The working principle of pressure reducing valve

Pressure reducing valve is a kind of special device, reduce the working pressure pipeline automatically, it can be by high water pressure reducing valve before pipe to the valve pipe after the required level. Pressure reducing valve is widely used in high-rise buildings, the area of urban water supply pipe network pressure is too high, mines and other occasions, to ensure that each water point in water supply system water pressure and flow to have the appropriate services. In view of water leak rate and degree of waste almost as the water pressure is directly proportional to the size of feed water system, thus reducing valve have improve system operation condition and potential water-saving effect, according to statistics, the water-saving effect is about 30%.

The structure of the pressure reducing valve type many, common in the past have a spring in the diaphragm, piston, etc. Within the basic principle of the pressure reducing valve by valve port on the local resistance to reduce the water pressure, water pressure drop by connecting disc film or the scope of import and export pressure difference on both sides of the piston automatic adjustment. In recent years appeared some new type pressure reducing valve, such as constant ratio type pressure reducing valve, the construction principle as shown in figure 14.2 2. Constant ratio reduced pressure principle is to use the body of the floating piston hydraulic pressure ratio control, import and export side pressure ratio is inversely proportional to the import and export side piston area ratio. The pressure reducing valve work smoothly without vibration; The body without the spring, so no spring rust, metal fatigue failure were evident; Good sealing performance, leakage and therefore reduced pressure (water flow) and reduction of static pressure (flow to 0); Especially in relief at the same time does not affect the water flow.

 

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The effect of hose clamp

1, hose clamp application range

Light hose clamp used in 6 kinds of size series of ordinary mechanical pressure pipe, the pipe diameter 6-57 mm.

Double hose clamp used in five series of mechanical pressure pipe size, pipe diameter 6-42 mm.

Heavy series hose clamp used in eight kinds of series of high mechanical pressure pipe size, pipe diameter 8-273 - mm.

2, hose clamp material properties

Density, bending strength, impact toughness, compression strength, elastic modulus, tensile strength, heat resistance, good color

3, hose clamp installation program

Before assembly on the welded plate assembly, to better determine the direction of the clip, suggested in a fixed place ready first, after welding on welding, embedded in the lower part of the hose clamp body, put on the pipe should be fixed. Put the other half hose clamp body and cover plate, with a screw. Avoid direct welding has installed hose clamp plate.

With guide rail, rail welding in basis, or with screws, then push the guide screw nut in orbit, and 90 degrees, the second half of the hose clamp body embedded nut, put that need to be fixed on the tube, put up half of the tube clamp body and cover plate, screw fixation.

Folded assembly, based on the guide rail welding in, or with screws, first to pack up and down half of the hose clamp body, put that need to be fixed on the tube put up half of the hose clamp body, with the screw, through the locking plate prevent it from turning. Then install the second tube clip to the above method.

Bend pipe assembly, assembly bent pipe, shall be directly on the bend in the front and the rear insein hose clamp is fixed. Suggested that this should be a fixed position of supporting points.

The classification of the water hose clamp:

1. According to the shape, the whole round heavy hose clamp, the whole circle of light hose clamp, half-and-half type hose clamp, short head half-and-half type hose clamp, rotating hose clamp, rotary has felt hose clamp, J type hose clamp, etc. According to the classification of ningbo John lam electronics co., LTD.

2. According to the material, ABS plastic hose clamp, aluminum alloy hose clamp, stainless steel hose clamp, carbon steel hose clamp, etc. Common material classification according to the market.

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