DANFOSS solenoid EVR15032L1228
- Shanghai Zhongyi Ice Cream Equipment Co., Ltd.
- product brand:DANFOSS
- Messestand Nr.：E2A39
- product specification:
- product category:Refrigeration Equipment-Refrigeration systems and plants-Chillers, liquid
- product introduction:Danfoss Danfoss solenoid valve selection based on solenoid valve selection should first follow the safety, reliability, applicability, economy four principles, secondly, according to the six aspects of the field conditions (pipeline parameters, fluid parameters, pressure parameters, electrical parameters, operation mode, special requirements for the selection) . Selection Basis: 1, according to pipe parameters to choose solenoid valve: size specification (that is, DN) , interface 1) according to the site pipe diameter size or flow requirements to determine the size (DN) ; 2) Interface, General & GT; DN50 to choose flange interface, ≤ DN50 can be free choice according to user needs. Sentence is too long, please supply a shorter sentence. 3, according to the pressure parameter choice solenoid valve: principle and Structure Variety 1) nominal pressure: This parameter and other general valve meaning is the same, is based on the pipeline nominal pressure to determine; 2) working pressure: If the working pressure is low must choose straight or step straight principle; Zui low working pressure difference above 0.04 MPA straight, step straight, pilot can be selected. 4, electrical selection: Voltage specification should be preferred to choose AC220V, DC24 more convenient. 5, according to the length of continuous working time to choose: Normally closed, normally open, or sustainable power 1) when the solenoid valve needs a long time to open, and the duration of the time should be more than the time to close, with normally open; 2) if the time to open short or open and close the time is not much, then choose normally closed; 3) but some for safety protection of working conditions, such as furnace, kiln flame monitoring, can not choose often open, should choose can be long-term electrification. 6, according to the environmental requirements of the selection of auxiliary functions: explosion-proof, check, manual, waterproof fog, water drenching, diving. Danfoss Danfoss solenoid valve selection principles of Safety: 1, Corrosive Media: The appropriate choice of plastic Wang solenoid valve and all stainless steel; for strong corrosion media, must choose isolation diaphragm type. Neutral medium, also should choose copper alloy for the valve Shell Material solenoid valve, otherwise, the valve shell often rust chip off, especially action is not frequent occasion. Ammonia valve can not use copper. 2, Explosive Environment: must choose the corresponding explosion-proof grade products, outdoor installation or dust should choose waterproof, dust-proof varieties. 3, the nominal pressure solenoid valve should be higher than the tube Zui high working pressure. Applicability: 1, medium characteristics 1) gas, liquid or mixed state respectively choose different kinds of solenoid valve; 2) medium temperature different specifications products, otherwise the coil will burn out, seals aging, seriously affect the service life; 3) medium viscosity, usually below 50cSt. If more than this value, diameter greater than 15 mm, with a multi-functional solenoid valve; diameter less than 15 mm, with a high viscosity solenoid valve. 4) medium cleanliness is not high should be installed in front of the solenoid valve backwash filter valve, pressure is low, can choose direct film solenoid valve; 5) medium if the directional flow, and do not allow reverse flow, need to use two-way flow; 6) medium temperature should be selected in the solenoid valve allowed range. 2, pipeline parameters 1) according to the requirements of media flow direction and pipeline connection mode to select the valve opening and type 2) according to the flow and valve Kv value to select the nominal size, can also choose the same pipe diameter 3) working pressure difference: Zui Low working pressure difference above 0.04 MPA is optional indirect pilot type; Zui low working pressure difference close to or less than zero must choose direct type or step by step. 3, environmental conditions 1) the environment of Zui high and Zui low temperature should be selected within the allowed range; 2) the environment of high relative humidity and water dripping and other occasions, should choose waterproof solenoid valve; 3) the environment often have vibration, bump and impact occasions should choose special varieties, such as marine solenoid valve; 4) in the corrosive or explosive environment should be preferred according to the safety requirements of the use of anti-corrosion type; 5) the environment space is restricted, need to choose multi-functional solenoid valve, because it saves bypass and three manual valves and easy to online maintenance. 4, power supply conditions 1) according to the type of power supply, respectively choose AC and DC solenoid valve. Generally speaking, AC power supply easy to access; 2) voltage specifications as far as possible preferred AC220V. DC 24 V; 3) power supply voltage fluctuations usually AC select +% 10% . - 15% , DC allow ±% 10 or so, if out of tolerance, to take voltage-stabilizing measures; 4) should be based on the power capacity to choose rated current and consumption power. Must pay attention to AC starting when the VA value is high, in the capacity is insufficient should give priority to the use of indirect solenoid valve. 5. Control Accuracy 1) common solenoid valve only open, closed two positions, in the control accuracy requirements and parameter requirements of stable need to choose a multi-position solenoid valve; 2) action time: refers to the electrical signal on or off to the main valve action to complete the time; 3) leakage: The leakage of the sample given values for the commonly used economic grade. Reliability: 1, working life, this item is not included in the factory test project, belongs to the type test project. In order to ensure the quality of products should be selected regular manufacturers. 2. Working System: divided into long-term working system, repeated short-term working system and short-term working system. For a long time to open the valve only a short time to close the case, it is appropriate to choose the normally open solenoid valve. 3. Working Frequency: When the action frequency is high, the structure should preferably choose the direct-acting solenoid valve and the power supply should preferably choose the AC. 4, Action Reliability strictly speaking, this test has not been formally included in the professional standards of China solenoid valve, in order to ensure the quality of products should be selected regular manufacturers. Some occasions action number is not much, but the reliability requirements are very high, such as fire, emergency protection, must not be taken lightly. Especially important, should also take two to use double insurance. Economy: one of the measures it chooses, but it must be economy on the basis of safety, applicability and reliability. Economy is not only the price of the product, but also give priority to its function and quality as well as the cost of installation, maintenance and other accessories. More importantly, a solenoid valve in the whole automatic control system in the whole automatic control system and even in the production line of the cost is negligible, if cheap and wrong selection and damage group is huge.
