole, with high flow capacity, opening and flow into a linear relationship, can effectively avoid cavitation and vibration. The inner shell has a streamlined guide rib connected with the shell, the stainless steel piston is guided reliably and slides to prevent tilting or poor running. The upstream face of the inner shell is spherical, forming a gradual change of water flow. The piston is operated by a crank rod mounted in the shell. Piston valve metal and metal and rubber double seal, to achieve two-way bubble-level seal. So to achieve long life sealing system, close tight. Due to the special structure of the piston valve, the valve's water-passing characteristics can be adjusted by the type of the outlet part of the outlet of the valve (replaceable outlet part) according to the operating conditions so as to meet the requirements of different working conditions and achieve the best The transfer effect. There are four types of outlet-regulated components: The first E-type, with straight straightening and sudden enlargement of the structure along the downstream cross-section, eliminates cavitation damage. For flow control, high pressure, back pressure large occasions, and cut straight, cross-section suddenly enlarged structure can reduce the cavitation effect. The second S-type, with its closed guide part having a slotted sleeve. For flow control, high pressure differential adjustment and sufficient back pressure large occasions, its regulation and fluid state match, you can achieve better results. The third F-type, the body part of the outlet has a short diffuser effect, suitable for regulating and opening and closing occasions, play the role of switch. Opening and closing head loss is very small, fully open when the resistance is small. The fourth type of LH or SZ, the piston-closed guide element in the valve chamber is fitted with a porous ring with cavitation protection for adjustment, cavitation prevention, high differential pressure, small backpressure (reservoir inlet) , It's flow control features and operating conditions require the best match, so as to achieve the elimination of cavitation effect. VAG piston valve can be used as a relief valve and explosion-proof pipe valve in the water diversion, VAG piston valve LH type, E type can be used as a liquid level or pressure regulating valve during storage, VAG piston valve LH, S type Can be used as a flow control valve, type E, LH or SZ can be used as a drain valve or pipe filling valve, sewage, water treatment VAG piston valve can be used as a pump start protection valve, or with special regulating outlet components , Can also be used in water treatment plant flow control valve, E-type piston valve can also be used as a sewage treatment plant gas control valve on the water VAG piston valve according to liquid conditions using different outlet components for pressure / flow control Valves, such as pipe network pressure balance.
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