Flow-limiting orifice plate integrated orifice plate round missing orifice plate eccentric orifice plate

> b
bThe restriction orifice plate is also called the restriction orifice plate, the restriction orifice plate flowmeter, the restriction orifice plate flowmeter. The flow-limiting orifice plate is mainly used to reduce pressure and restrict flow during fluid transportation. There is no need to detect differential pressure signals like a standard orifice plate. It just takes advantage of the large pressure loss of the orifice plate to achieve the purpose of reducing pressure and limiting flow. <
r > b
b The flow-limiting orifice plate can be divided into two types: single-stage flow-limiting orifice plate (single plate and multi-stage flow-limiting orifice plate (multi-plate combination)). There are two kinds of multi-stage flow-limiting orifice plates, single-hole and multi-hole. It is also called flow-limiting orifice plate group. It can be divided into single-hole orifice plate group and multi-hole orifice plate group. Its structure and installation are similar to standard orifice plates. General applications In order to consider the processing cost, single-stage single-hole orifice plates are often used to achieve the purpose of limiting flow and reducing pressure. When the pressure drop is required to be greater than
b
b, multi-stage single-hole flow-limiting orifice plates are selected. .<
r > b
r > b <
r > b Main features<
r > b
b Simple structure, durable and reliable work.<
r > b
bUsing a flow-limiting orifice plate can replace a regulating valve to limit flow or reduce pressure, greatly reducing investment and operation and maintenance costs. <
r > b
b No need to measure pressure There is no differential pressure transmitter, flow totalizer and other electronic accessories, and the price is lower than the standard orifice plate of the same caliber. <
r > b
b Under the condition that the inner diameter of the pipe is certain, the throat opening The smaller it is, the higher the flow rate and the more obvious the pressure reduction and flow limiting effect.<
r > b2 Main technical parameters
b <
r > b
bNominal pressure
b
b
b <
r > b
bNominal diameter
b
b～
b <
r > b
b Each orifice plate can reduce the pressure
b
b by about
b,
b Multi-stage pressure reduction can be used, and the overall pressure reduction capacity is not Restriction.<
r > b Working principle of three-limit orifice plate<
r > b
b The flow-limiting orifice plate is a concentric sharp orifice plate used to limit the flow of fluid or reduce the flow of fluid. pressure. When the fluid passes through the orifice plate, a pressure drop will occur, and the flow rate through the orifice plate will increase as the pressure drop increases. But when the pressure drop exceeds a certain value, that is, exceeds the critical pressure drop, no matter how the outlet pressure decreases, The flow rate will maintain a certain value without increasing. The flow-limiting orifice plate is based on this principle to limit the flow of fluid or reduce the pressure of the fluid. <
r > b
b The flow-limiting orifice plate serves as a throttle. The flow element has the advantages of simple structure, easy processing, low manufacturing cost and convenient installation. On the premise of meeting the process requirements, using a flow-limiting orifice plate instead of a regulating valve to limit the flow or reduce the pressure will greatly reduce investment and operation and maintenance costs. , so it has been widely used in process equipment abroad and plays an important role in the safe operation of the equipment.<
r > b Scope of use<
r > b
b Restriction hole Plates can be used to restrict the flow of fluids or reduce the pressure of fluids. The flow-limiting orifice plate does not require real flow calibration. Suitable for <
r > b
b (
b
b Process materials need to be depressurized and the accuracy requirements are not high.<
r > b
b (
b
b When a large pressure drop is required upstream and downstream of the valve in the pipeline, in order to reduce the erosion of the valve by the fluid, when throttling through the orifice plate does not produce a gas phase, the valve can be upstream of the valve. Series orifice plate.
r > b
b (
b
b Where the fluid requires a small flow rate and continuous flow, such as the flushing pipe of the pump and the bypass pipe of the hot standby pump (Low flow protection pipeline analysis sampling pipe and other places.
r > b
b (
b
b Places where pressure reduction is required to reduce noise or wear, such as venting systems. <
r > bStructural form<
r > b
bFlow-limiting orifice plate is divided into single-orifice plate and multi-orifice plate according to the number of holes on the orifice plate. It can be divided into single-stage according to the number of plates. And multi-stage. When designing the system, the customer needs to provide parameters such as temperature, flow, caliber, pressure in front of the medium plate, pressure behind the plate, etc. If not specified, it should be designed as a single-stage single-hole orifice plate.<