Cement warehouse roof ESP control parameters and principles of positive and negative pressure relief valve Positive and negative pressure relief valve is standard cement warehouse roof material cement silo systems essential equipment, it can release the inner feed cement silo too much pressure, but also can ease electric concrete mixer price negative pressure. If the feed cement silo and outside air pressure within the pressure difference reaches an irregular situation. Pressure relief valve will open automatically feed cement silo systems to ensure absolute security. After the pressure is back to normal, the valve will automatically recover. Play a security role in the system. When the system pressure exceeds the predetermined value, the release valve is opened, the system portion of the gas / fluid into the atmosphere / pipe outside, so that the system pressure does not exceed the allowable value, thereby ensuring no accidents occur due to excessive pressure. Pressure relief valve, also known as relief, or relief valve, but there are some differences between it and the pressure relief valve. Positive and negative pressure relief valve cement warehouse roof with parameters: Carbon steel body, valve diameter = 273mm The maximum volume of air 9.000m3 / h The maximum preset negative value - 0.002 bar; Maximum pressure 0.05 bar Weight: 9.5 kg Lightweight design, reducing overall dimensions, Easy to handle highly resistant to pressure interference Ease of installation and maintenance fast. Hopper discharge structure have any effect on cement silo  Cement silo structure china concrete mixer new names for companies includes a cabin and hopper. Front compartment body structure has been described, this is mainly explained hopper structure, because it is extremely important to cement silo application performance.     Reasonable shape of the hopper. Hopper and reasonably determine the shape and position of the discharge port, to prevent arching, prompting the resulting overall flow of decisive significance. Depending on the position and shape of the shape of the hopper and discharge port, it determines the ability of the material through the hopper. The mechanical properties of the material itself restricts the hopper structure, shape and size.     Hopper discharge port positions are usually center discharge, corners and side discharge. Because of the asymmetry of the latter two, the possibility of a small arch, but at the same angle of inclination larger height requirement hopper. Hopper inverted cone is usually from round to round, square to square, round to rectangular, or rectangular to rounded. Inverted cone shape under the mouth, often by ingredient inlet shape constraints, so that the two together, to facilitate unloading without arching.     In order to obtain an overall smooth flow, avoiding knot arch, there are various forms of hopper to choose from. Symmetric symmetrical on both sides of the material hopper to the middle squeeze, easy to knot arch twin shaft concrete mixer with air compressorobstruction. But easy to make, with respect to the asymmetric hopper, the smaller its length, the material used for good mobility.     Asymmetrical hopper opposite the former case, easy to knot arch, so the use of more. But the same angle, hopper length longer than symmetric persons.