Usually say of pressed a bad control valve from the dint type, its function is to control the pressing of a certain road or a certain customer in the network bad, make of basic Heng settle, but oneself consume of press bad then variety of, is exactly passed adjustment opening of oneself degree, adjust the oneself consumes of press bad, with the realization is controled pressing of object bad Heng settle.This kind of pressing a bad control valve is being provided for hot air condition engineering to have already had a more application, particularly BE, in the door in cent that calculate to provide warm engineering drive extensive adoption, so is acquainted with by everyone and understand.This text introduces a kind of different from it function from the dint type press bad control valve, its function is to control a pressing of oneself bad, as a result can be called an oneself to press bad control valve.In the meantime, inquiry into it at warm application within engineering.
1, structure and work principle
Here with the zy 47-16 c type the oneself press bad control valve for example, introduce an oneself to press the work principle of differing the control valve.The spring coil, feeling presses film and the valve pole solid knot together, passing to lead to press a tube will export pressure p 2 ductings press a sealing completely of film upper part chamber, the feeling presses the film lower part as entrance pressure p 1.According to p 1-p 2 of initial value δ ps(call enactment to press as follows bad) assurance the preparing of spring coil compress quantity, even if elasticity and enactment of spring coil press bad condition under the feeling press a film the equality is to the function dint of the spring coil.The route of travel that combines to fill according to the valve is farer small than spring coil to prepare to compress the principle choice of the quantity spring coil.So make any open the equilibrium of degree in the valve door, the entering of valve, exit presses bad δ p and enactment to press bad the δ ps look like equality.Strictly says, open one degree different, the δ p of equilibrium is unequal.Obviously, along with open the aggrandizement of degree, the δ p of equilibrium is an aggrandizement.But pass the choice toward the spring coil, completely can fill in the valve of inside the whole route of travelses, is more opposite than the δ p of equilibrium deviating of δ ps the control is in the certain scope(for example 10%) inside.
From the dint type oneself press a bad control valve can is divided into two kinds of circumstances to carry on elucidation in the work in the system:①The appearance is a close at present.If valve before or after presses bad δ p is smaller than enactment to press bad δ ps, then continue to close, is a pass to break valve at this time.If the δ p is bigger than δ ps, the feeling then presses the elasticity that the film overcomes spring coil and arouses valve to fill ascension, the valve door opens;Enter while attaining equilibrium, the exit press bad δ p to look like to drop enactment to press bad δ ps.②At present appearance for open.If the system stabilizes movement and enters, the exit press bad the δ p look like to press to differ for enactment.If make the aggrandizement of δ p because of the change of system work condition, the door of the valve then opens greatly, the discharge enlarges;The δ p looks like to drop δ ps again while attaining equilibrium.Valve door for biggest open a degree, appear δ p is bigger than the circumstance ofδ ps, the valve door no longer has to adjust to control to press bad ability.If make into because of the change of system work condition, exit's pressing bad δ p is smaller than δ ps, the door of the valve then closes small, the discharge lets up, the δ p looks like to rise δ ps again while attaining equilibrium.Until when the valve door closes appear δ p is smaller than the circumstance ofδ ps, no longer have to adjust to control to press bad ability, but become a pass to break valve.Chien but speech, from the dint type oneself press a bad control valve while closing appearance, the δ p has to be bigger than δ ps to open;While opening appearance, can automatically adjust to open a degree, keep a valve door to press bad basic Heng to settle before or after.
2, the oneself press to differ a control valve an application within engineering at the warm
2.1 at protect the application of cold hot source
In recent years, in the middle of providing hot engineering, fuel and gas machine set contained more application.In order to regulating consciousness of discharge to consumedly strengthen towards being provided for warm execution to calculate charging, customer's independence, plus a life to use hot water dosage variety within a day more big, make the discharge of providing the hot system had very big variety scope.If the discharge leads small, may result in the partial ebullition of fuel and gas machine set, then make the machine set been subjected to breakage.For cold water machine set in the air condition system, if freezing water current quantity is too small, may also result in evaporation row to take care of part congelation, then make the machine set been subjected to breakage.For above two kinds of circumstances, aside take care of road up, equip from the dint type oneself press bad control valve.Because the customer regulates etc. reason to make the system discharge let up and press a bad control valve to press bad δ p before or after meeting immediately enlarge, be δ p is bigger than enactment to press bad δ ps, press bad the control valve open and enlarge the discharge of passing the cold hot source, it is safe to circulate to guarantee a machine set.At press a bad control valve for open appearance, can always keep valve before or after press bad basic Heng settle.But pass the discharge of valve to then present contrary variety with the discharge of customer's system.Then the discharge of customer's system lets up, pass to press the discharge of differing the control valve and then will enlarge;Contrarily, the discharge of customer's system enlarge, the discharge that then passes to press to differ a control valve lets up.So can promise to pass the discharge of cold hot source to unlikely have too big variety, since protected a cold hot source, and then raised the stability of machine set movement.
The traditional way that protects a cold hot source is aside a tube road to up equip dynamoelectric press a bad control valve.When the system discharge lets up and make the dynamoelectric valve pressed before or after bad is bigger than enactment to press bad, the telecommunication number drives dynamoelectric valve to open and make cold hot source machine set maintenance have to of minimum discharge.But dynamoelectric press a bad control valve because of to the power with deliver the dependence of the circuit of telecommunication number, the dependable degree rather presses from the dint type bad control valve.Moreover, the price is also higher than the latter a lot of.So, in the aspects of protecting a cold hot source, completely can use to press a bad control valve to act for from the dint type oneself traditional of dynamoelectric control valve.Conveniently mention, in the figure 2 show of side tube road up equip the electromagnetism valve isn't fitting, because electromagnetism valve only have close and all open two kinds of appearances, so its act every time, will produce the bigger influence on the discharge of customer's system.
2.2 provide the application in the hot system in the concentration
BE provided to usually appear a circumstance like this in the hot engineering in the concentration:Be provided for warm customer to have low building(shorter of building or the geography lower building) with high construct(key figures building or the geography higher building), if the pressure work of the hot net condition satisfy low building of spread a hot machine is not pressed a bad request, high building will appear to pour empty phenomenon;If the pressure work condition of the hot net satisfies high building not appear to pour empty phenomenon, low architectural then of spread the pressure that the hot machine bears meeting exceed it accept the ability of pressing.Asking for help of an oneself to press a bad control valve usually can solve this antinomy.
Fluently hit the ground power characteristics, is supplying water a tube road appropriate position constitution to add to press water pump, in the backwater take care of the road appropriate position to equip from the dint type oneself press bad control valve.Circulate process in the system in, press a bad control valve to press to will barely do keep basic Heng to settle before or after.So move a network the water pressure line is divided into two parts, the moving of forepart water pressure line is opposite and lower, can satisfy the spreading of low building hot machine is not pressed a bad request;Empress the department move water pressure line opposite and higher, can satisfy a high building not occurrence pour the request of empty phenomenon.When the system stops circulating, the whole network measures to press tube water head has already attained consistent trend, but presses the bad control valve then passes to let up to open a degree to make greatest efforts to maintain to originally press bad basic constant, until press bad control valve close.At this time, press bad control valve and water supply to take care of road up of the check valve open after the network the department and the forepart insulation together.The quiet water pressure line of network forepart is certainly pressed to equip assurance at repairing of hot source water by the constitution.After the network the quiet water pressure line of department from with press a bad control valve to go together with to pack to together and certainly press to repair water pump assurance.
Contrary, if the geography discrepancy hangs extremely, but hot source aloft, then such as figure 4 show, fluently hit the ground power characteristics, at supply water tube the road appropriate position to equip an oneself to press bad control valve, take care of the road appropriate position to equip to add to press water pump in the backwater.When the system circulates, press a bad control valve to press to will barely do keep basic Heng to settle before or after, so make after the network moving of department the water pressure line is opposite and lower, can satisfy low building of spread a hot machine is not pressed a bad request;The network forepart moves water pressure line opposite and higher, can satisfy a high building not to take place to pour empty phenomenon.When system stopped circulating, press bad the control valve was automatic to close and took care of the check valve of road with backwater together, opened after the network the department and the forepart insulation.The quiet water pressure line of network forepart is certainly pressed device to promise at repairing of hot source water by the constitution, after the network the quiet water pressure line of department then from before connecting, after repairing of repairing of department pipe line road water regulate valve assurance.
3, conclusion
Pressed a bad control valve from the dint type oneself for closed appearance, if before the valve, empress of press bad is smaller than enactment to press bad, then continue to close;If before the valve, empress of press bad is bigger than enactment to press bad, the door of the valve then opens.For open appearance, can automatically adjust to open a degree, make before the valve, empress of press bad basic Heng to settle.
Press to differ a control valve to used for the protection to the cold hot source from the dint type oneself, with traditional of the dynamoelectric control protection compare and have the control the advantage with dependable and cheap price.
From the dint type oneself press bad the control valve can be used for solution the concentration be extremely provided for the high building and the low building height discrepancy in the warm engineering to hang produce of request different antinomy to the pressure work condition