RU179272U1 - Pneumatically operated filling valve - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular to devices for filling tanks with liquid. The device comprises a housing in which a fluid cavity, an air control cavity, a seat and a valve disc, a return spring, a bellows hermetically separating the liquid and air cavities are located, characterized in that the piston rod is connected to the valve disc from the side opposite to the return spring . The technical result consists in eliminating the possibility of unauthorized opening of the valve under the influence of the pressure of the charge fluid in the absence of control air pressure, which improves the operational properties of the valve and expands its scope. 1 ill.

Description

The proposed utility model relates to mechanical engineering, in particular to devices for filling tanks with liquid.

In tank refueling systems, air-operated normally-closed refueling valves are widely used. In the closed position, such a valve is held by the force of the return spring. The valve opens under the control pressure of the air supplied to the control cavity of the valve from a special source of compressed air. The valve closes when the control pressure is released from the control cavity under the action of the force of the return spring.

The peculiarity of such valves is that the conditions of their use, operation and design are significantly affected by the direction of movement of the plate when the valve is closed relative to the direction of flow of the fluid being charged through the valve. Depending on the direction of movement of the plate when closing in relation to the direction of movement of the fluid flow, direct and reverse action valves are distinguished (see A.I. Edelman. Fuel valves of the liquid propellant rocket engine. M .: Mashinostroenie, 1970. - 244 p.). If the directions of movement of the plate and the liquid are opposite, then the valve is called a “direct acting valve” or “closing against the flow”, if the directions of the movement of the plate when closing the valve and the liquid flow coincide, then the valve is called a “reverse valve” or “closing by the flow”. In a pneumatically controlled normally-closed filling valve, the liquid flow during refueling moves against the movement of the plate to close, and, therefore, such a valve refers to direct acting valves or closing against the flow.

Known pneumatically controlled filling valve containing a housing in which a liquid cavity, an air control cavity, a valve seat and a valve seat, a return spring, a bellows, hermetically separating the liquid and air cavities are placed (the prototype of the proposed utility model shown in Fig. 1.3, page 9 of the book A.I. Edelman, Fuel Valves of LRE (Moscow: Mashinostroenie, 1970).

A disadvantage of the known valve is that when filling the liquid, the valve can open unauthorized, without supplying control pressure, under the action of the pressure of the liquid being refilled itself, as the direction of movement of the fluid flow and the direction of movement of the plate to close are opposite, therefore, the unbalanced pressure force of the liquid acts on the plate in the direction of valve opening and, overcoming the compression force of the return spring, raises the plate from the saddle. This feature of the valve degrades its performance and limits the scope.

The objective of the proposed utility model is to eliminate this drawback of the prototype.

This problem is solved by the fact that the piston rod is docked to the valve plate, on the side opposite to the return spring, and the effective piston area from the seat side is comparable with the passage area of the valve seat, and the ratio of the piston area S _p from the seat side to the area S _c saddles S _p / S _c = 0.8 ... 1.0, where S _p = π / 4 (d _p ² - d _pc ² ), S _c = π / 4 (d _c ² - d _pc ² ), d _p , d _with, d _pc - the diameter of the piston, seat and rod, respectively.

The technical essence of the proposed utility model is illustrated in the figure, which shows the structural diagram of the valve. The numbers in the figure indicate

1 - housing;

2 - fluid cavity;

3 - air control cavity;

4 - valve seat;

5 - valve plate;

6 - return spring;

7 - bellows;

8 - stock;

9 - the piston.

The valve operates as follows. In the initial position, the control in the absence of air pressure P and _a refuelable fluid pressure P _x to the presence of a plate 5, the valve is closed, Tarel 5 is pressed against the valve seat 4, the force of the spring 6, the liquid does not flow through the valve. When applying the control air pressure to the cavity 3, the air pressure force presses the spring 7, the plate 5 moves away from the seat 4, the valve opens, the fluid passes through the valve. In the absence of the control air pressure P and _in the presence of pressure p _w tareli liquid prior proposed valve 5 remains closed, since the fluid pressure forces acting on the plate 5 - F _t and the piston 9 - F _{p are} directed in opposite directions and are equal due to the equality of the area of the passage section of the seat 4 and the effective area of the piston 9 from the side of the seat.

The technical result of the proposed utility model is to exclude the possibility of unauthorized opening of the valve under the influence of the pressure of the charge fluid in the absence of control air pressure, which improves the operational properties of the valve and expands its scope.

Thus, a pneumatically controlled filling valve is proposed, comprising a housing in which a liquid cavity, a control air cavity, a valve seat and a disc, a return spring, a bellows hermetically separating the liquid and air cavities are located, are docked to the valve disc from the side opposite to the return spring. piston rod. The ratio of the area S _{p of the} piston from the side of the saddle to the area S _{c of the} saddle S _p / S _c = 0.8 ... 1.0, where S _p = π / 4 (d _p ² - d _pcs ² ), S _c = π / 4 (d _s ² - d _pcs ² ), d _p , d _s , d _pcs - diameter of the piston, seat and rod, respectively.

Claims (2)

1. A pneumatically controlled filling valve, comprising a housing in which a fluid cavity, an air control cavity, a valve seat and a disc are located, a return spring, a bellows, hermetically separating the fluid and air cavities, characterized in that to the valve disc, from the side opposite to the return spring docked rod with piston. 2. A pneumatically operated filling valve according to claim 1, characterized in that the ratio of the area S _{p of the} piston from the seat to the area S _{c of the} seat S _p / S _c = 0.8 ... 1.0, where S _p = π / 4 (d _n ² -d _pcs ² ), S _c = π / 4 (d _c ² -d _pcs ² ), d _p , d _c , d _pcs - diameter of the piston, seat and rod, respectively.

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