What Is a Fluid Valve?
A fluid valve is a valve that controls the flow of fluid by changing its cross-section or length. The throttle valve and the check valve can be combined in parallel to form a one-way throttle valve. Throttle valve and one-way throttle valve are simple flow control valves. In the fixed pump hydraulic system, the throttle valve and the relief valve cooperate to form three types of throttle speed regulation systems, that is, the throttle speed of the oil inlet System, oil return throttle control system and bypass throttle control system.
- The fluid valve does not have a negative flow feedback function, and cannot compensate for the speed instability caused by load changes. Generally, it is only used in situations where the load changes little or the speed stability is not high.
- Can be divided into two types of straight-through and angle according to the channel mode;
- According to the shape of the opening and closing parts, there are three types: needle, groove and window.
- 1. The electromagnetic tube is a non-welded one-piece stainless steel tube, which can withstand high pressure impact and high frequency operation without breaking;
- 2. The coil is resin sealed and waterproof, which can be placed outside the house;
- 3. Low power consumption, low temperature, can be continuously powered on;
- 4. The installation position can be intentional, but the horizontal installation life is longer;
- 5. Material of valve body: Forged brass PA plastic, cast bronze, Teflon die-cast aluminum alloy, stainless steel dewaxing casting, etc. to meet the needs of different liquids;
- 6, widely used: air, water, vacuum, natural gas, oil, chemicals, steam, inert gases, corrosive liquids, etc .;
- 1. Mechanical impurities in the oil or dirt such as colloid, asphalt, carbon residue precipitated due to oxidation accumulate in the throttle gap.
- 2. Because the polarized molecules are charged after the oil ages or is squeezed, and there is a potential difference on the metal surface of the fluid gap, the polarized molecules are adsorbed on the surface of the gap to form a solid boundary adsorption layer. The thickness of the adsorption layer is generally It is 5 ~ 8 microns, which affects the size of the fluid valve gap. When the above deposits and adsorbate grow to a certain thickness, they will be washed away by the liquid flow and then reattached to the valve port. In this way, the pulsation of the flow is formed.
- 3. When the pressure difference at the valve port is large, because the valve port temperature is high, the liquid is squeezed more, and the metal surface is more susceptible to friction to form a potential difference. Therefore, the blockage phenomenon is likely to occur when the pressure difference is large.
- 1. Select a thin-bladed orifice with a large hydraulic radius.
- 2. Precisely filter and replace oil regularly.
- 3. Reduce the pressure difference before and after the throttle appropriately.
- 4. Use a metal material with a small potential difference, choose an oil with good oxidation stability, and reduce the surface roughness of the orifice.