The adjustment function is realized by an axial movement similar to a piston-like cylinder in the valve chamber, and its stroke is consistent with the direction of water flow in the tube. The water flows from the axial arc into the outer casing, and the flow passage in the piston valve is axisymmetric, and no turbulence occurs when the fluid flows. The change in the flow area is achieved by a linear motion of the piston along the axial direction of the pipe.
Regardless of the position of the piston, the water in the valve chamber moves to any position regardless of the position of the piston. The water flow section in any position in the valve chamber is annular, and the shaft is contracted at the outlet to achieve cavitation prevention. Cavitation that may be caused by throttling damage to the valve body and piping.
The piston valve body is designed as a whole, with high flow capacity, and the opening degree is linear with the flow rate, which can effectively avoid cavitation and vibration. The inner casing has a streamlined guide rib connected to the outer casing, and the stainless steel piston is reliably guided to slide to prevent tilting or poor running. The end face upstream of the inner casing is spherical, causing the water flow to form a gradual process, and the piston is operated by a crank link mounted in the casing. The piston valve is double-sealed with metal to metal and metal and rubber to achieve two-way bubble-level sealing. Therefore, the sealing system has a long service life and is tightly closed.
Due to the special structure of the piston valve, depending on the operating conditions, the over-water characteristic of the valve can be adjusted by the type of the outlet part of the downstream outlet of the valve (the outlet part can be replaced), so as to meet the requirements of different working conditions. The effect of the flow. There are four types of outlet-regulating components: * E-type, with a straightening of the cross section and a sudden enlargement of the cross section along the downstream end of the end seat, thereby eliminating cavitation damage. It is suitable for the occasions of controlled flow, high pressure difference and large back pressure, while the straightening and straightening of the cross section can reduce the cavitation effect. The second type S has a closed guide member with a slotted sleeve.
It is suitable for the occasions of controlling flow, adjusting the high pressure difference and sufficient back pressure. Its regulation is matched with the fluid state, which can achieve better results. The third type F has a short diffusing tube at the outlet of the valve body, and is suitable for adjustment and opening and closing occasions, and functions as a switch. The head loss is very small when opening and closing, and the resistance is small when fully opened. The fourth type of LH or SZ, the piston-closed guide member in the valve chamber is equipped with a porous ring net with anti-cavitation, suitable for adjustment, anti-cavitation, high pressure difference, small back pressure (at the inlet of the reservoir) Its control flow regulation characteristics and operating conditions require a good match to achieve the elimination of cavitation effects.
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