JPH01214910A - Flow control valve - Google Patents

Abstract

PURPOSE: To easily adjust a 2nd constriction point and to enable the adjustment result to be seen from outside by connecting a rotary insert body, which has the 2nd constriction point formed of recessed parts on its peripheral wall concentrically with the axis of the valve to a servo element housing. CONSTITUTION: The 2nd constriction points 13 is formed of the recessed parts 11, 11' and 11" in the peripheral wall 10 of the rotary insert body 8 concentric with the valve axis, the recessed parts cooperate with an opening 12 in a valve housing 1, and the servo element housing 14 is connected rotatably to the valve housing 1 and fixed to the rotary insert body 8. Then the rotary insert body 8 is rotated by the servo element housing 14 to set different section to the 2nd constriction point 13. Therefore, a different limit value is obtained and a set flow rate can be read out of the rotational position of the servo element housing 14. Consequently, the 2nd constriction point can easily be adjusted and the adjustment result can be detected from outside.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides a method in which the throttling point formed by the valve seat and the closing member is in series with an adjustable second throttling point, and the valve housing connected to the closure member by a rod;
connected to a servo element, such as a diaphragm, which is subdivided into two pressure chambers by a movable dividing wall, the pressure chambers being guided to pressure measurement points before and after the second throttling point; The present invention relates to a flow regulating valve which is connectable to respective passages, one of the passages extending through the valve stem to an internal pressure measurement point.

(Prior Art) Such a flow control valve is disclosed in German Patent Application No. 2315
It is known from No. 045. The servo element is biased by the pressure drop across the second restriction. The valve thus acts as a flow regulating valve which limits the maximum flow to a certain value by setting the second throttling point.

The second throttle point is formed by a helical spring, which is arranged coaxially with respect to the valve seat on its side remote from the closing member and is compressible by means of a set screw. The latter changes the gap width between the helical turns and thus the drawing cross section.

A servo element housing is secured to the valve housing. One of the pressure chambers of this servo element housing is
It is connected to a pressure measuring point in the helical spring via a passage extending through the valve stem. The other pressure chamber is connected to a pressure measuring point beyond the helical spring via a conduit extending outside the housing. A relief bellows extends between the dividing wall of the housing and a base of the bellows connected to the valve stem. The chambers on either side of this bellows are connected via passages to the chambers on either side of the first constriction point. This is intended to relieve the pressure of the closure member and thus to compensate for pressure fluctuations.

In known flow control valves, the second throttling point and thus the desired maximum flow rate can only be changed using a set screw tool. The range of change cannot be detected from the outside. This is because the valve is integrated into the heating device to serve as a branch valve in parallel branches of the vibrator and is supplied in such a way that a pressure equilibrium is obtained within the heating device, i.e. in all branches. This is particularly disadvantageous if the unit to be used must always be supplied with a sufficient amount of water during normal pressure conditions. Furthermore, it is a nuisance that the pressure signal conduit is led from the valve housing to the servo element housing.

DE 1261722 discloses a rotating insert (r) concentrically with the valve axis for the purpose of flow presetting.
A radiator control valve is disclosed in which the peripheral bore of the radiator control valve is provided with a second throttling point defined by at least one recess and an opening in the valve housing cooperating with the peripheral wall. The rotating insert has a top carrier that is engageable by a spanner and a scale that cooperates with markings on the valve housing.

(Problems to be Solved by the Invention) The present invention provides for easier adjustment of the second aperture point,
The object of the present invention is to provide a flow valve of the above type, the result of which is visible from the outside.

(Means for Solving the Problem) This problem is characterized in that the second throttling point is formed by at least one recess in the peripheral wall of the rotating insert concentric with the axis of the valve, and the recess is located in the valve housing. and in which the servo element housing is rotatably connected to the valve housing and fixed to the rotating insert.

By using a rotating insert and connecting it to the servo element) a very easily adjustable second throttling point is obtained. - No tools required for boat fishing. Instead, it is only necessary to grasp the servo element housing and turn it for the purpose of setting. The rotational position is at the same time a measurement of the cross section of the opening or the set flow rate.

There are many possibilities for forming the recess. For example, the peripheral bore can include multiple recesses of different cross-sections. However, the peripheral wall can also include only one recess whose height varies in the peripheral direction. In all cases, rotation of the servo element housing results in a change in the effective cross section of the second throttle point opened by the housing opening.

Preferably, the valve stem is connected at one end to a pressure measurement point within the rotating insert and at the other end to an axial point connected to a pressure chamber in the servo element housing remote from the closure member. Including aisles. Such an axial passage can easily be provided in the valve stem.

In a particularly simple embodiment, the valve stem has at one end a thread for screwing into a hollow nipple passing through the dividing wall and at the other end a threaded spigot connected to the closure member. It is formed by a tube having a wall opening provided near it with a thread for screwing into the tube.

Furthermore, the pressure chamber of the servo element housing facing the closure member extends to the rotating insert and includes a first passageway portion between the rotating insert and the servo element as well as a second passageway in the valve housing. It is recommended that the part be connected to an internal pressure measuring point outside the rotating insert. In this manner, the second passageway may also extend completely within the housing. A very solid structure is obtained.

The first passageway portion may for example be formed by at least one groove on the outside of the rotating insert. Another possibility is that the servo element housing and the rotating insert are connected to each other by axially extending teeth and grooves,
and an extension where the groove extends beyond the cross-section of the tooth.
It has a large size. In either case,
Only very little additional fabrication is required.

Particularly good indication is obtained if a scale and a pointer are provided on the servo element housing and the valve housing.

Furthermore, the servo element housing may be provided with a protrusion to serve as a grip for rotation, which facilitates adjustment. The projections can also serve as guides.

In a preferred embodiment, on the side of the valve seat remote from the rotary insert, there is a bore in which a compensating piston connected to the closing member engages, and a passage in the valve housing is provided from the closing member. It is ensured that the chamber on the side of the remote compensating piston is connected to a chamber located outside the rotating insert.

By simple means and without additional passages in the valve stem, a compensating device is obtained which compensates for the effects of pressure fluctuations in the closing member.

Additionally, the pressure chamber of the servo element housing facing the closed illumination material can be selected for an internal pressure measurement point outside the rotating insert or, for connection to an external pressure measurement point, for an external pressure connection. It is advantageous to be connectable.

One and the same valve can therefore be used selectively as a flow regulator or as a differential pressure valve. for example,
The latter allows the pressure difference between the supply branch and the return branch of the heating device to be kept constant. Therefore, a single valve is sufficient as a branch control valve selectively regulated by flow rate or pressure difference.

In a preferred construction, a bore passing through the wall of the valve housing opens into a connecting chamber between the first and second passage parts, and a closing plug closing the second passage part is provided in this bore; Or a connecting nipple can be selectively inserted. By using a closing plug, a flow regulating valve is obtained, and by using a connecting nipple, a differential pressure regulating valve is obtained.

The invention will be explained in more detail with reference to preferred embodiments illustrated in the drawings.

(Example) The flow control valve shown in FIG. 1 includes a valve housing 1 having a chamber 2 on the supply side and a chamber 3 on the discharge side. A closing member 4 connected to a valve stem 5 cooperates with a valve seat 6. This forms the first aperture point 7. A rotating insert 8, which bounds an internal chamber 9 surrounding the closure member 4, is inserted into the bore concentrically with the closure member.

The peripheral wall 10 of this rotating insert 8 has recesses 11, 11'
.

11', which, together with the opening 12 of the valve housing 1, form a second throttle point 13 in series with the first throttle point 7.
form.

The servo element housing 14 comprises an upper part 15 and a lower part 16, between which a diaphragm 17 is clamped, serving as a dividing wall. Closing member 4
On the side remote from , there is a first pressure chamber 18 connected via a passage 19 in the valve stem 5 to a wall opening 20 near the connection of the closure member 4 and with a first pressure measurement point 21 . is forming.

The pressure chamber 22 on the side facing the closure member 4 extends to the rotating insert 8 and is provided with a biasing spring 23 which loads the valve in the opening direction. The lower part 16 has a sleeve-like part 24 overlapping the rotating insert 8 and fixed thereto. An annular chamber 26 in the valve housing 1 abutting the valve housing 1
There is a passage section 25 which is led to. From here, a second passage section 27 leads into the chamber 3 on the discharge side. In the mouth part a second pressure measurement point 28 is formed, which is connected to the second pressure chamber 22 via the channel parts 25 and 27 and the annular chamber 26 .

The rotating unit consisting of the servo element housing 14 and the rotating insert 8 is held in place by a threaded sleeve 29 and an abutment ring 30, with a sealing ring 31 sealing against the outside. It is provided for.

The flow through the second restriction point 13 is caused by pressure measurement points 21 and 2.
8 acting on the diaphragm 17. Once a predetermined value determined by the spring 23 is exceeded, the closing member 4 moves in the closing direction such that the set flow rate is not exceeded.

Rotating insert 8 with the help of servo element housing 14
By rotating , different cross sections can be set for the second aperture point 13 .

Different limit values are therefore obtained. As explained below, the set flow rate can be read from the rotational position of the servo element housing 14.

The closing piston 32 can be pushed into the interior of the servo element housing 14 by means of a screw 33. It therefore forms a locking device, by means of which e.g.
When the relevant branch of the heating device has to be emptied, the closing member 4 can be brought into the closed position.

FIG. 2 shows that only one recess 111 is connected to the surrounding wall 111.
a modified rotating insert 108 which differs from FIG. 1 in that its height increases circumferentially;
2 illustrates an embodiment showing . This again,
In cooperation with the housing opening 12 a variable passage section can be achieved for the second throttle point 13.

In the embodiments of FIGS. 3-6, corresponding parts are designated by reference numbers increased by 200. Servo element housing 214 is fixed for rotation with rotating insert 208 via gearing. As shown in FIG. 5, the teeth 234 on the sleeve 224 of the servo element housing 2]4 are engaged within complementary grooves 235 of the rotating insert 2'08, all of which are attached to the sleeve 23G of the servo element housing 2'08.
surrounded on the outside by The groove 235 extends beyond the cross-section of the tooth and forms the first passageway portion of the augment 22.
Contains 5. These recesses 225 are also included in the sleeve 224.
and continues at the leg of ring 236.

The valve stem 205 has a screw 2 for inserting the nipple 238.
37 at its upper end. The nipple passes through diaphragm 217 and is in communication with upper pressure chamber 218. Piston rod 2
At the lower end of 05 there is a screw 239 for screwing into a threaded spigot 240 connected to the closure member 204.

The closing member 204 has a compensating piston 2 engaged in a bore 243 of the valve housing 201 via an extension 241.
42. The piston diameter is equal to the valve seat diameter. The chamber 244 below the compensating piston is connected via a housing channel 245 to the chamber 203 on the discharge side, which contains the pressure measuring point 228 . Automatic pressure compensation of the closure member 204 is thus obtained.

The valve housing 201 or sleeve 229 is provided with an attachment 246 having a scale graduated m''/n, as shown in FIG.
14 is equipped with an attachment 247 having a protrusion 248 as a grip for rotational purposes. One radial projection 249 serves as a pointer for cooperation with the scale. Two attachments 246 and 24
7 are guided concentrically with respect to each other such that the axial ridge 250 of the attachment 246 engages in the annular groove 251 of the attachment 247. The bore 252 in the valve housing 201 is as shown in FIG.
A closure plug 253 is provided. Such a valve
It operates as a flow control valve similar to the valve shown. However, instead of such a closing plug 25'30, a connecting nipple 254 of FIG. 3 can also be screwed into the bore 252. In this case, an external connection point 255 is obtained through which a connection to an external pressure measurement point can be made. The connecting nipple 254 closes the mouth of the housing bore 227, so that the internal pressure measurement point 228 becomes ineffective. In this way, a pressure differential regulating valve is obtained, by means of which a flow through one branch can be created by the pressure difference between the supply pressure and the return pressure. The force of spring 223 is 0
．． This corresponds to a pressure of 1 bar. This is the value normally desired between the supply and the return of the heating installation. If a different pressure difference must be maintained, the spring 223 can be replaced.

Two nipples 256 and 257 at the bottom of the valve housing 201 are for connecting measuring devices or
Can be used to empty one branch.

Spring 223 rests on a support ring 258 that loads a sealing ring 259 for sealing valve stem 205. This support ring has a recess similar to recess 225.

[Brief explanation of the drawing]

1 is a longitudinal section of a first embodiment of a flow regulating valve according to the invention; FIG. 2 is a modified shape of the rotating insert; FIG. 3 is a differential pressure regulating 4 is a longitudinal section of a second embodiment of a flow regulating valve according to the invention connected as a valve; FIG. 4 is a partial longitudinal section of a modified valve connected as a flow regulating valve; FIG. Yes; Figure 5 shows A- in Figure 3.
6 is a plan view of the structure of FIG. 3; FIG. 6 is a cross section taken along line A; FIG. 2900 Chamber 4...Closing member 5...Valve stem 6...Valve seat 8...Rotating insert 9...Inner chamber 11, ll', 11'...Recess 13...Upper part 14... Servo element housing 17... Diaphragm 18... First pressure chamber 20... Wall opening 22... Pressure chamber 23... Spring 26... Annular chamber 27... Second Passage 28...Second pressure measurement point 29...Sleeve 30...Abutment ring opening-

Claims (13)

[Claims] (1) The throttle point formed by the valve seat and the closing member is
in series with the adjustable second throttling point, and the valve housing is subdivided into pressure chambers by a movable dividing wall, such as a diaphragm, connected to the closure member by a valve stem, said pressure chamber are connectable to respective passages leading to pressure measurement points before and after the second restriction point, one of the passages extending through the valve stem to the internal pressure measurement point, Second aperture point (1
3; 213) is a rotating insert (8; 10) concentric with the valve axis.
8; 308) by at least one recess (11, 11', 11''; 211) in the peripheral wall (10; 210), which recess cooperates with the opening 12 in the valve housing. and a servo element housing (14;
214) is rotatably connected to the valve housing (1; 201) and fixed to the rotating insert. (2) The peripheral wall 10 has a plurality of recesses (11
, 11', 11''). (3) The flow control valve according to claim (1), wherein the peripheral wall 110 includes a recess 111 whose height increases in the peripheral direction. (4) the valve stem (5; 205) is connected at one end to a pressure measuring point (21; 221) in the rotating insert (8; 208) and at the other end to the closing member (4; 204
) separate from the servo element housing (14; 214
Flow regulating valve according to any one of claims 1 to 3, characterized in that it comprises an axial passage (19; 219) connected to its pressure chamber (18; 218) of the valve. (5) Screw 2 for screwing the valve stem 205 into the hollow nipple 238 passing through the dividing wall at one end;
37 and, at the other end, a spigot 239 for screwing into a threaded spigot 240 connected to the closure member 204 and having a wall opening 220 near the spigot. Flow control valve according to any one of claims (1) to (4). (6) the pressure chamber (22; 2) of the servo element housing (14; 214) facing the closure member (4; 204);
22) extends to the rotating insert (8; 208) and includes a first passageway portion (25; 225) between the rotating insert and the servo element housing as well as a second passageway portion in the valve housing (1; 201). Passage part (27
227) to an internal pressure measuring point (28; 228) on the outside of the rotating insert. (7) The flow regulating valve according to claim (6), wherein the first passage portion 25 is formed by at least one groove on the outside of the rotary insert 8. (8) Servo element housing 214 and rotating insert 20
8 are interconnected by an axially extending tooth 234 and a groove 235, said groove comprising an extension 225 beyond the cross-section of the tooth. Flow control valve. (9) The scale and pointer 249 are connected to the servo element housing 2
14 and on the valve housing 201. Flow control valve according to any one of claims (1) to (8). (10) The flow control valve according to any one of claims (1) to (9), wherein the servo element housing 214 is provided with a protrusion 248 as a grip for rotation. (11) The side of the valve seat 206 remote from the rotating insert 208 is provided with a bore 243 that is engaged with a compensating piston 242 connected to the closure member 204, and the passage 245 in the valve housing 201 is 11. Flow control valve according to claim 1, wherein the chamber 244 on the side of the compensating piston remote from the closing member is connected to a chamber 203 arranged outside the rotary insert. (12) The pressure chamber 222 of the servo element housing 214 facing the closure member 204 is connected to the rotating insert 280.
Any one of claims 1 to 11, which is selectively connectable to an external pressure connection 255 for the purpose of connecting to an internal pressure measurement point 228 or an external pressure measurement point outside of the Flow control valve described in . (13) A bore 252 passing through the wall of the valve housing opens into the connecting chamber 226 between the first passage section 225 and the second passage section 227 and closes the second passage section. Closing plug 253 or connecting spigot 254
The flow control valve according to claim 5 or claim 12, wherein the flow control valve is selectively insertable into the bore.