NL1043120B1 - Ceramic purging valve for liquid or gas filters. - Google Patents

Abstract

Ceramic purging valve (8) on a filter (3) that supplies filtered fluid that is controlled by an external pressure pulse sent through a separate fluid line (9) to the purging valve and opens the purging valve for a limited purging time, the purging valve being a component ( 13a) with ceramic plate (14), part of a piston (13), which can move between two extreme and closed positions, wherein no fluid is passed through and one intermediate and open position in which the purging valve (8) does, for a short time, have a purging flow of fluid, which purge flow purge the filter (3) on which the purge valve (8) is mounted.

Description

Patent center

1043120

Application number: 1043120

Application submitted: January 16, 2019

Int. Cl .:

B01D 35/00 (2019.01) B01D 29/66 (2019.01) C02F 1/00 (2019.01) F16K 3/02 (2019.01) F16K 31/122 (2019.01)

0 Priority: 0 Patent holder (s): January 18, 2018 BE BE2018 / 5030 UNIMID, private limited company liability in Koekelare, Belgium, BE. 0 Application registered: July 25, 2019 0 Inventor (s): Guido Van de Moortele in Antwerp (BE). 0 Request published: 0 Authorized representative: 0 Patent granted: ir. H.J.G. Lips et al. In The Hague. July 25, 2019 0 Patent issued: July 25, 2019

54) Ceramic purging valve for liquid or gas filters.

57) Ceramic purging valve (8) on a filter (3) providing filtered fluid that is controlled by an external pressure pulse sent through a separate fluid conduit (9) to the purging valve and the purging valve opens for a limited purging time, the purging valve having a component (13a) with ceramic plate (14), part of a piston (13), which can move between two extreme and closed positions, wherein no fluid is passed through and one intermediate and open position in which the purging valve (8) does fluid purge flow, which purge flow purge the filter (3) on which the purge valve (8) is mounted.

NL B1 1043120

This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent corresponds to the documents originally submitted.

Ceramic purging valve for liquid or gas filters.

The present invention relates to a purging valve for a liquid or gas filter, which must be periodically purged to prevent clogging of the filter.

More specifically, the invention is intended to purge a pre-filter located upstream of an apparatus that uses a fluid or gas fluid and whose proper function as a filter can be maintained by periodically purifying the filter to purify the filter pores or filter meshes.

It is known that protective filters that stop impurities from a supplied fluid such as a liquid or a gas must be regularly purified so that their filtering action is not hindered by clogging of the filter by retained impurities.

Traditionally this is done by manually opening a purge valve at the bottom of the filter so that the fluid now flows through the purge passage of the filter so that the impurities can be flushed out of the filter.

The purging only happens if someone thinks about it or if the filter is clogged and no longer works. If no one is present to notice this and to open and close the purging valve at the appropriate time, this can compromise the entire application. The pressure drop across the filter in which the dirt accumulates increases and, after switching devices, insufficient flow can then be obtained.

The present invention has for its object to provide a solution to the aforementioned and other disadvantages in that it provides a purging valve on a filter that supplies filtered fluid, the purging valve being controlled by an external pressure pulse connected by a separate fluid line connected is sent with a water softener downstream of the filter to the purging valve and the purging valve opens for a limited purging time and the purging valve subsequently closes again.

Because a pre-filter is often placed for protecting an apparatus, for example a water treatment apparatus, which is autonomously and regularly rinsed and regenerated, use can be made of the pressure pulse which arises when the rinsing or regeneration starts and falls away upon termination. to control the purging valve as an external pressure pulse.

The purging valve comprises a piston chamber in which a piston moves, to which is attached a component of the purging valve that is moved by the piston between two extreme closed positions, wherein no fluid is passed through and one intermediate and open position in which the purging valve briefly transmits a fluid flow. which fluid stream purges the filter on which the purging valve is mounted.

After the pressure pulse has been terminated through the separate fluid line from the water softener, the piston is pushed back from the second to the first extreme and closed position by at least one compression spring which was compressed during the previous movement from the first to the second extreme and closed position. the moving piston.

The purging time is determined by the time during which the piston is in the intermediate and open position in which the purging valve allows purging fluid to pass.

The movement of the piston is faster with a higher pressure of the pressure pulse and slower if the pressure of the pressure pulse is lower.

- At higher pressure the purging time is therefore shorter and at lower pressure the purging time is longer.

- The purging volume remains virtually constant because the pressure of the control pulse is accompanied by the same pressure in the filter and at higher pressure of the driving pressure pulse the outflow speed of the purging volume is greater, and at a lower pressure of the pressure pulse the outflow speed is smaller.

An advantage of the purging valve is that by placing an obstruction in the separate fluid line of the external pressure pulse, the movement of the piston and thus the purging volume can be controlled.

A further advantage of the purging valve is that due to this type of movement of the piston, the fluid to be filtered cannot continue to drain away along the open position of the purging valve in that when the water pressure is too low, the purging valve is always closed by one or more compression springs. The value of this too low water pressure is determined by the force that the compression springs exert against the water pressure on the surface of the piston.

Another advantage of such a purging valve is that it is controlled mechanically only by means of a pressure pulse through the fluid and does not require an electrically operated member or electronic control.

The pressure pulse can come from a device that uses the filtered fluid and that generates a pressure pulse at regular intervals, such as the aforementioned water treatment device, but can also come from another device.

The purging valve consists of a moving ceramic part, being a plate provided with a perforation, which is displaced by the moving piston via a component relative to a stationary ceramic part, for example a disc with a second perforation, the purging valve being in the open state is the perforation in the moving ceramic part, is aligned with the second perforation in the stationary ceramic part and the purging flow can flow through both perforations.

A well-known advantage of these ceramic components is that they are wear-resistant, guarantee a long service life and seal well for liquids - but also for gases.

Another advantage of these ceramic parts is that they are hard and resistant to the contamination that is carried along with the purge stream from the filter.

With the insight to better demonstrate the features of the invention, a preferred embodiment of a purging valve according to the invention is described below as an example without any limiting character, with reference to the accompanying drawings, in which:

figure 1 schematically represents a purging valve according to the invention coupled to a fluid filter; figure 2 shows a cross-section and on a larger scale the purging valve indicated by F2 in figure 1 in a first closed state;

figure 3 shows figure 2 but now in the open state;

figure 4 shows figure 2 but now in a second closed state;

Figure 5 is a perspective view of a cross-section of the purging valve according to the invention parallel to the longitudinal axis of the purging line;

Figure 6 is a perspective view of a cross-section of the purging valve according to the invention perpendicular to the longitudinal axis of the purging outlet.

Figure 1 schematically shows a supply line 1 of a fluid 2, provided with a pre-filter 3 and an apparatus 4 that processes the fluid. The pre-filter 3 is provided with a manual shut-off valve 5 and a filter mesh 6, placed in a detachable housing 7. The pre-filter 3 is provided at the bottom with a purging valve 8 which is connected to the device 4 via a second conduit 9 for fluid.

Figure 2 shows on a larger scale a cross-section of the purging valve 8 parallel to the longitudinal axis of the purging valve 8, in which case the purging valve 8 is in a first extreme and closed state. The purging valve 8 consists of a coupling piece 10 which can be attached to the pre-filter 3 at the bottom and which is provided with a piston chamber 11, which opens onto a second coupling piece 12 which is connected via a second fluid line 9 to the device 4 and in which a movable piston 13, which is connected to a component 13a attached to the movable piston 13 and in which a ceramic plate 14 is provided, which is provided with a perforation 15 and is moved relative to a stationary ceramic disc 16 provided with a second perforation 17. The ceramic plate 14 is driven by the piston 13, the purging valve 8 in this case being in a first closed state, the second perforation 17 being closed by a non-perforated portion of the ceramic plate 14 against which the perforated ceramic disc 16 is pressed 20 by means of a compression spring 18 via an intermediate support bush 18a and annular seal 19.

The movable piston 13 is held in this first closed state by in this case two compression springs 20, 20 '25 pressing against the movable piston 13 by expansion from a spring housing 21.

Figure 3 shows figure 2 but now in an intermediate open state, wherein the second perforation 17 of the ceramic disc 16 is aligned with the first perforation 15 of the ceramic plate 14 so that fluid can flow freely through the coupling piece 10 through the purging outlet 22 to purge the pre-filter 3.

Figure 4 shows Figure 2, but now in a second closed state, wherein the second perforation 17 is closed by another non-perforated part of the ceramic plate 14 against which the perforated ceramic disc 16 is pressed and the purging flow through the purging outlet 22 is closed. is going to be. The piston 13 is pressed against the wall 21a of the spring housing 21 which is opposite the second coupling piece 12 which is connected via a second fluid line 9 to the device 4 from which a pressure pulse exerts pressure on the piston 13. In this second closed state, the one or more compression springs 20, which exert a counter-pressure on the piston 13, are almost completely depressed and received in the spring housing 21. The ceramic plate 14 is pushed up to its extreme position in the spring housing 21 in this condition.

Figure 5 shows a cross-section of the purging valve 8 parallel to the longitudinal axis of the purging outlet 22. The purging valve consists of two screwed together housings: the cylindrical housing 23 for the moving piston and a spring portion 24 for the compression springs 20, 20 'of the piston and compression spring 18 of the ceramic disc 16. The two screwed casings 23, 24 are held together by four screws 25.

Figure 6 shows a cross section of the purging valve 8 perpendicular to the longitudinal axis of the purging outlet 22. On this the two compression springs 20, 20 'of the piston are almost completely compressed in the spring housing 21 which forms part of the spring section 24. The ceramic disk 16 with the second perforation 17 is clearly visible on this.

The operation of the purging valve 8 is very simple and as follows.

In a first extreme position, the purging valve 8 is closed and the movable piston 13 is held in this first closed state by two compression springs 20, 20 'which, due to expansion from a spring housing 21, press the movable piston 13 up to the head end of the cylindrical chamber

11. The movable piston determines the position of the component 13a that is attached to the piston and in which the ceramic plate 14 is located. In this first closed state, the second perforation 17 of the stationary ceramic disc 16 is closed by a non-perforated portion of the ceramic plate 14 so that no purging flow can flow through the purging outlet 22.

The device 4 receiving the filtered fluid, when it starts its regeneration or flushing, can send a positive pressure pulse to the purging valve 8 via the second fluid conduit 9 which runs from the device 4 to the purging valve 8.

The positive pressure pulse lands on the movable piston 13 via the second coupling piece 12 and pushes the movable piston in the direction of an intermediate position which is reached when the moving ceramic plate 14 reaches a position in which the perforation 15 of the ceramic plate 14 is aligned with the second perforation 17 of the ceramic disc 16, wherein the purging valve is in an open state and the purging flow flows through the purging outlet.

The positive pressure pulse pushes the movable piston 13 even further in the same direction, until a second extreme position is reached in which the purging valve 8 is again held in a closed state by the pressure on the movable piston 13 and in which the two compression springs 20, 20 'are completely pressed into their spring housing 21. In this second closed state, the second perforation 17 of the stationary ceramic disc 16 is closed by a second non-perforated portion of the ceramic plate 14 so that the purging flow can no longer flow through the purging outlet 22.

When the pressure pulse decreases or disappears, for example when the device 4 stops its regeneration or flushing, the piston is moved in the reverse direction by the depressed compression springs 20, 20 'which can now relax and push the piston 13 back to the intermediate position, which again is achieved when the ceramic plate 14 and the ceramic disk 16 reach a position where their perforations 15, 17 are aligned and the purging flow flows through the purging outlet 22 until the piston moves further past this intermediate position to the first extreme position of the purging valve 8, wherein the purging valve 8 is closed and no purging flow flows through it anymore.

The duration of the positive pressure pulse of the device 4 that receives the filtered fluid can be relatively long (10 minutes, 25 minutes) in relation to the purge duration, which can always be limited to two short moments at which a purge stream flows out of the filter 3.

The pressure on the second fluid line 9 can vary and produces a faster movement of the piston at a higher pressure and a slower movement of the piston at a lower pressure.

However, since the pressure of the control pulse is accompanied by the same pressure in the filter, the outflow rate of the purging volume is higher at a higher pressure of the pressure pulse and, at a lower pressure of the control pulse, the outflow speed is smaller so that the purging volume remains virtually constant.

By placing an obstruction 9a in the separate fluid line 9 of the external pressure pulse, the speed of movement of the piston, and thus the purge volume, can be controlled.

The purging valve 8 will return to a closed state if the pressure on the fluid line is too low or the pressure drops, because under the influence of the compression springs 20, 20 'the piston 13 with its component 13a and ceramic plate 14 will always return to its first extreme and closed position.

It goes without saying that the purge of the filter can be controlled so that the purging time is short, whereby a powerful jet of fluid, liquid or gaseous, is sent out of the filter 3, whereby the impurities can be flushed out of the filter and the filter 3 after this. can exercise its filtering effect again at the purge time and without the intervention of an operator or complex electrical automation.

It is also obvious that the external pressure pulse passes through a separate fluid line 9 to the purging valve 8

sent and device. abandoned, generated can be by another The current invention is no way limited to the if example described and in the figures displayed

embodiment, but a purging valve for liquid or gas filters according to the invention can be realized in all shapes and sizes without departing from the scope of the invention as described in the following claims.

Claims (5)

Conclusions. A purging valve (8) on a filter (3) providing filtered fluid, the purging valve (8) comprising a piston chamber (11) in which a piston (13) moves on which a component (13a) of the purging valve (8) ) which is moved by the piston (13) between two extreme and closed positions, wherein no purging flow is transmitted and one intermediate and open position in which the purging valve (8) does transmit a purging flow of fluid for a short time, which purging flow passes the filter (3) ) on which the purging valve (8) is mounted purges and wherein the purging valve is connected to a separate fluid line (9) with a water softener (4) downstream of the filter (3) through which a pressure pulse is sent to the purging valve (8) opens during a limited purging time and subsequently closes the purging valve, characterized in that a ceramic plate (14) with a perforation (15) is moved in the purging valve relative to a stationary ceramic disk (16) with a second perforation (17) by means of the piston (13) and the component (13a), the purging valve (8) being in the open state when the perforation (15) is in the moving The ceramic plate (14) is aligned with the second perforation (17) in the stationary ceramic disk (16) through which the purging flow can flow through both perforations (15, 17). Purging valve (8) according to claim 1, characterized in that the stationary ceramic disc (16) with a perforation (17) is pressed against the moving ceramic plate (14) by means of a compression spring (18), wherein between the compression spring (18) and ceramic disc (16), a support sleeve (18a) and an annular seal (19) are provided to prevent fluid leakage when the purging valve (8) is in a closed state. Purging valve (8) according to claim 2, characterized in that the pressure pulse sent to the purging valve causes the piston (13) to move in one direction until the piston cannot move any further, the purging valve 10 (8) moves from a first closed position over an open position and further moves to a second closed position, wherein the at least one compression spring (20, 20 ') is pressed against the piston (13) and the piston (13) against the wall (21a) of the spring housing (21) moves. Purging valve according to claim 3, characterized in that when the pressure pulse sent to the purging valve (8) decreases or falls away, the piston (13) moves in the opposite direction from the second closed position 20 over an open position and further to the first closed position under the influence of the at least one compressed compression spring (20, 20 ') which relaxes against the piston (13). 5. Purge valve (8) according to claim 1, characterized in that the external pressure pulse sent from the water softener (4) downstream of the filter (3) from the water softener (9) to the purge valve comes from the water softener at the moment that the water softener starts its rinsing or regeneration 30 and the filter is not operating. Purging valve (8) according to claim 5, characterized in that when the external pressure pulse from the water softener (4) is cut off the pressure stops the flushing or regeneration of the water softener 5 is discharged from the purging valve (8) and the purging valve (8) returns to the first closed position. Purging valve according to claim 1, characterized in that the external pressure pulse passes through a separate fluid line 10 (9) is sent to the purging valve (8), is controlled by a sensor which detects the pressure difference between the inlet and outlet of the filter (3) and controls an external pressure pulse in the event of a too high pressure difference when the filter (3) is clogged to the purging valve (8). / 0 Ceramic purging valve for liquid or gas filters. Ceramic purging valve (8) on a filter (3) that is filtered 5 provides fluid that is controlled by an external pressure pulse that is sent through a separate fluid line (9) to the purging valve and opens the purging valve for a limited purging time, the purging valve including a component (13a) with ceramic plate 10 (14), part of a piston (13), which can move between two extreme and closed positions, wherein no fluid is passed and one intermediate and open position in which the purging valve (8) does transmit a purging flow of fluid for a short time, which purging flow passes the filter (3) on which the purging valve (8) is mounted purges. Figure 2.