* Plate FLANGE (Plate Flange, Flat Flange, Plain Flange)
* SLIP ON FLANGE (SORF SOFF FLANGE)
* WELDING NECK FLANGE (WNRF FLANGE)
* BLANK FLANGE (BLIND FLANGE, BLFF FLANGE, BLRF FLANGE)
* THREADED FLANGE (SCREWED FLANGE)
*BACKING RING FLANGE
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High pressure reciprocating pump pressure should generally be between 10MPa ~ 100MPa. It is a positive displacement pump, with the volume of the working chamber to periodically change the volume to achieve the purpose of conveying liquid; prime mover mechanical energy directly into the pump through the pressure of liquid; pump capacity depends only on the working chamber volume change and its value The number of changes in the unit of time, in theory, has nothing to do with the discharge pressure. Reciprocating pumps are cyclical changes in the volume of the working chamber by means of reciprocating motion of the piston in the working chamber of the cylinder (or by periodic elastic deformation of flexible elements in the working chamber, such as membranes and bellows). Structurally, the working chamber of the reciprocating pump is separated from the outside by a sealing device, and communicates with the pipeline through a pump valve (suction valve and discharge valve). The characteristics are summarized as follows: The instantaneous flow is pulsatile This is because in the reciprocating pump, the liquid medium is alternately inhaled and discharged, and the piston in the displacement process, its speed is constantly changing. In pumps with only one working chamber, the instantaneous flow rate of the pump varies not only over time but also over time. With the increase of the working chamber, the instantaneous flow rate of the pulse is getting smaller and smaller, and even in practical terms can be considered a steady flow. The average flow rate is constant. In theory, the pump flow depends only on the pump's main structural parameter n (reciprocation per minute), S (piston stroke), D (piston diameter), Z (piston number), regardless of discharge pressure, And with the transport medium temperature, viscosity and other physical and chemical properties. So pump flow is constant. The pump pressure depends on the pipe characteristics The discharge pressure of the reciprocating pump can not be limited by the pump itself, but depends on the pipe characteristics of the pump unit and is independent of the flow rate. That is, if the delivery liquid is considered to be incompressible, it is theoretically conceivable that the discharge pressure of the reciprocating pump is not subject to any limitation, and any desired discharge pressure of the pump can be established depending on the piping characteristics of the pump unit. Of course, all reciprocating pumps have a pump discharge pressure requirement, which does not mean that the pump discharge pressure will not increase any longer, but merely because of the prime mover rated power and the pump itself, the structural strength limits are not allowed Exceed this pressure of discharge use. Strong adaptability to conveying media In principle, reciprocating pumps can transport any medium with almost no restrictions on the physical and chemical properties of the medium. Of course, due to the fluid side of the material and manufacturing processes and sealing technology limitations, and sometimes also encounter can not adapt to the situation. Have good self-absorption performance. Reciprocating pump not only has good inhalation performance, but also good self-priming performance. Therefore, for most reciprocating pumps, it is usually not necessary to prime the pump before starting. Machine efficiency, energy saving. Qt = AsnZ Where Qt pump theoretical flow; A plunger (or piston) cross-sectional area; S stroke; n crankshaft speed (or plunger reciprocation per minute) Z Number of pistons or pistons Actual pump flow: Q = Qt-Q. Type Q pump flow; Qt pump theoretical flow; Q pump flow loss. Factors that contribute to pump flow loss include: volume loss due to liquid compression or expansion; volume loss due to valve lag due to closure; volume loss due to leakage through the sealing surface due to unsystematic valve closure; , Piston rod or piston ring leakage caused by the volume loss. Pump instantaneous flow Single-cylinder single-acting pump flow curve: Three-cylinder single-acting pump flow is single-cylinder single-acting pump flow in the three phases of the superposition of its curve is as follows: Pump power pump effective power: , The pump discharge of liquid from the pump is called the effective power. Ne = PQ where Ne effective power, P total pressure, Q flow. After substitution into the unit becomes: Ne (KW) = 1 / 36.7 × P (Kgf / cm2) × Q (m3 / h). Considering the power loss caused by transmission efficiency, mechanical friction, volumetric efficiency and medium temperature rise, N = 1 / (0.85-0.9) N for low pressure reciprocating pump when selecting the power of the prime mover. For high pressure reciprocating pump, N = 1 / (0.75-0.85) N. Reciprocating pump applications Reciprocating pumps are mainly used for high pressure and low flow, requiring a constant or constant flow pump, in proportion to the delivery of a variety of different media, or require inhalation performance, or require self-suction performance of the occasion. In the current energy-scarce world, reciprocating pumps, as energy-saving products, are widely used in many industries, such as energy mining, petroleum refining, food and drug processing. Such pump structure is more complex, strong supporting and poor versatility, variety and small batch.