FR2502281A1 - Tank base safety valve - has tapering plug with protruding top cone and mating tapering seat - Google Patents

Abstract

The safety valve for mounting in the base of a tank is designed to break any crust formed by rust or other deposits. It comprises a tapering male plug (1) fitting in a tapering female seat (2), while the plug top face is of protruding cone shape. The automatic closing drive has a valve stem (3), guide (4), spring (5) and end washer (6), mounted below the plug, so that is is only in contact with the contents of the tank when these are being drained off.

Description

DESCRIPTION
Tank bottom crust breaker for transport and storage of all products.

 The present invention relates to equipment for tanks, cisterns and containers of all products allowing their emptying at the appropriate time.

These pieces of equipment play a safety role during the movement or handling of containers which mitigates the unexpected risks of accidents or broken pipes.

 The systems currently used include a part of their mechanism in permanent immersion in the products contained considerably accelerating the damage from corrosion. On the other hand, their tightness is ensured by a single seal which in the event of alteration calls into question the very function of the system.

The valve, according to the invention, overcomes these drawbacks first by the design and position of its mechanisms subject to contact with the products only during the transfer phase since located opposite the latter relative to the body of valve, then by the shape and equipment of the valve head giving it the following advantages
a) Frustoconical bearing substantially increasing the contact surface of the seats and thereby ensures a satisfactory seal even without a joint.

Furthermore, this shape makes it self-centering and given the fact that the valve head, at full opening, does not escape from its seat, any unexpected rupture of the control members would cause the instantaneous closure of the valve, closure favored by the suction phenomenon due to product flow.

 b) Equipment of the range by two O-rings so that if by chance the first seal deteriorates it will be replaced in its function by the second.

 c) Cap of the conical valve head assigning to it its particularity as a crust breaker.

 Thus described, the valve head (1) fitted with these seals (21) comes to bear on its seat (2), directed by an axis (3) in a guide (4) and returned to the closing by a spring (5 ) resting on a washer (6) forming a shoulder of the axis (3).

 The seat (2) is provided in standard flanges (7) 1 'or to be welded (8).

 This valve head common to all models can be actuated by means of three different mechanisms.

 The attached drawing No. 1/3 is a sectional view of the valve associated with the upper control.

 The attached drawing 2/3 is a sectional view of the valve associated with the lateral control.

 The attached drawing 3/3 is a sectional view of the valve associated with the lower control.

 According to a first variant, the opening of the valve (1) is ensured by a top control consisting of a tie rod (9), hooked at one of its ends in a ring secured to the valve head, and the other in a pull-up bar (10). This drawbar moved by an actuator (11) is guided in a body (12) and stopped in rotation by a lug (13).

 The body (12) is assembled on a standardized flange (14) allowing the attachment of the entire mechanism to the tank body.

 According to a second variant, the opening of the valve (1) is ensured by a lateral control acting in thrust under the axis (3).

 This action comes from a lever (15) articulated on an axis (16) driven by a cam (17) secured to a shaft (18) itself controlled, for a quarter turn, by a crank. Incase of sectioning the piping, favored by a breaking groove (23), the lever (15) would no longer maintain its action under the axis (3) and would release it when it closes automatically.

 The design of this control variant has been carried out so as to be able to associate it with a higher control according to the first variant.

 According to a third variant, the opening of the valve (1) is ensured by a lower control acting in pushing under the axis (3).

 This action comes from a push bar (19). This wall push bar by an actuator (11) is guided in a body (12) and stopped in rotation by a lug (13). The body (12) is assembled on a base (20) integral with the flow pipe.

 In the event of sectioning of the piping, favored by a rupture groove (23), the push bar (19) would no longer maintain its action under the axis (3) and would release the latter when it is automatically closed.

 The design of this control variant was carried out in such a way as to be able to associate it with a higher control according to the first variant.

 The technical requirements for the transport and storage of liquid, pasty and powdery products, requiring safety valves complying with the standards and regulations tending to come into force, led to the development of the product which is the subject of the present invention, which, from this fact, will immediately find its outlet with the manufacturers and users of tanks, reservoirs, tanks and transport or storage containers, which represent a buoyant market for which the offer is in default.

Claims (5)

 10 / Crankcase breaker safety valve adapted to a standard or welded fixing system, characterized by the shape of its valve head (1) with male frustoconical bearing fitting onto its female frustoconical seat (2), and its protruding conical cap.  20 / Safety valve according to claims1 characterized in that the automatic return system on closing the valve composed of an axis (3), a guide (4), a spring (5) and a washer (6) is installed under the valve head (1) and is therefore only in contact with the product during the opening operations.  30 / Safety valve according to claims 1 and 2 associated with a lateral control characterized in that the mechanism is housed in an external appendage (22) to the flow piping and composed of a lever (15) with large actuated travel by a cam (17) integral with a shaft (18) maneuvering a quarter of a turn.  40 / Safety valve according to claims 1 and 2 associated with a lower control characterized in that the control parts are fully protected from the flow of products and that the body (12) has an external shape suitable for supporting a heating collar.  50 / Safety valve according to claim 3 characterized in that the lever (15) for opening control acts without connection but by simple contact on the axis (3).  60 / Safety valve according to claim 4 characterized in that the push bar acts without connection but by simple contact on the axis (3).