DE2734626A1 - ACTUATOR DEVICE FOR A HIGH PRESSURE VALVE - Google Patents

Description

DIPL.-PHYS. F. FINALLY ο * cs4 untef> pfaf'enhofen July 29, 1977 PATENT ADVOCATE. E / egg Munich. «Sea.

Ψ. FINALLY, POST BOX D - BO34 UN TE R PFA FF ENHO FtN it / OHO /. D.

TELEX: B2173O

My file: F-4298 Applicant; Flow Industries, Inc. » Kent, Wash. 98O31, USA

Actuating device for a high pressure valve

The invention relates to an actuator device for a high pressure valve, in particular for a shut-off valve for a water jet spray nozzle unit.

Reliable shut-off valves are especially useful for water jet spray nozzle units of importance where a water pressure of about 2100 to 4200 kp / cm and a jet speed of the order of 90 tn / sec can be achieved to Preliminary work or similar processing operations to be carried out with the aid of the water jet. Reliable closing of the shut-off valve is also important for safety reasons, so that the water jet neither endangers nor endangers operators Damage to objects can be caused on which the water jet hits.

Because of the very high water pressure, there is also a powerful, massive and relatively heavy actuator device required in order to be able to open the valve quickly against the effect of the overpressure. The danger that accidental opening of the shut-off valve is caused, especially in the case of spray nozzle devices designed as hand-held devices.

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units lead to difficulties. Even if, for example An actuator device with an oil pressure of about 105 to 210 kp / cm is used, is the required device very large and heavy compared to the size and weight of the small shut-off valve. If such a unit falls on the floor when the shut-off valve is closed, this can cause forces which, upon impact, lead to Lift the valve off its seat. Because of the high overpressure, a particular difficulty is also to be seen in that a suitable seal is provided for the actuating rod of the actuator device with respect to the valve chamber must be, whereby different and relatively large frictional forces can be caused. If so a force is exerted directly on the valve body by the actuating rod in order to reliably push it against the valve seat to press, the highest possible frictional resistance must be able to be overcome by this force. If on the other hand the occurring frictional resistance is low, can be achieved by a Excessive closing force can damage the sealing valve seat surfaces.

It is therefore the object of the invention to provide an actuator device for a high-pressure valve under as far as possible Avoidance of the disadvantages and difficulties mentioned in this way to improve that the valve can be opened and closed quickly and reliably without risk of damage, and in particular in the closed state is secured against unwanted opening due to impacts or vibrations.

According to the invention, this object is achieved by the subject matter of claim 1 solved. Advantageous further developments of the invention are the subject of the subclaims.

The essential features are therefore to be summarized of the invention to see that a connection with a dead game between a displaceable in its longitudinal direction Valve body and the actuator device is provided, in which connection a spring is provided that the valve body biases in the closing direction when the operating rod

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of the actuator by an associated return spring in Closing direction is shifted. Therefore, the valve can be opened quickly and in the closed position against unintentional opening secured. When the hydraulic pressure in the actuating cylinder is reduced, the preloaded spring causes the Closing force exerted by the water pressure is increased to ensure that the valve closes automatically. The dead game in the Connection therefore enables the preload of the spring when the valve is closed to protect against unintentional damage Open when shock or vibration occurs.

The invention is to be explained in more detail using a preferred exemplary embodiment shown in the drawing. Show it:

1 shows a longitudinal section through a water jet spray nozzle unit with an actuator device according to the invention in the closed state of the high pressure valve;

FIG. 2 is an enlarged partial view of the high pressure valve in FIG. 1; and

3 and 4, sectional views corresponding to FIG. 1 and FIG. 2, respectively when the high pressure valve is open.

The spray nozzle unit shown enables the generation of a jet of water at a speed of the order of magnitude 90 m / sec at a water pressure between about 2100 and 4200 kp / cm, so that with the help of the water jet Schneidoder Drilling operations can be carried out. The water supplied by a pressure booster, not shown, is the Inlet 10 of a valve housing 12 is supplied via a connection 14. The water can pass to an outlet nozzle 16 a valve body 18 pass through a chamber 20, which serves to guide the valve body in a longitudinally displaceable manner. On the valve body, a valve cone 22 is arranged, which together with a valve seat 24 forms a passage gap to a Channel 26 limited in a valve seat block 28. On the valve 'housing 12, a connecting sleeve 30 is screwed, which the Block 28 centered in the valve housing and seals and with

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which the outlet nozzle 16 is screwed. A beveled shoulder 28a on the inner end of the block 28 abuts an annular one Edge 12a on the valve housing 12.

The valve body is preferably frustoconical Provided valve cone and the seat surface of the valve seat 24 is complementary thereto. How best to look 2 and 4, the cone angle of the valve seat 24 is slightly larger than that of the valve cone 22, see above that ensures a well-sealing seat with a new valve is. After wear and tear, the annular contact surface is gradually widened so that a good seal still remains is guaranteed, which is important at such a high pressure, in particular for safety reasons.

The valve housing consists of an upper housing part 12V and a lower housing part 12P. The two housing parts are held together in a stable manner in the region of their interface 38 by four bolts 40. Between the two housing parts is a sealing O-ring 42 pressed in.

A cylinder 44 is located in the lower housing part 12P limited by a wall 44a, in which a piston 46 and a return spring 48 are arranged in the form of a Telierfederpakets are. The return spring 48, which can also have another known shape, is located at the lower closed end of the cylinder chamber 44 against an end plate 50, and presses with its upper end against the piston 46, to this in the closing direction of the Preload valve cone 22. Opposite the upper end face of the piston 46, hydraulic pressure medium is not via a illustrated control device of the cylinder chamber 44 via a Connection 52 is supplied, which communicates with a radial channel 54 and an axial channel 56 in the housing block of the actuator stands. Through this axial channel 56 an actuating rod 58 extends into a central bore in the Piston 46 is screwed in and protrudes downward into a central cylindrical projection 46a. This lead sticks out the spring 48 in the form of a Te rf ede rpake te down so far

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suggest that its lower end can strike against an adjusting screw 60 serving as a stop, which is screwed into a bore in the end plate 50 and ¹ SaS lower end of the cylinder 44 protrudes. Pressurized water exiting through a sealing unit 71 for the actuating rod 58 can be diverted through a bracket 80.

The upper end of the actuator rod 58 slidably extends through an opening in a bracket 62 on the valve body 18 before which delimits a chamber 62a in which the end of the actuating rod 58 is screwed to a head 64, which is displaceable in the chamber 62a. Loosening of the connection is prevented by a wedge 64a. Between the head 64 and a base part 68 for the valve body 22, a coil spring 66 is arranged. The base part 68 is with a screwed into the carrier 62 at a precise distance and anchored to it by a transverse pin 70.

When hydraulic pressure medium is supplied, the piston 46 is pressed down against the action of the spring 48, so that the valve cone 22 reaches the open position shown in FIG. By the stop on the adjusting screw 60 the stroke distance is limited. Before the stop occurs, the head 64 engaging the end wall of the carrier 62 acts an inevitable opening of the valve. The closed position of the valve is on the other hand ensured by the fact that it is reached when the hydraulic pressure is reduced. When the hydraulic Pressure above the piston 46 is reduced, the piston 46 is moved into its upper end position in the cylinder by the return spring 48 44 shifted so that the head 64 is pushed up along a corresponding lifting distance. By moving of the head 64, the valve body 18 moves into the closed position, in which the valve cone 22 rests on the valve seat 24. Although the force exerted on the carrier 62 by the water pressure dec the valve cone 22 is already pressed against its seat without additional measures, the closed position is thereby still not adequately secured. However, the spring 66 serves to

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to push the valve cone against the seat when the operating rod 58 is pushed up by its return spring. Then the spring 66 is under compressive stress because the valve cone 22 rests against the valve seat before the return stroke of the actuating rod 58 is ended.

With such a construction in which the pressure relief valve normally closed and proportionate small and light back and forth sliding shut-off valve can be used, and in the case of a connection with a dead one Play with the relatively heavy hydraulic actuator device is provided, there is therefore a risk of undesired opening of the high-pressure valve due to impacts etc. can be largely reduced.

Another essential advantage of the invention is also to be seen in the fact that there are difficulties with known Actuator devices are avoided in connection with different frictional resistances between the Actuating rod 58 and the sealing unit 71 can occur. When the frictional forces between the seal unit 71 and the operating rod 58 are large, a relatively large hydraulic force is required to operate the operating rod 58 move. If, on the other hand, the frictional forces between the sealing unit and the operating rod are only small, only a small hydraulic force is required to move the operating rod.

In known high-pressure valves, the actuating rod is rigidly connected to the valve cone 22. If so then a high hydraulic Pressure is exerted to move the operating rod and the frictional forces between the sealing unit and the actuating rod are low, the valve cone 22 is pressed against the valve seat with a relatively large force, so that the valve is mechanically overstressed, which leads to an early failure of the high-pressure valve can ren. On the other hand, if only a small amount of hydraulic pressure is applied to move the operating rod 58 and the Rei forces between the sealing unit and the actuation

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A ° 273A626

rod are large, the actuating rod can not be moved, so that the valve is then unusable.

These difficulties are avoided by the invention in that the high pressure valve is opened in each case by hydraulic actuation pressure and by the return spring the valve is closed, the forces occurring are in each case sufficiently high, the frictional forces between the actuating rod and the sealing unit, but preventing mechanical overload occurs when the valve cone 22 closes. This is due to the sliding arrangement of the bracket 62 on the operating rod achieved and by allowing an initial pressure force via the small spring 66, so (iß the valve cone 22 relieved of the closing force of the return spring 48 when the valve is closed. As soon as the valve cone rests on the seat, the water pressure holds in the valve chamber by the force exerted on the carrier and on the valve body the valve in the closed position, until the high pressure valve opens, the actuating rod again through the piston 46 is pushed back.

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Claims (8)

DIPL-PHYS. F. FINALLY ν ■ eoj4 unterpfaffenhofen July 29, 1977 PATENT ADVERTISER E / Ei PHONE _Dunu . MUNICH 84 30 SS P. (NOUICH, POST BOX O - 94 UNDER PFAFFEN HO FEN TELEGRAM ADDRESS: CA.LE ADDRESS. PATENDLY MONKS TELEX: B2173O My File * F-4298 Flow Industries, Inc. Claims ι 1.) Actuator device for a high pressure valve, in particular for a shut-off valve for a water jet spray nozzle unit, characterized in that that a connection with dead play is provided between the actuating rod (58) and the valve body (18), and that a spring (66) is provided in the connection so that a biasing force is applied in the closing direction of the valve is exercised when the actuating rod is displaced by its return spring (48) in the direction of the valve will. 2. Actuator device for a high pressure valve according to claim 1, characterized in that that a hydraulic actuating piston (46) is arranged in a cylinder (44), that a hollow cylindrical carrier (62) is arranged on the valve body (18) that the actuating rod (58) is slidably displaceable in the Interior of the carrier (62) extends and carries a head serving as a stop, which is located in the interior of the carrier (62) is longitudinally displaceable, and that the spring (66) is arranged between the head (64) and a base part (68) of the valve body is. 3. Actuator device for a high pressure valve according to claim 2, characterized ze ichnet that a frustoconical valve cone (22) is formed on the valve body, and that the cone angle of the complete 709806/0821 ORIGINAL INSPECTED mentally designed valve seat (24) larger than that of the valve cone. 4. Actuator device for a high pressure valve according to one of the preceding claims, characterized g e identifier Ichnet that the mass of the drive device (46, 58) is a multiple of the mass of the valve body (18) is. 5. Actuator device for a high pressure valve according to claim 4, characterized in that that the inlet (10) in the valve housing (12) in the guide chamber (20) adjacent to the end opposite the Valve seat (24) opens. 6. Actuator device for a high pressure valve according to One of the preceding claims, characterized in that the carrier (62) is designed in this way is that through the inlet (10) entering liquid under high pressure on an additional closing pressure exerts the valve body (18). 7. Actuator device for a high pressure valve according to claim 1, characterized by a valve housing with an inlet and a flow channel, through an outlet with a valve seat, with which a valve chamber is connected, through a valve member, to a valve element and to a valve element carrier, which is located in the valve chamber is guided to bring the valve element into and out of engagement with the valve seat by a valve actuating device, which can be pushed back and forth in the valve housing by means of a connecting device a dead play, which connects the actuating device to the valve carrier, with a device for limiting the closing movement of the actuating device, and by a spring between the actuator 709886/0821 and the carrier for transmitting a closing force for the Valve onto the valve carrier when the valve actuator is in its restricted position to thereby to close the valve. 8. Actuator device for a high pressure valve according to claim 1, marked ine t by a valve housing with a passage channel and an inlet, through an outlet which is limited by a valve seat a valve chamber in communication therewith, through a valve member with a valve element and a valve element carrier, which is movably guided in the valve chamber to move the valve element into and out of engagement with the valve seat to bring, through a valve actuator an actuating member which can be displaced back and forth in the valve housing outside the chamber by means of a coupling device with a dead game, which connects the actuating device to the valve carrier, by a with rod connected to the actuator and slidably protruding into the valve body through a rubbing seal assembly in the housing, through an operative intermediate the rod and the carrier arranged spring member for transmitting closing force to the valve carrier in one Direction of movement of the actuator, by one the movement of the actuator in the one direction inevitably limiting device in order to bring the valve into the seat position indirectly through the force of this spring, and by cooperating stop means on the rod and the bracket which are brought into engagement can to cause an inevitable return stroke of the carrier and the valve after an initial movement along a dead distance of the rod during the reverse movement of the actuator. 709686/0821