NO127568B - - Google Patents

Description

Riser valve with throttle valve for radiator systems.

In patent no. 94966, it has already been proposed to combine several valves into a single unit which are necessary for certain types of risers in radiator systems. The combined valve units in question find a special application in cases where so-called central heating systems have been introduced for larger housing complexes, as several risers are often fed with hot water from one and the same boiler at a considerable distance from each other.

Thus, by what was previously proposed

assembly of riser valves, there is a combined throttle and shut-off valve, which enables good sealing in connection with other devices that provide good regulation characteristics and with an additional device to automatically stop the valve's opening movement at the moment when a pre-set throttle position is reached, as well as a drainage facility and drain for the drained water.

The throttle valve's purpose is once and for all to set the valve's maximum opening so that when the valve is fully open, the riser in question will receive a quantity of hot water that is in thermal balance with the quantities of hot water that are simultaneously supplied to other risers connected to the same plant.

In those cases when the temperature year

around should be uniform throughout the building that is heated with the help of the system, a system also works in which all risers have been provided with riser valves of the type specified above

type, in a very satisfactory way. In such cases, when in a certain season or under certain conditions you will be able to raise or lower the temperature in certain parts of the building, e.g. such parts that contain more rarely used meeting rooms,

storage rooms or the like, it will be necessary to readjust the throttle valve in the riser-line valve assembly for those of this

riser fed localities' changed heating needs. Of maneuvering techniques

reasons, it then also becomes desirable at the same time to readjust the so-called preset, i.e. the organ by means of which the maximum opening of the throttle valve is set once and for all. Experience has shown that it is very difficult partly when, for example, a reduction of the heat in the mentioned premises below normal, thereby establishing the desired new position for the pre-setting organs, partly also when returning to normal conditions to find out the original pre-setting, which has been painstakingly experimented with.

Should an incident or accident, e.g. an unintentional mismaneuver, the preset is lost, then there are equally great difficulties in re-setting it. This is primarily due to the lack of an effective measuring instrument for measuring the liquid that flows through the valve.

It can also happen that when the riser valve is adjusted, the entire system is thrown out of balance in such a way that the other riser valves must also be adjusted. In this case too, it is of great importance that one not only provides the new preset, but also can reset the original preset on a later occasion.

The present invention relates to a device by which this becomes possible in a simple and reliable way. According to the invention, a manometer for measuring the pressure difference is connected on each side of the throttle valve to the valve assembly common to all riser valves. The throttle valve has a fixed characteristic in the setting, which means that the pressure drop across the throttle valve for each particular setting of this, leads to a given resistance figure, or in other words by giving pump pressure in the system both the pressure drop across the throttle valve and the water flowing through the throttle valve -quantity clearly depends on the valve setting and is therefore in the given relationship to each other, which can be recorded in the form of a calibration curve. One can then read off any of the three sizes, the valve setting, the pressure drop and the amount of liquid flowing through this curve. The other two can then be read out by guiding one of these quantities directly from the calibration curve.

Thereby, it is also very easy to provide a certain preset for the throttle valve at any time with the guidance of a known value for either the pressure drop or the desired amount of liquid flowing through.

However, the connection of the manometric instrument becomes particularly difficult with such a compact valve construction as the one mentioned above, and according to a special embodiment of the invention, the valve assembly is therefore provided in advance with suitable coupling sleeves for the manometer. These sleeves are arranged parallel in the horizontal plane, however, so that one lies above the other, and one is connected to the branch of the valve assembly that is intended for connection to the supply line from the boiler, while the other is connected to a branch of the valve assembly which is intended to be connected to the riser. Each of the connection sleeves contains a coaxially arranged valve, whereby a connection can be provided between the relevant branch in the riser valve assembly on the one hand and a suitable line to the manometer on the other hand.

The invention will now be described in more detail with reference to the attached drawing, which shows an embodiment of the invention.

The valve construction is mainly arranged as a secondary cross. In the lower right corner, the connection 10 for the supply line from the boiler is arranged. In the lower left corner is the steering wheel 11 for the combined shut-off and throttle valve. In the upper right corner, the connection 12 for the riser is arranged, and in the upper left corner a square pin is arranged for regulating the drain valve 13, whose outlet is directed straight out to the left in the form of the pipe connection 14. You will immediately see that the three organs, which the machinist needs to be able to get to, namely the steering wheel 11, the square head 13 and the pipe connection 14, lie in the same plane, which will be directed straight out of the wall along which the ladder cable is drawn. Because of this, all three organs will be easily accessible, and one does not need to have a special left-hand construction and right-hand construction to cover the various needs for accessibility, which otherwise often occur with valve constructions, depending on whether the riser is drawn on a straight wall or in a corner, resp. whether the corner is a left corner or a right corner.

It is an advantage if the valve construction is placed some distance up on the wall, as unauthorized persons are thereby less tempted to maneuver the valves. Such a placement is possible while maintaining the maneuverability of the valve. The shut-off valve will be facing downwards, which is why it is easily accessible. The drain valve, which is directed upwards, is somewhat more difficult to access. The pipe connection 14, to which a hose is connected when draining, is arranged straight out from the wall, which is the most advantageous.

A cylindrical hole is occupied in the intermediate wall 15, in which a cylindrical valve body 16 is arranged to be displaced in the axial direction during the valve's maneuvering movement. A profile groove 17 is arranged through the valve body 16 in the radial direction. This groove is designed so that the resistance to flow through the valve varies as closely as possible linearly with the angle of rotation of the valve spindle 18 under the prevailing pressure conditions. On the side facing the valve shaft 18, the cylindrical valve body 16 is provided with a protruding flange. 19, adapted for engagement when the valve is closed with a corresponding groove 20 in the intermediate wall 15, which in some way will function as a valve seat for the shut-off valve function performing flange 19. With this device, it is achieved that the valve, when it is completely closed, also provides a good seal, but when it is partially open, by choosing the shape of the slit, 17 gives a suitable characteristic for the throat function.

The valve is equipped with a so-called preset. This means, on the one hand, that the throttle valve's setting is lost when the valve is adjusted, especially when it is closed, but that special devices are included so that this normal setting is automatically reset when the valve is fully opened. These devices consist of a locking device 21 arranged on the handle 11 and a disc 23 that can be locked by means of a locking ring 22, which supports a cam 24 cooperating with the locking device 21. The disc 23 is suitably provided with a cylindrical flange 25.

The device is consequently designed in such a way that, after closing the valve, the operator only has to open the valve again as far as it will go. The opening of the valve is stopped automatically when the locking device 21 comes into contact with the cam 24, and then the set value of the throttle valve has also been reset.

The drain valve provided with the square device 13 can also advantageously be of the type which has a cylindrical valve body 27 in contact with a circular valve seat 28 in much the same way as applies to the parts 19 and 20 of the shut-off valve. In order to prevent impurities from entering this valve, the opening for the connection of a hose or the like to divert the drained can normally be covered with a cover 29.

In the castings for the valve construction's form, there is in connection with the ones above on the right or lower right in the drawing shows a pair of projections 30 and 31, respectively, which are in connection with a further pair of valves. For purely casting technical reasons, it is appropriate to split the ag unit, so that the latter valves are united with the other part of the valve unit by a screw connection, but this, however, can only be regarded as a purely expedient consideration of a constructive nature. The essential thing is that both of the latter two valves are included in the valve assembly.

Both the two valves 32 and 33 can be of the same design and for that reason one 32 is shown in outer outline, while the other 33 is shown in section. The valve 33 consists of a check valve with valve seat 34 and check valve 35 in connection with a square head 36'. The space between the contact surface for the peephole 35 against the valve seat 34 on one side and the shaft gland 36" on the other side is in connection with a connecting piece 37. The corresponding connecting piece on the valve 32 is designated 38.

Both connecting pieces are intended to be connected to a manometer 39, which is schematically shown in the form of a mercury-filled U-tube of a known type. A scale 40 is arranged between both branches of the U-tube, on which a suitable graduation is arranged. In the simplest cases, this can be designed as a linear scale, in which case the pressure difference between the inflow and outflow sides of the throttle valve can be directly read. It is more advantageous, however, for a special calibration to make the scale 40 so that it indicates the amount of water that flows through the valve per time unit in a fixed ratio to said pressure difference.

In modern, complete heating pipe installations, you can count on thermometers or other temperature measuring devices being installed to measure both the water temperature of the riser pipe and the water temperature of the return pipe. With knowledge of the amount of water flowing through each riser, one can therefore easily calculate the total amount of heat indicated by the radiators connected to this riser, so that the calibration of the various risers using the manometer becomes extremely simple and easy case. The monometer can either be permanently connected to the connection bushings 37, 38 or be removable if it is desired to be able to connect to them. Before the manometer is removed, the check valves 32 and 33 must be closed, and after the renewed connection of the instrument these should be opened again.

The valve unit is primarily designed to be mounted against a wall on a

in such a way that the cut plane in the figure will be vertical and perpendicular to the wall. It is clear from the drawing that with the construction shown, the peepholes will thereby be located on the rear side of the valve assembly, which faces the wall. This is an advantage in that the peepholes are thereby particularly well hidden from unauthorized persons. However, there is no difficulty for the person who is provided with a special key adapted to the square heads to maneuver them. Should in a special case the distance between the valve assembly and the wall happen to be too small, a pipe, bent at a right angle, can then be connected between the connection knobs 30 and 31 on the one side and the valves 32 and 33 on the other side so-called angular bending,

aligned so that the valves protrude in mutually parallel directions which are also parallel to the plane of the wall just behind the valve assembly.

It is of particular importance that the manometer is graduated in exact accordance with the throttle valve's characteristic, so that it indicates the quantity of forward flowing water per unit of time. As a rule, this should not be possible with hitherto commonly used laryngeal valves, as their characteristics are not sufficiently accurate due to the construction of the valves in question. A throttle valve of the special type, comprising a cylindrical

valve body movable in a cylindrical hole

in an intermediate wall in the valve and through which a circumferentially directed profile groove 17 runs,

is, by difference from here, possible to produce to

a relatively cheap price, but still

with a precision that enables in advance

to draw up the scale on the manometer like this

that this matches exactly. Reason

this is that the groove 17 can be milled diametrically

direction through the cylindrical valve body and that such milling with special tools is one of the most reliable methods

for the provision of an extremely accurate

shaping. It has also been shown in practice

that the advantages of arranging special valve-controlled connections to a manometer in connection with a valve assembly of the type indicated in the introduction, do not

comes to its right other than in connection

with a throttle valve of the above mentioned

type.

Claims (4)

1. Combined riser valve according to patent no. 94966 which, within a common house, contains partly a combined throat- and shut-off valve (11, 15-20), with a special device that enables a good seal and with a further device to automatically stop the opening movement of the valve in that position, when a pre-set throttle position is achieved, partly also a drain valve (27, 28) and outlet for the drained water, characterized in that connection openings (30, 31) for a pressure gauge (39) are arranged immediately within the throat valve's throat point (15, 16) and on each side of this, which serves to measure the pressure difference front and back the throttle valve in the direction of the flowing water. 2. Ladder valve as specified in claim 1, characterized in that the valves (32, 33) are arranged in the connection openings (30, 31) to close both connections to the manometer. 3. Ladder valve as stated in claim 1 or 2, characterized in that the connection openings (30, 31) are arranged on the rear side of the valve, i.e. on the side of the valve that faces the wall when the operating means (11) for the throttle valve (15) — 20) are directed out from the wall in a plane perpendicular to the wall. 4. Riser valve as stated in any of the preceding claims, characterized in that the pressure gauge is provided with a scale (40) which is graduated in the amount of flowing water per unit of time and that the throttle valve (15-20) is of the special type that contains a cylindrical hole occupied in an intermediate wall, a cylindrical valve body (16) running in the hole and a profile groove running diametrically through the valve body (16).