SI9520109A

SI9520109A - Pressure valve for compressor

Info

Publication number: SI9520109A
Application number: SI9520109A
Authority: SI
Inventors: Frank Holm Iversen
Original assignee: Danfoss Copressors Gmbh
Priority date: 1994-10-24
Filing date: 1995-10-19
Publication date: 1997-10-31
Also published as: DE19504267A1; DE19504267C2; MX9702851A; PL319686A1; DK122894A; KR970707388A; EP0782670A1; BR9509425A; AU3697795A; WO1996012892A1

Abstract

The present invention relates to a pressure valve for a compressor, particularly for a hermetically sealed refrigerator, whose valve plate has a longitudinal recess containing a valve seat, a flat valve spring and a retainer bridge, where the effective length of the flat valve spring is larger when the valve is closed that when it is open. As a result, the valve is soft when it is near its closed position, and stiff when it is open. This ensures quick emptying of the cylinder with minimum pressure drop across the pressure valve, and the efficiency of the compressor is increased.

Description

Predmet pričujočega izuma je tlačni ventil za kompresor, zlasti za hermetično zatesnjen hladilnik, katerega ventilna plošča ima vzdolžno poglobitev, ki vsebuje ventilni sedež, plosko ventilno vzmet in mostični pokrov.It is an object of the present invention to provide a compressor pressure valve, in particular for a hermetically sealed refrigerator whose valve plate has a longitudinal recess containing a valve seat, a flat valve spring and a bridge cover.

Iz patentnega spisa DE 33 05 791 C2, med drugimi, je splošno poznana namestitev tlačnih ventilov v poglobitve v ventilni plošči. Iz DanfossovihDE 33 05 791 C2 discloses, among other things, the placement of pressure valves in recesses in the valve plate. From the Danfoss

J kompresorjev tipa NL je poznano, da zareze vodijo plosko ventilno vzmet in ojačevalno ploščo. Mostični pokrov je tesno pritisnjen v poglobitev, držeč elemente pod seboj v njihovi legi.J NL type compressors are known to cut notches for a flat valve spring and reinforcement plate. The bridge cover is pressed tightly into the recess, holding the elements below them in their position.

Iz patentnih spisov DE-OS 2 215 974, DE-OS 2 842 611 in DE 39 09 176 Al so poznane dolge ploske ventilne vzmeti, ki so fiksirane na obeh straneh ventilnih odprtin. Ploske ventilne vzmeti in mostični pokrovi so pritrjeni na površino ventilnih plošč z vijaki ali zatiči.From the patent files DE-OS 2 215 974, DE-OS 2 842 611 and DE 39 09 176 Al, long flat valve springs which are fixed on both sides of the valve openings are known. Flat valve springs and bridge covers are fixed to the surface of valve plates by screws or pins.

Naloga pričujočega izuma je, da zagotovi tlačni ventil, ki povečuje učinkovitost kompresorja, s tem da se hitro odpira in zapira, ima dolgo življenjsko dobo in nizke proizvodne stroške.It is an object of the present invention to provide a pressure valve that increases the efficiency of the compressor by opening and closing rapidly, having a long service life and low production costs.

S tlačnim ventilom, kot je opisan v uvodu, je naloga po izumu rešena tako, da je efektivna dolžina ploske ventilne vzmeti večja takrat, ko je ventil zaprt, kot takrat, ko je odprt.With the pressure valve as described in the introduction, the task of the invention is solved such that the effective length of the flat valve spring is greater when the valve is closed than when it is open.

Na ta način dobimo mehak ventil, ko je blizu zaprte lege, in togega, ko je odprt. To omogoča hitro praznjenje cilindra z minimalnim padcem tlaka v tlačnem ventilu. Pri tem se poveča učinkovitost kompresorja. Proizvodni stroški za tlačni ventil so nizki, ker ni uporabljena ojačitvena plošča.That way, we get a soft valve when close to closed and rigid when open. This allows the cylinder to be emptied quickly with minimum pressure drop in the pressure valve. This increases the efficiency of the compressor. Production costs for the pressure valve are low because no reinforcement plate is used.

Ploska ventilna vzmet se lahko vodi na obeh koncih poglobitve. To omogoča učinkovito zagotovitev lege ploske ventilne vzmeti v primerjavi z znanimi ventili, ki so vodeni samo na enem koncu ploske ventilne vzmeti. Tudi obrabna odpornost ventila se izboljša zaradi tega, ker rob poglobitve obkroža plosko ventilno vzmet z vseh strani.The flat valve spring can be guided at both ends of the recess. This effectively ensures the position of the flat valve spring compared to known valves which are guided only at one end of the flat valve spring. Also, the wear resistance of the valve is enhanced by the fact that the recess edge surrounds the flat valve spring on all sides.

Ploska ventilna vzmet lahko, kar je ugodno, leži prosto, toda na obeh koncih je lahko zavarovana z nad njo ležečim mostičnim pokrovom. Pri tem konca mostičnega pokrova držita oba konca ploske ventilne vzmeti blizu dna poglobitve, medtem ko se srednji del ploske ventilne vzmeti lahko pomakne navzgor, da se dotakne mostičnega pokrova.The flat valve spring may conveniently lie free, but at both ends it may be secured by a bridge bridge above it. In doing so, the ends of the bridge cover are held by both ends of the flat valve spring near the bottom of the recess, while the middle portion of the flat valve spring can be moved upwards to touch the bridge cover.

Ploska ventilna vzmet je lahko, kar je ugodno, prednapeta v smeri odpiranja. To zmanjša silo, ki jo mora tlak plina premagati, da odpre ventil, in pri enakem tlaku v ventilu, se ta odpre.The flat valve spring can be conveniently biased in the direction of opening. This reduces the force that the gas pressure must overcome to open the valve, and at the same pressure in the valve, it opens.

Ventil ima lahko mehko karakteristiko odpiranja med začetnim odpiranjem, medtem ko se karakteristika odpiranja pri povečanem odpiranju povečuje postopoma. Pri tem je udarec ob mostični pokrov udušen, zmanjšan pa je tudi udarec ob ventilni sedež.The valve may have a soft opening characteristic during the initial opening, while the opening characteristic increases with increasing opening. The impact on the bridge cover is suffocated and the impact on the valve seat is reduced.

Pri popolnem odprtju lahko ploska ventilna vzmet izvede povratni gib vzmeti, ki zagotovi hitro zaprtje ventila.When fully opened, the flat valve spring can perform a return stroke of the spring to ensure that the valve closes quickly.

Poglobitev v ventilni plošči ima lahko manjšo globino, ki sprejme mostični pokrov, in še drugo, večjo globino, ki sprejme plosko ventilno vzmet. Pri tem lahko ploska ventilna vzmet varno leži pod mostičnim pokrovom, ne da bi bila fiksirana, vodi pa jo druga poglobitev.The recess in the valve plate may have less depth to accommodate the bridge cover and another, greater depth to accommodate the flat valve spring. In this case, the flat valve spring can be safely located under the bridge hood without being fixed and guided by a second recess.

Ploska ventilna vzmet se lahko v več točkah dotika dna poglobitve in mostičnega pokrova, kjer pa se stične točke med ciklom odpiranja/zapiranja ventila spreminjajo in/ali premikajo. Pri tem se bo aktivna dolžina ploske ventilne vzmeti spremenila iz dolge in mehke vzmeti, ko je ventil tesno ob ventilnem sedežu, v krajšo in bolj togo vzmet, ko je ventil odprt.The flat valve spring can touch the bottom of the recess and the bridge cover at several points, where the contact points change and / or move during the valve opening / closing cycle. In doing so, the active length of the flat valve spring will change from a long and soft spring when the valve is tightly adjacent to the valve seat, to a shorter and more rigid spring when the valve is open.

Plosko ventilno vzmet lahko držijo izbokline ob straneh poglobitve ter s tem nadalje zagotavljajo njeno pravilno lego pod mostičnim pokrovom.The flat valve spring can be held by the projections on the sides of the recess, thus further securing its correct position under the bridge cover.

Ploska ventilna vzmet je, kar je ugodno, široka na koncih in nad ventilnim sedežem, medtem ko je ožja med ventilnim sedežem in koncema. To zagotavlja dober pretok navzven, ko je ventil odprt. Stisnjeni zrak je potisnjen iz poglobitve, kjer je ploska ventilna vzmet ozka. Ozka območja ploske ventilne vzmeti prispevajo tudi k temu, da je ventil mehkejši.The flat valve spring is, conveniently, wide at the ends and above the valve seat while narrower between the valve seat and the ends. This ensures good outward flow when the valve is open. The compressed air is pushed out of the recess where the flat valve spring is narrow. The narrow areas of the flat valve springs also make the valve softer.

Ploska ventilna vzmet ima lahko prvi pregib navzgor v razdalji od levega roba, ki znaša 15 - 30 odstotkov dolžine ploske ventilne vzmeti. Pri tem je ploska ventilna vzmet prednapeta v smeri odpiranja.The flat valve spring may have a first upward bend in the distance from the left edge, which is 15 - 30 percent of the length of the flat valve spring. In doing so, the flat valve spring is biased in the direction of opening.

Ploska ventilna vzmet ima lahko tudi drugi pregib navzgor v razdalji od desnega roba, ki znaša 1-5 odstotkov dolžine ploske ventilne vzmeti. Pri začetnem odpiranju je upognjeni konec v stiku z mostičnim pokrovom in prispeva k prednapenjanju sploske ventilne vzmeti.The flat valve spring may also have a second upward bend in the distance from the right edge, which is 1-5 percent of the length of the flat valve spring. On initial opening, the bent end is in contact with the bridge cover and contributes to the prestressing of the general valve spring.

Ko je ventil zaprt, se lahko ploska ventilna vzmet na levem robu dotika mostičnega pokrova v prvi stični točki, ploska ventilna vzmet pa se lahko dotika ventilne plošče levo od ventilnega sedeža v drugi stični točki, ploska ventilna vzmet pa se lahko dotika ventilne plošče tudi na desnem robu v tretji stični točki. Rezultat tega je mehka vzmet, za odprtje ventila pa je potreben minimalen tlak.When the valve is closed, the flat valve spring on the left edge can touch the bridge cap at the first contact point, the flat valve spring can touch the valve plate to the left of the valve seat at the second contact point, and the flat valve spring can also touch the valve plate at the right edge at the third contact point. The result is a soft spring, and minimal pressure is required to open the valve.

Ko je ventil v nevtralni legi, se lahko ploska ventilna vzmet na levem robu še vedno dotika mostičnega pokrova v prvi stični točki, ploska ventilna vzmet pa se še vedno lahko dotika ventilne plošče levo od druge stične točke, medtem ko se na desnem robu ploska ventilna vzmet dotika mostičnega pokrova v četrti stični točki. Tako se ventil odpre pri enakem tlaku, padec tlaka v ventilu pa je precej zmanjšan.When the valve is in the neutral position, the flat valve spring on the left edge can still touch the bridge cover at the first contact point, and the flat valve spring can still touch the valve plate to the left of the second contact point while on the right edge the flat valve the spring touches the bridge cover at the fourth contact point. Thus, the valve opens at the same pressure, and the pressure drop in the valve is considerably reduced.

Pri začetnem odpiranju se lahko ploska ventilna vzmet na levem robu še vedno dotika mostičnega pokrova v prvi stični točki, na nasprotni strani ventilnega sedeža pa se lahko ploska ventilna vzmet dotika mostičnega pokrova v peti stični točki, ploska ventilna vzmet pa se lahko z drugim pregibom dotika ventilne plošče. Pri tem je ploska ventilna vzmet fiksirana na svojem desnem koncu, ventil pa postane bolj tog.On initial opening, the flat valve spring on the left edge can still touch the bridge cover at the first contact point, and on the opposite side of the valve seat, the flat valve spring may touch the bridge cover at the fifth contact point, and the flat valve spring may touch the second bend valve plates. In doing so, the flat valve spring is fixed at its right end and the valve becomes more rigid.

Pri popolnem odprtju se lahko ploska ventilna vzmet na levem robu dotika mostičnega pokrova s stično ploskvijo, na nasprotni strani ventilnega sedeža pa se lahko ploska ventilna vzmet dotika mostičnega pokrova v šesti stični točki, ploska ventilna vzmet pa z drugim pregibom pritiska ob ventilno ploščo. Pri tem postane ventil zelo tog, efektivna dolžina ploske ventilne vzmeti pa se zmanjša. Tog ventil izvede povratni gib vzmeti proti ventilnemu sedežu, pri tem pa zagotavlja hitro zapiranje. Prednapenjanje ploske ventilne vzmeti pred stikom zavira plosko ventilno vzmet, obraba ventilnega sedeža pa se zmanjša.When fully opened, the flat valve spring on the left edge can touch the bridge cover with the contact surface, on the opposite side of the valve seat, the flat valve spring can touch the bridge cover at the sixth contact point and the flat valve spring presses against the valve plate with another bend. The valve becomes very rigid and the effective length of the flat valve spring is reduced. The rigid valve returns the spring towards the valve seat, ensuring fast closing. The prestressing of the flat valve spring suppresses the flat valve spring prior to contact and the valve seat wear is reduced.

V nadaljevanju je izum pojasnjen s pomočjo skic. Te prikazujejo:The invention will now be explained by way of drawings. These show:

Sl. 1 Možna izvedba ploske ventilne vzmeti, prikazana od zgoraj.FIG. 1 Possible version of flat valve spring shown above.

Sl. 2 Možna izvedba ploske ventilne vzmeti, prikazana od strani.FIG. 2 Possible design of flat valve spring, shown from the side.

Sl. 3 Možna izvedba izuma, kjer je ventil zaprt zaradi protipritiska.FIG. 3 A possible embodiment of the invention where the valve is closed due to backpressure.

Sl. 4 Ista izvedba, toda z rahlo odprtim ventilom - tu prikazana, ko je tlak izenačen.FIG. 4 Same design but with slightly open valve - shown here when pressure is equalized.

Sl. 5 Ista izvedba kot na sl. 4, toda z ventilom na začetni stopnji odpiranja.FIG. 5 The same embodiment as in FIG. 4, but with a valve at the initial opening stage.

Sl. 6 Ista izvedba kot na sl. 5 s popolnoma odprtim ventilom.FIG. 6 The same embodiment as in FIG. 5 with fully open valve.

Sl. 1 prikazuje možno izvedbo ploske ventilne vzmeti s pogledom od zgoraj. Širina ploske ventilne vzmeti je največja na koncih 15 in 17 ter v sredini 13 nad ventilnim sedežem 11. Med koncema in ventilnim sedežem se nahajata zožitvi 18 in 19. Ti zožitvi zagotavljata dober prehod plina, ko teče od spodaj navzgor okoli ploske ventilne vzmeti 12. Podobno zožitvi 18 in 19 prispevata k zmehčanju ventila.FIG. 1 shows a possible embodiment of a flat valve spring with a top view. The width of the flat valve spring is greatest at the ends 15 and 17 and in the center 13 above the valve seat 11. There are constrictions 18 and 19 between the ends and the valve seat. These constrictions provide good gas passage as it flows from the bottom upwards around the flat valve spring 12. Similar to narrowing 18 and 19, they contribute to the softening of the valve.

Sl. 2 prikazuje možno izvedbo ploske ventilne vzmeti s pogledom od strani, pri čemer je videti prvi pregib 14 in drugi pregib 16.FIG. 2 shows a possible embodiment of a flat valve spring with a side view, showing a first bend 14 and a second bend 16.

Sl. 3 prikazuje ventilno ploščo 1, značilno za kompresor hladilnika, kjer se ventilna plošča nahaja na vrhu valja ter tvori zgornjo mejo valja. Ventilna plošča 1 ima odprtino tlačnega ventila 10, na zgornji strani pa se nahaja ventilni sedež 11. Nad odprtino ventila 10 in ventilnim sedežem 11 se nahaja ploska ventilna vzmet 12, v svoji legi pa je zavarovana z nad njo ležečim mostičnim pokrovom 4.FIG. 3 shows a valve plate 1 typical of a radiator compressor, wherein the valve plate is located at the top of the cylinder and forms the upper border of the cylinder. Valve plate 1 has an opening of the pressure valve 10, and on the upper side there is a valve seat 11. Above the valve opening 10 and the valve seat 11 there is a flat valve spring 12, and in its position is secured by a bridge bridge 4 above it.

Mostični pokrov 4 in ploska ventilna vzmet 12 sta nameščena v poglobitvi 2 in 3. Poglobitev 2 preprečuje, da bi ploska ventilna vzmet 12 zdrsnila vstran ali po dolgem, medtem ko poglobitev 3 fiksira mostični pokrov 7, kjer je mostični pokrov morda pritisnjen v poglobitev 3. Ploska ventilna vzmet 12 ima na levem robu 5 z mostičnim pokrovom 4 stično točko 20. Obstaja tudi stična točka 21, kjer ima pregib 14 (sl. 2) na ploski ventilni vzmeti 12 stik z ventilno ploščo 1. Na desni strani je ploska ventilna vzmet 12 v stiku z ventilno ploščo 1 v stični točki 22. Ker je tlak višji nad plosko ventilno vzmetjo 12 kot pod njo, je ventil zaprt.The bridge cover 4 and the flat valve spring 12 are located in the recesses 2 and 3. The recess 2 prevents the flat valve spring 12 from sliding sideways or long, while the recess 3 fixes the bridge cover 7, where the bridge cover may be pressed into the recess 3 The flat valve spring 12 has a contact point 20 on the left edge 5 with the bridge cover 4. There is also a contact point 21, where the bend 14 (Fig. 2) on the flat valve spring 12 has contact with the valve plate 1. On the right side there is a flat valve spring spring 12 in contact with valve plate 1 at contact point 22. As the pressure is higher above the flat valve spring 12 than below it, the valve is closed.

Sl. 4 prikazuje ventil ob izenačenju tlaka, kjer prednapenjanje ventila povzroči, da se le-ta odpre. Ploska ventilna vzmet 12 ima še vedno stik v točkah 20 in 21 levo od ventilnega sedeža, toda desno od ventilnega sedeža se je ploska ventilna vzmet dvignila iz točke 22, tako da sedaj tvori stik z upognjenim robom 17 v stični točki 23. Zaradi dejstva, da je ploska ventilna vzmet 12 prednapeta v smeri odpiranja, je zagotovljen minimalni padec tlaka v ventilu, ko je tik pred tem, da se odpre. To pomeni, da se ta ventil odpre prej kot poznani tlačni ventili.FIG. 4 shows a pressure equalization valve where the prestressing of the valve causes the valve to open. The flat valve spring 12 still has contact at points 20 and 21 to the left of the valve seat, but to the right of the valve seat, the flat valve spring has risen from point 22 so that it now forms contact with the bent edge 17 at contact 23. Due to the fact that that the flat valve spring 12 is prestressed in the direction of opening, a minimum pressure drop in the valve is guaranteed when it is just before it opens. This means that this valve opens earlier than known pressure valves.

Sl. 5 prikazuje ventil, ko obstaja začetni pretok navzven. Sl. 5 se razlikuje od sl. 4 v tem, da ni več stika v točki 21. Ploska ventilna vzmet 12 se je dvignila s stika z ventilno ploščo 1. Na nasprotnem koncu je navzgor upognjeni konec ploske ventilne vzmeti 12 povzročil stik v stični točki 24, medtem ko sedaj obstaja istočasno stik pregiba 16 ploske ventilne vzmeti (sl. 2) z ventilno ploščo v stični točki 25.FIG. 5 shows a valve when there is an initial outflow. FIG. 5 is different from FIG. 4 in that there is no more contact at point 21. The flat valve spring 12 has risen from contact with valve plate 1. At the opposite end, the upward bent end of the flat valve spring 12 has caused contact at contact point 24, while there is now simultaneous contact it bends 16 flat valve springs (Fig. 2) with a valve plate at point 25.

Pri tem je bila ploska ventilna vzmet fiksirana in tako postane ventil bolj tog. Potrebne so le majhne tlačne sile, da premaknejo plosko ventilno vzmet iz lege, prikazane na sl. 4, v lego, prikazano na sl. 5. To pomeni, da zadostuje zelo majhen diferencialni tlak, da odpre ventil in zagotovi relativno veliko hitrost iztekanja.In doing so, the flat valve spring was fixed, making the valve more rigid. Only small compressive forces are required to move the flat valve spring from the position shown in FIG. 4, in the position shown in FIG. 5. This means that a very small differential pressure is sufficient to open the valve and provide a relatively high flow rate.

Sl. 6 prikazuje popolnoma odprt ventil. Na levem koncu ploske ventilne vzmeti se je le-ta vzdignila tako visoko, da obstaja stik z mostičnim pokrovom v stični ploskvi 27. Neposredno nad ventilno odprtino 10 obstaja tudi stik z mostičnim pokrovom v točki 26, na desnem koncu ploske ventilne vzmeti pa sedaj obstaja stik z mostičnim pokrovom v stični točki 27. Primerjava sl. 3 in sl. 4 pokaže, da se je stična točka 24 premaknila, tako da ima sedaj stik v točki 27. Podobno se je tudi stična točka 25 pomaknila v levo. To pomeni, da se je aktivna dolžina ploske ventilne vzmeti zmanjšala, kar ima za posledico zelo tog ventil. Ko se ventil prične zapirati, pride do zelo močnega povratnega giba ploske ventilne vzmeti. To zagotovi hitro zapiranje, toda hitro gibanje navzdol je zavrto pred stikom z ventilnim sedežem 11 zaradi tega, ker je ploska ventilna vzmet prednapeta v smeri odpiranja. To zagotavlja mehko zapiranje ob ventilni sedež, zmanjšuje obrabo in hrup ventila.FIG. 6 shows a fully open valve. At the left end of the flat valve spring it has risen so high that there is contact with the bridge cover in the contact surface 27. Immediately above the valve opening 10 there is contact with the bridge cover at point 26, and at the right end of the flat valve spring there is now contact with the bridge cover at point 27. Comparison of FIG. 3 and FIG. 4 shows that point 24 has moved so that it now has contact at point 27. Similarly, point 25 has moved to the left. This means that the active length of the flat valve spring has decreased, resulting in a very rigid valve. When the valve begins to close, a very strong return stroke of the flat valve spring occurs. This ensures rapid closure, but rapid downward movement is rotated before contact with valve seat 11 because the flat valve spring is biased in the opening direction. This ensures a soft closure to the valve seat, reducing valve wear and noise.

Za Danfoss Compressors GmbHFor Danfoss Compressors GmbH

Claims

A compressor pressure valve, in particular for a hermetically sealed refrigerator whose valve plate (1) has a longitudinal recess (2) comprising a valve seat (11), a flat valve spring (12) and a bridge cover (4), , that the effective length of the flat valve spring (12) is greater when the valve is closed than when it is open.

Pressure valve according to claim 1, characterized in that the flat valve spring (12) is guided at both ends of the recess (2).

Pressure valve according to claim 1 or 2, characterized in that the flat valve spring (12) lies freely, but is secured at both ends by a bridge cover (4) above it.

Pressure valve according to one of Claims 1 to 3, characterized in that the flat valve spring (12) is prestressed in the opening direction.

Pressure valve according to one of Claims 1 to 4, characterized in that the flat valve spring (12) has a soft opening characteristic at initial opening (Fig. 4), while the opening characteristic at increased opening (Fig. 5) becomes more of that.

Pressure valve according to one of Claims 1 to 5, characterized in that, when fully opened (Fig. 6), the flat valve spring (12) performs a return stroke.

Pressure valve according to one of Claims 1 to 6, characterized in that the recess in the valve plate (1) may have a first depth (3) for receiving the bridge cover (7) and a second, greater depth (2) for receiving a flat plate valve springs (12).

Pressure valve according to one of Claims 1 to 7, characterized in that the flat valve spring (12) has several contact points (20, 21, 22, 23, 24, 25, 26, 27) at the bottom of the recess (2) ) and on the bridge cover (7), where the points of contact (20, 21, 22, 23, 24, 25,

26, 27) change and / or move during the valve opening / closing cycle.

Pressure valve according to one of Claims 1 to 8, characterized in that the flat valve spring (12) is fixed by projections along the sides of the recess (2).

Pressure valve according to one of Claims 1 to 9, characterized in that the flat valve spring (12) is wide at the ends (15, 17) and wide (13) above the valve seat (11), while narrower (18) , 19) between the valve seat (11) and the ends (15, 17).

Pressure valve according to one of Claims 1 to 10, characterized in that the flat valve spring (12) has a first bend (14) upwards in the distance from the left edge, which is 15 - 30 percent of the length of the flat valve spring (12). ).

Pressure valve according to one of Claims 1 to 11, characterized in that the flat valve spring (12) also has a second bend (16) upwards in the distance from the right edge, which is 1-5 percent of the length of the flat valve spring (12). 12).

Pressure valve according to one of Claims 1 to 12, characterized in that the flat valve spring (12) is closed at the left edge of the bridge cover (4) at the contact point (4) when the valve (Fig. 3) is closed. 20) and the flat valve spring (12) touches the valve plate (1) to the left of the valve seat (11) at the contact point (21), and at the right edge the flat valve spring (12) has a contact point (22).

Pressure valve according to one of Claims 1 to 12, characterized in that the flat valve spring (12) is positioned when the valve is in the neutral position (Fig. 4) on the left edge of the bridge cover (7) at the contact point (7). 20) and the flat valve spring (12) touches the valve plate (1) to the left of the valve seat (11) at the contact point (21), while on the right edge the flat valve spring (12) touches the bridge cap (4) in points of contact (23).

Pressure valve according to one of Claims 1 to 12, characterized in that, upon initial opening (Fig. 5), the flat valve spring (12) on the left edge touches the bridge cover (4) at the contact point (20), on the opposite on the side of the valve seat (11), the flat valve spring (12) touches the bridge cover (4) at the contact point (24) and the flat valve spring (12) is pressed in the bend (16) against the valve plate (1).

Pressure valve according to one of Claims 1 to 12, characterized in that when the flat valve is fully opened, the valve spring (12) on the left edge touches the bridge cover (4) with the contact surface (27) on the opposite side of the valve seat (11). ), the flat valve spring (12) touches the bridge cover (4) at the contact point (27), and the flat valve spring (12) presses against the valve plate (1) in the bend (16).