Title of Invention

VERY FAST DIRECT ACTING PNEUMATICALLY ASSISTED SOLENOID CONTROLLED VALVE"

Abstract

A very fast direct acting pneumatically assisted solenoid controlled valve comprising a valve body (3) having an inlet (1), at one end and an outlet (2) at the other end, said valve body is provided with a opening/closing port (9) for seating of a valve (5) connected to a rod (4) , the other end of said rod is connected to a piston (6) disposed movably in a chamber (7), characterized in that said chamber (7) is provided with a port (15) at the top and a compressed air supply (10), a solenoid coil (11) around a magnetic block (12) is provided at the top of said chamber (7) disposed with a corresponding port (15) communicating with said port (15) of the chamber (7), lower end of said magnetic block is provided with a cylinder (14) with a shuttle (13) disposed operatively to move up and down to close either the port (18) of the magnetic block (12) or the port (16) at the bottom opening to the atmosphere.

Full Text

This invenion relates to a very fast direct acting pneumatically assisted solenoid controlled valve for control of flow of liquid. PRIOR ART Presently there are two types of solenoid controlled vlves. a) Indirect type: Pressurized liquid or air which is the motive force to move the piston or diaphragm of the valve is controlled by a small port fitted with a valve actuated by the solenoid coil. b) Direct acting type: In this type the port is much larger and therefore the action of the valve is comparatively much faster. There are disadvantages associated with the present types of solenoid valves. The main disadvantages associated with the present Indirect type solenoid controlled valve is that because of small size of the port, the operation of the valve is comparatively slow. Another disadvantages associated with the present direct type solenoid controlled valve in that a much larger solenoid coil is required so that the valve is bulkier, more expensive and requires a higher operating current. SUMMARY OF THE INVENTION Therefore the main object of the present invention of a direct acting pneumatically assisted solenoid controlled valve is to achieve even faster valve action than is presently possible with direct acting type. Another object of the present invention of a direct acting pneumatically assisted solenoid controlled valve in which the size of the solenoid coil is considerably reduced by using a separate compressed air motive power source. Yet another object cf the present invention of a direct acting pneumatically assisted solenoid controlled valve which is compact and requires lower operating current and cheaper. According to the present invention there is provided a very fast direct acting pneumatically assisted solenoid controlled Valve comprising a valve body having an inlet at one end and an outlet at the other end, said valve body is provided with an opening/closing port for seating of a valve connected to a rod, the other end of said rod is connected to a piston disposed movably in a chamber, characterized in that said chamber is provided with a port at the top and a compressed air supply, a solenoid coil around a magnetic block is provided at the top of said chamber disposed with a corresponding port communicating with said port of the chamber, lower end of said magnetic block is provided with a cylinder with a shuttle disposed operatively to move up and down to close either the port of the magneic block or the port at the bottom opening to the atmosphere. The nature of the invention, its objective and further advantages residing in the same will be apparent from the following description made with reference to non-limiting exemplary embodiments of the invention represented in the accompanying drawings. -3- 4 BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 shows the sectional elevation of the valve of the invention in closed position; Figure 2 shows the sectional elevation of the valve of the invention in process of opening. SUMMARY OF THE PRESENT INVENTION Accordingly there is provided an improved direct-acting type pneumatically assisted solenoid controlled valve comprising a valve body having an inlet and an outlet for entry and exist of a liquid being controlled; a rod having a valve at one end and a piston being movable in a chamber disposed above the valve body; a valve port configured on said valve being openable and closable by means of a biasing member; a first inlet port for supply of compressed air via a second port and a third port respectively to a shuttle and to the chamber; a hollow cylinder interposed in a block, the block being disposed above the chamber; a solenoid coil is provided which when energised causes a reciprocating movement of the shuttle within the hollow cylinder thereby forcing the valve to open up for allowing flow of the liquid, and in that said solenoid coil when de-energised causes the compressed air to act on the piston thereby closing down the valve. 4A DETAILED DESCRIPTION OF THE PRESENT INVENTION The valve body (3) has an inlet (1) through which the liquid enters and exists from the outlet (2) at the other end. There is a valve closing port (9) disposed at the upper portion of the valve body (3). The valve (5) as shown in Figure 1 is seating on the closing port (9). The valve at the other end is connected to a rod (4) of a piston (6). The piston (6) can move in a chamber (7). Compressed air supply is provided at (10) and the flow of compressed air is indicated by an arrow marked 'A'. The compressed air flows through the magnetic block (12) and then to a cylinder (14) to the chamber (7) via a port (15). The compressed air applied against the top of the piston (6) which keeps the valve (5) closed by seating against the port (9). The closing of the valve (5) against the port (9) can further be assisted by proiding a spring (8) between the valve (5) and bottom of the chamber (7) body. A shuttle (13) is provided inside the cylinder (14) which is free to move up and down in the cylinder (14). A solenoid coil (11) is provided over the magnetic block (12) so that when switched on the solenoid coil (11) magnetises the magnetic block (12) which pulls the shuttle (13) to close the air supply and pressure on top of the piston (6) and liqui,d under pressure enters through ports (17) pushes the piston (6) up and open the valve (5). DETAILED OPERATION OF THE VALVE Valve is normally closed (Fig. 1), compressed air enters at (10) through port (18) and passes through passage in shuttle (13) and through port (15) into chamber (7) where it acts as a force on piston (6) keeping valve (5) on it's seat and closing port (9). To open valve solenoid coil is energised (Fig, 2). Coil magnetises block (12) which pulls shuttle (13) to top of cylinder (14). This uncovers port (16) allowing compressed air in chamber (7) to escape via ports (15) and (16) to atmosphere. As pressure is reduced in chamber (7) the force acting on upper side of piston (6) reduces and force acting on lower side through liquid -5- pressure flowing through ports (17) increases and forces the piston up the chamber thus lifting valve (5) off it's a seat and allowing liquid to flow through the valve (1 to 2 through 9). The invention described hereinabove is in relation to non-limiting embodiments and as defined by the accompanying claims. -6- 7 We Claim 1. An improved direct-acting type pneumatically assisted solenoid controlled valve comprising a valve body (3) having an inlet (1) and an outlet (2) for entry and exist of a liquid being controlled; a rod (4) having a valve (5) at one end and a piston (6) being movable in a chamber (7) disposed above the valve body (3); a valve port (9) configured on said valve (5) being openable and closable by means of a biasing member (8); a first inlet port (10) for supply of compressed air via a second port (18) and a third port (15) respectively to a shuttle (13) and to the chamber (7); a hollow cylinder (14) interposed in a block (12), the block (12) being disposed above the chamber (12); characterised in that a solenoid coil (11) is provided which when energised causes a reciprocating movement of the shuttle (13) within the hollow cylinder (14) thereby forcing the valve (15) to open up for allowing flow of the liquid, and in that said solenoid coil (11) when de-energised causes the compressed air to act on the piston (6) thereby closing down the valve (5). 2. The solenoid controlled valve as claimed in claim 1 wherein said hollow cylinder (14) is disposed at the bottom end of said magnetic block, said hollow cylinder being provided with a port (16) at the bottom. 3. The solenoid controlled valve as claimed in claim 3 wherein said port (16) opens into atmosphere. 8 4. The solenoid controlled valve as claimed in claims 1, 2 and 3 wherein said shuttle (13) is disposed in the bottom position to keep the port (16) closed and the ports (18,15) opens to the chamber (7), corresponding to respective de-energising and energising the solenoid coil (11). 5. The solenoid controlled valve as claimed in claim 1 wherein the solenoid control coil (11) when switched on, the magnetic block (12) pulls the shuttle (13) to top position for opening the port (16) to atmosphere thereby opening the valve (5). 6. An improved direct acting type pneumatically assisted solenoid controlled valve as herein described and illustrated with accompanying drawings. A very fast direct acting pneumatically assisted solenoid controlled valve comprising a valve body (3) having an inlet (1), at one end and an outlet (2) at the other end, said valve body is provided with a opening/closing port (9) for seating of a valve (5) connected to a rod (4) , the other end of said rod is connected to a piston (6) disposed movably in a chamber (7), characterized in that said chamber (7) is provided with a port (15) at the top and a compressed air supply (10), a solenoid coil (11) around a magnetic block (12) is provided at the top of said chamber (7) disposed with a corresponding port (15) communicating with said port (15) of the chamber (7), lower end of said magnetic block is provided with a cylinder (14) with a shuttle (13) disposed operatively to move up and down to close either the port (18) of the magnetic block (12) or the port (16) at the bottom opening to the atmosphere.

Documents:

00156-cal-2001-abstract.pdf

00156-cal-2001-claims.pdf

00156-cal-2001-correspondence.pdf

00156-cal-2001-description(complete).pdf

00156-cal-2001-drawings.pdf

00156-cal-2001-form-1.pdf

00156-cal-2001-form-18.pdf

00156-cal-2001-form-2.pdf

00156-cal-2001-form-3.pdf

00156-cal-2001-letters patent.pdf

00156-cal-2001-p.a.pdf

156-CAL-2001-(19-03-2012)-CORRESPONDENCE.pdf

156-CAL-2001-(19-03-2012)-PA.pdf

156-CAL-2001-FORM 15.pdf

156-CAL-2001-FORM 27.pdf