DE2126794A1 - Reversing relay valve - Google Patents

Description

Patent attorneys _β .... ₄ . *

DIpL Ing. Α Wallach. * - \, · \, ·%: ··· .ZJ. WAM971

Dipl. Ing. G. Koch. *:: Ν *: PY: t79'orj η / γ

Dr.T.Haibach * "" '"" "* * ■ · *

8 Munich 2. 212679Λ

Kaufbifflfstr. 8, Tel. 240 275 ^{AUU / gH} Beckman Instruments, Inc., Fullerton, California, USA Reversing relay valve

The invention relates to reversing relay valves or pneumatic ones Amplifier.

The invention is particularly suitable for use in pneumatic control bsv. R ^ g-elayetssi ^ ito Pneunatieche Control systems and devices for industrial Purposes usually work over a pressure range from 3-15 pounds per square dollar »although some special systems Working with other printable areas The signals are usually via pipelines with proportionally small inside diameter and with lengths ranging from a few feet bia to 2000 feet or more. Pneumatic display devices, control or regulating devices and donors typically have volumes of up to about 5 cubic inches · diaphragm or piston valve «· Actuators often have intake capacities in the range of about 100 to about 6000 cubic nominal equivalent volume. Dsl * system usually has to be relatively weak on kloine Signals of a few tenths of a pound per square * or less are designed to respond.

.A 109 851/1109

Di * v @ u different manufacturers selected mechanical »konsteraktiven embodiments are unterschiedlichι fundamentally · Konseption however, is always the same. The pneumatic relay generates a relatively strong output in the range of 3-15 US pounds per square inch ₉ depending on the relatively weak input signal, for example a variable measured variable Display organ, a registration device or a tax or RegölaioehanisBus uia.

The invention has for its object to create a pneumatisetien Relay valve or amplifier sugrunde at which oil drain or tap speed (- "bleed rate") as well as the gain and capacity of the relay valve can be set according to ¥ nnsch. The relay should have a improved stability and lower hysteresis with a smaller overall size than the conventional relay vesi · » tile.

For this purpose, a reversing relay valve of the type mentioned according to the invention is characterized by the following parts a clelilusej a middle wall in the housing which divides the Gehäue® into a first and a second section or compartment and has a central bore which is @ both sections bs «. Compartments and an outlet channel running outward from the bore through the housing; a valve disposed in the first section or compartment pressure-sensitive diaphragm which adjacent the first compartment · in a first, or the Mittelwandung mn these adjacent sub-compartment and in a second "

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sub-compartment distant from the central wall subdivided} Vortriebtun ^ rBur connection of the distant sub-compartmenta

3Vt for connection

de · second portion respectively, the compartments with a Strttmungsalttelvorrat} a breather tungskanai _f which connects the adjacent or neighboring sub-compartment to the atmosphere | a bolt which is in operative connection with the diaphragm at one end and which extends from the diaphragm through the adjacent or adjacent sub-compartment into the part of the M * deep bore located on one side of the outlet duct} an exit seat on the surface of the Central hole between the Auegangekanal and the neighboring baw. adjoining sub-compartment ι a Droesel ball arranged in the central bore below the exit seat so that when the diaphragm is deflected in one direction as a result of a pressure drop in the distant sub-compartment compared to the pressure in the adjacent or adjoining sub-compartment, it comes to rest against the seat of the exit seat and thereby the The connection between the adjacent or adjoining sub-compartment on the one hand and the outlet channel and the second section or compartment on the other hand is blocked, while it opens this connection when the diaphragm is deflected in the opposite direction; o a feed seat provided in the central bore between the second section and the outlet channel, against which the ball, blocking the connection with the second section, can rest when the bolt as a result of an increase in the pressure in the distant sub-compartment relative to the _λ pressure in the adjacent or adjacent sub-compartment * - at the deepest in the central hole, protrudes and the ball

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ι presses against the accessory seat as well as through devices aear Adjusted the distance between the feed seat and the Exit seat star control of gain and capacity of the relay.

Embodiments of the invention are illustrated in the following described in the drawing} in this shows

Fig. 1 in a schematic sectional view of a Rttok-

current relay valve according to one embodiment the invention5

Fig. 2 In a schematic sectional view in Riick-8 trosa-Rel as a valve according to another embodiment the invention;

Fig. 3 is an enlarged view of the supply side or inlet Sitzfloche of the valve ball in the valve according to FIG _s 2.

The figures show the same or corresponding parts numbered with the same reference numbers «

Visible vie of FIG. 1, reflux for relay valve according to the invention an ale whole designated 10 housing, a central portion 12 of the housing 10 old one is centrally disposed bore acts lh as a release · wall for dividing the housing into a first portion 16 and a second section 18, the bore or

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the channel 14 connects the two sections 16 and 18 and an outlet channel 20 extending from the bore Ik through the housing 10. The housing section 16 is subdivided into two sub-compartments by a pressure-sensitive diaphragm membrane 22 held tightly by means of a sealing tube 23, namely a first sub-compartment 2k or a sub-compartment 2k adjacent to the middle part 12 and a lower compartment 26, which is distant or distant from the central part 12 is connected via an inlet opening 27 and a line 28 to an inlet pressure flow medium source (not shown). The second section 18 is connected to a fluid supply via a supply line 30. A ventilation opening 3 1 connects the sub-compartment 24 adjoining or adjacent to the middle part 12 with the atmosphere.

A pin or · pin 36 is at its one end 38 'that is formed of an enlarged T-cross-sections in the illustrated embodiment in shape, with the diaphragm membrane 22 in operative connection and extends from the latter by the adjacent sub-compartment 2k k into the bore 1 in The bolt 36 is provided on its end face 38 with a recess 39 which cooperates with a corresponding projection k of the diaphragm membrane 22 for centering the bolt 36. At the mouth of the bore 14 between the outlet channel 20 and the adjacent or adjoining sub-compartment Zk, an exit seat surface, denoted by kO, is provided. In the bore 14 below the exit seat surface kO and

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desa «ved end · 44 d ·· BoIsen · 36 is a · Dross« ilrag ·! 46 e @ arranged _t that it is abutted against di · exit · - passes and seat 4θ In the bore 14 in this case the VerMadung between the adjacent or adjoining Unt®s & bteil 24 on the one hand and the Auegangekanal 20 and the fight Abaohnitt 18 on the other blocks, when the slide 22 is deflected in one direction (upward in the illustrated embodiment) as a result of a reduction in the pressure (P) in the distant sub-compartment 26 relative to the struck (? _) in the adjacent or adjoining sub-compartment 24; correspondingly, when the diaphragm 22 is deflected in the other direction, said connection is opened again by the throttle ball.

In ύον bore 14 is also provided between the second section 18 and the Auegangekanal 20 οin as a whole with 48 designated supply seat; this has a seat surface 80 smt against which the ball 46 comes to rest and hereby interrupts the connection with the second section 18 when the bolt 36 due to an increase in pressure in the distant sub-compartment 26 is relative to the pressure in the toenah The bearded or adjoining lower compartment 24 protrudes deepest into the flooring 14 and hereby the ball 46 presses against the seat surface 80 of the seat 48 on the supply side. With the aid of suitable devices, such as, for example, mutually acting screw threads 50 and 52 on the bore and the supply part 48, the distance between the inflatable seat part 48 and the outlet part 4θ can be adjusted. In this way, the full veret * llber * i © & of the ball 46 to achieve a desired V * r-

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Strengthening or bleeding or tapping speed ("bleed * rate") elnatellon. An O-ring 43 serves as a seal and securing between the seat part 48 on the inlet side and the bore 14. The ball 46 is slidable in the bobbin 14 between the outlet side 40 and the inlet old 48 according to the inlet dzoDka _{P A} Generation of an output pressure P proportional to the singular pressure P »

In the embodiment shown in FIG. 2, a toroidal spring element 56 is arranged between the end part 38 of the bolt 36, which is in contact with the diaphragm assembly 22, and the central part 12. The spring element adds a preload to the self-resilience of the diaphragm & memhran. In line 28, which in this case is connected to line 30, a throttle member 58 is provided such that the pressure P _n in the remote sub-compartment 26 is less than the inlet pressure P in the fluid feed line in a predetermined relationship

30 and the second section 18 is. The pressure P _Q in the remote lower compartment 26 is further controlled by a flap 60 acting on a valve nozzle 62. The position of the flap 60 can be adjusted by a measuring device or otherwise and controls the exit of the fluid, for example the air, through the nozzle 62 in such a way that the pressure P is kept at a desired level.

As in detail from the detailed representation in Fig. 3 can be seen, is in the embodiment shown in Fig. 2 aforsi the feed side seat 48 as a unit nlt an external

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hill ■ β 6k formed, the adjustable arranged in the bore 14 and let on its inner, d. h · lh projecting into the bore atimsoitigen end 70 having inwardly directed shoulders 66 and corresponding at its outer end 72 stirnaeitigen shoulders 68th The inner sleeve 7 ^, which has an outwardly directed shoulder 76 on its inner end 78, is slidably arranged in the outer sleeve 6k, in such a way that the shoulder 76 lies between the shoulders 66 and 6 * 8 of the outer sleeve 6k on the inner end 78 of the Inneüküls® lh a sit2: surface 80 is provided. Between the shoulder 68, which in the illustrated embodiment is formed by a ring inserted into the outer sleeve 6k , and the shoulder 76 on the inner face 78 of the inner sleeve 6k , a biasing spring 82 is provided which pretensions the inner sleeve 7 ^ g & g% n the shoulder 66 . If necessary, an O-ring 53 can be provided in order to hold this supply seat assembly k8 after it has been set in the desired position. This design achieves a position of the seat 80 which can be adjusted under the effect d9T of the ball k6 on the seat 80, which, if necessary, enables a larger stroke of the ball k6 to achieve the highest possible exit capacity.

In the embodiment according to FIG. 2, the inner end kk of the bolt J6 has a conical shape. The outlet seat kO has a throttle surface 8 * t in the bore lh with a bevel adapted to the tapered end kk of the bolt 36. The exit seat kO also has a shoulder 5k which is generally arranged so that the ball 46 comes to rest against it when the diaphragm

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membrane 22 as a result of a decrease in pressure P in the ent distant sub-compartment 26 relative to the pressure P ^ in the adjacent or adjacent sub-compartment 24 is deflected in one direction.

The operation of the return flow relay according to the invention is described below. The diaphragm membrane 22 responds to the difference between the pressure P in the distant sub-compartment 26, which can be regarded as a control pressure, and the pressure P _ft in the adjacent or adjoining sub-compartment 24 causes an adjustment of the bolt 36, which is in contact with the Drosael ball 46 and adjusts it upwards or downwards when the membrane 22 is deflected upwards or downwards. The membrane 22 is deflected downwards with an increase in the pressure P _A "which may be related to the supply pressure P in the supply line 30 as shown in FIG 24 is connected to the atmosphere via the ventilation duct 34 in such a way that the pressure P ^ is essentially a constant reference pressure, namely atmospheric pressure. The downward adjustment of the ball is limited by the supply seat assembly 48 and accordingly the upward adjustment of the ball 46 is limited by the shoulder 54 on the outlet part 40. when this rests on the feed seat 48, for example on the seat surface 80 of the feed seat device 48, the flow through the relay valve is blocked. In the upper position of the ball 46, i. E. when this rests against the shoulder 54 and in the embodiment shown in Fig. 2 the inner end 44 of the BoI-

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sen® touches the drop surface Sk de * Auatrittaaitses 40, the flow through the relay valve into the outlet channel 20 has its maximum value. With the central adjusting rods of the ball k6 “between the supply position 48 and the outlet seat kO , a certain amount of fluid flows through the exit seat kO and thus to the outside via the vent 3k. The position of the supply sitees k & £ @ t adjustable in such a way that the full adjustable stroke of the ball k6 sur Srsielung a

and drain bsw · pump speed rat © ^G ) is adjustable. The small cross section of the case of "zez & s 36 a grcßen Freiraura opposite the FlEisSa® ensured 8k aur achieve a high Auatrittakapasit t j di" each adapted Sohrägflachen at the end kk of Bolzes "36 and the Droeselfläche 84 ensure» ine centering of Bolzene 36 in the outlet ! tas kO ₉ when the "It ^ gel H6 rests against the shoulder 5k in such a way that innotAalh the operating range of the boss 36 does not rub and! its hysteresis is reduced"

The / mordsmng and design is such that the steady state of the output pressure P _{in the output "kaRsI 20" decreases with an increase in the pressure P Q} in the distant T7nt ©? Abt®il 26. In the normal operating range, where F can vary from 3-15 US pounds per square, with a feed pressure P of 20 US »pounds per square, the ball k6 will only move slightly and at no time against the exit point kO or the Infeed-8it & k & 3ur plant come. In a typical practical embodiment, P is variable from about 3.5-3.0 pounds per square inch, and P varies depending on

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The rate of 3-15 US pounds per square inch slides is the general mode of operation of the device shown in FIG. If P is reduced significantly below its normal operating range, for example by opening the unit consisting of flap 60 and nozzle 62 to the maximum, then ball 46 comes to rest against shoulder 54 on outlet surface 40 and locks in cooperation with it the end face 44 and the Droesel surface 84 the outlet flow into the adjacent or adjacent lower * compartment 24. Conversely, if P rises significantly above its normal operating range, the ball 46 comes into contact with the supply channel 48, whereby the feed pressure P _{9 is} switched off and the passage cross-section through the outlet port 40 is increased to achieve the maximum outlet flow capacity.

The maximum inlet and outlet capacities are radio * functions of the overall distribution bxw. of the total hump of the ball 461 therefore the adjustability of the position of the feed seat 48 are used to set the maximum supply and exit capacity. The elastic, yielding training of the supply unit 48 in FIG. 2 can serve if necessary, ensure the highest possible exit capacity.

The embodiment according to Fig. 1 is particularly simple * and ensures, due to the few parts and the large clearances, a largely trouble-free

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drives For "most applications" the combination of the operating parameters that could be obtained from this version is sufficient stiffness of the diaphragm membrane 22 ναού of the previous version of the ball k6 determine the ice reinforcement. The discharge »bsw» tapping speed and the supply »and exit« capacity depend on the dimensions of the ball and the bore as well as the length of play between the Bolsetx 36 and the Sits kO wio also on the setting of the ball stroke, as for the Fao & n & nn without another "he ·· W clear if the Bolaan 36 at the Sits 40 or the bore 14 rubs, as thereby the hysteresis of the relay" plants increased 'is'.

The embodiment according to FIG. 2 enables the greatest possible reduction in drainage. Tap speed during operation without loss of supply and exit capacity. If a tap speed is required, this construction is to be preferred, although the smaller clearances and the larger number of parts make the maintenance of this embodiment more difficult The natural spring action of the Meabran 22 adds a tension force. This allows the OiaphragSJia rigidity to be reduced in order to achieve an optimal linearity of the dependence of the output variable on the input variable EU. The flap 60 _t the nozzle valve 62 and the Dros "selstelle 58 are often used in devices with Kraftvergleieh such as a" differential pressure transmitter with power-yer "used interchangeably. The Droseeletelle 58 is usually built into the base of the heater, while the assembly of flap έθ and nozzle 62 den. The position detector forms, which controls the input pressure Ρ _Λ for the relay, whereby the atts-

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output pressure P _{Q the} relay has a return bellows in order to maintain the force comparison applied *

The above-described examples of the invention serve only for explanation, without giving them a «· should be of restrictive importance.

Patent claims:

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Claims (1)

Claims TMs®hr relay valve, marked dnjf © ht a housing (1O) | a center wall (12) in dom housing, vtlohe the housing in a first (16) ua2 divides a second (18) section or compartment and a central bore (i4) which di © both sections or compartments (i6, 18) as well as «i-" n © a from the bore (i4) through the housing (1O) running outlet channel ζ20) connects} a pressure-sensitive diaphragm arranged in the first section or compartment (i6), which divides the first compartment (1) into a first sub-compartment (2 *) adjacent to the middle wall (12) or adjacent to it. t) w & a divided into a second sub-compartment (26) from the middle wall (12)} device * (27, 2i) with connection of the remote sub-compartments (26) with a power supply} device ^ 30 ) xuv connection of the second section bsw. Compartment (18) old ice and washer fluid supply has a ventilation duct (3 ^) which connects the neighboring or adjoining subcompartment (2k) with the airway; a BoI- (36), which is in operative connection with the diaphragm (22) at its one end (38) and extends from the diaphragm through the neighboring or adjoining base (24) into the one on one side of the access passage channel (20 ) located part of the central bore (ih) extends into} an exit point (40 "Fig. 1t 5 *" Fig. 2) on the surface of the central bore (14) 109851/1109 between the outlet channel (20) and the adjacent or adjoining lower part (2U) f «ine in the central bore (iU) below the Auatrit.tsaltzea (UO) io ta Diaphragm * β (22) in one direction as a result of a pressure drop in the distant sub-compartment (26) compared to the pressure in the adjacent or adjoining sub-compartment (2U) to rest against the seat (kO \ $ k) "lea the outlet aitaea and here the connection «wipe the neighboring bsw. adjoining sub-compartment {2h) on the one hand and the outlet channel (20) and the 'white section or compartment (18) on the other hand, while when the diaphragm (22) is deflected in the opposite direction, this connection opens? one in the central bore (lh) ! between the wide section (18) and the outlet channel (20) a supply aits (^ 8) »against which the ball comes to rest, blocking the connection with the second section (18), when the bolt (36) As a result of an increase in the pressure (P) in the distant sub-compartment (26) relative to the pressure (P) in the adjacent or adjoining sub-compartment {2k ) protrudes deepest into the central bore (14) and the ball (h6) against pushes the feeder (U8) and devices (50, 52, 53) to adjust the distance between the feeder (48) and the outlet! * »(40; 5 * 0 to control the gain and the capacity of the heater. 2, reversing relay valve according to claim 1, characterized in that net that between the endo (38) connected to the diaphragm (22) of the bolt (36) and the middle wall tang (12) 109851/1109 • Provided in the spring preload element (56, Fig. 2). 3. reversing relay valve according to claim 1 or 2, characterized in that that the Strönningsmltteleintrittsleltung (28, Fig. 2) EU the removed sub-compartment (26) with the Fluid feed line (30) connected iat and one Has throttle parts (58), such that the pressure in the distant sub-abbot (26) in a relation «u the pressure of the flow central supply line (30) is » k. Reversing relay valve according to one or more of the preceding claims, characterized in that means (60, 62, Fig. 2) for controlling the pressure (P) are provided in the remote sub-compartment (26). 5. reverse relay valve according to claim _t h · net gekennzeloh characterized in that the device for controlling dea pressure in the remote sub-compartment (26) comprises an aggregate of a nozzle (62) with an associated flap (60). 6. reverse Helalsventil to one or more constitute front · »· claims, characterized in that the device star distance adjustment between the Zufunrund the exhaust seat cooperating screw thread (50, 52) on the wall of the bore (IFC) and the Zufuhrsitssteil ( ** 8) has « 7. Reversing «relay valve according to one or more of the preceding Claims, characterized in that the auxiliary seat (^ 8, diagrams 2 and 3) has the following parts! 10 9 8 51/110 an outer sleeve (64) adjustable in the central bore (14) with radially inwardly directed shoulders (66 ₁ 68) at both of its front ends; an inner bushing (7 * 0 with a radially outwardly directed shoulder (76) on its inner inner end (78), whereby this shoulder (76) lies between the shoulders (66, 68) of the outer sleeve (64) and the inner sleeve (74) slidably displaces its seat surface (80) on the inner end face (78) relative to the outer sleeve (64) ) the inner sleeve (74)} a pre-tensioning spring (82) between the shoulder (68) on the outer inner end (72) of the outer sleeve (64) and the school gate (76) on the inner front end (78) of the inner sleeve (74), in such a way that the biasing spring (82) biases the inner sleeve (74) to rest its shoulder (76) & n the shoulder (66) on the inner inner end (70) of the outer sleeve (64) 8. Reversing relay valve according to one or more of the preceding claims, characterized in that the end (44, Fig. 2) of the bolt (36) projecting into the central bore (i4) is frustoconical and that the outlet seat has the following parts Throttle surface (84) on the inner wall of the central bore (i4) with a bevel adapted to the conical β tumpfftSrmigen end (44) of the bolt (36), as well as a shoulder (54), gmgon which the ball (46) during the deflection of the Diaphragm (22) in one direction due to a decrease in pressure (P) in the distant lower compartment (26) versus the pressure (P) in the adjacent el th or adjacent lower tail (24) comes to rest 109851/1 109