JPH0150669B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention selectively performs an operation in which the vapor recovery valve of a tank truck is simultaneously opened and closed in conjunction with the opening and closing of the bottom valve, and an operation in which the vapor recovery valve can be opened and closed independently when the bottom valve is closed. The present invention relates to a valve operating device that allows the valve to be opened.

Depending on the type of liquid being handled, the tank truck is equipped with a pump driven by on-board power to supply and discharge liquid into the tank. Toxic substances can be safely drained by gravity, so a bottom valve is installed at the bottom of the tank, which is operated from the top of the tank. In this type of tank truck, if the bottom valve is closed and oil is loaded from a different filler port than the base tank, it is dangerous to release the air containing flammable vapor inside the tank truck into the atmosphere. Because it accompanies
The vapor valve installed at the top of the tank of the tank truck is opened to allow air containing flammable vapor to return to the base tank via the connecting pipe, preventing danger and facilitating loading. When the tank lorry travels and reaches the point of use and discharges into the underground tank of the refueling office, the bottom valve is opened and at the same time the vapor valve is opened so that the flammable vapor in the underground tank is received into the tank of the tank lorry. be able to do so.

Japanese Utility Model Publication No. 53-45849 discloses an example of a valve operating device for a tank lorry for the above purpose. This device is an air recovery valve (vapor valve) at the top of the tank.
The center valve shaft and the bottom valve are connected by a splined connecting rod, and when the operating lever is rotated at the upper end of the center valve shaft, the bottom valve also rotates and opens upward due to threaded engagement, and the center valve shaft also opens accordingly. The valve is pushed up and the vapor valve also opens, but when the control lever is raised and the center valve shaft is pulled up using a lever, it slides on the connecting spline and the bottom valve remains closed, allowing the vapor valve to open independently. It is starting to open.

One is that this device allows you to perform two types of operations by using the operating lever, so for example, when you raise the operating lever to open only the vapor valve, the operating lever may be rotated by mistake and loosened in the direction of opening the bottom valve, causing liquid leakage. There is a risk that this will occur, and lateral thrust will be applied to the pin connection between the central valve shaft and the operating lever, causing uneven wear.

The present invention has been made to solve the above-mentioned problems of the prior art, and by performing two types of operations using separate handles and turning levers, mutual interference is prevented, and moreover, the The structure is such that uneven loads are not applied when operating the handle or lever.

That is, the valve operation device for a tank lorry of the present invention as a solution has an overall structure including a forebank, in which a vapor valve provided at the upper part of the tank of the tank lorry and a bottom valve provided at the lower part of the tank are connected by a joint and a continuous eave. In the valve operation device connected via the valve box, the vapor valve is held in the valve box of the vapor valve together with an integral hollow stem part so as to be able to move up and down and not rotate, and is biased downward toward closing by a back pressure spring, and the valve box is A turning boss with a turning lever attached to the outer periphery of the hollow stem portion protruding upward is fitted and combined, and the pin attached to the hollow stem portion engages with the slope formed on the turning boss, and the hollow stem portion A handle is attached to the outer upper end of the valve body of the central valve shaft, which penetrates the hollow part and is held so that it can be rotated and raised and lowered, and its lower end is connected to the bottom valve via a joint and a connecting rod, so that the handle can be opened and closed at the same time by simultaneous rotation. It is characterized in that the stopper on the central valve shaft is provided so as to face the lower surface of the vapor valve.

Hereinafter, the present invention will be explained specifically and in detail with reference to embodiments shown in the accompanying drawings.

There is a vapor valve 1 on the top of the tank of the tank truck.
A valve box 2 is airtightly attached to a tank wall 3 with a gasket 4 and bolts 5. Attach the gasket retainer 6 to the opening in the tank of the valve box 2 with the bolt 7.
The valve seat 8 of the vapor valve 1 is installed. The vapor valve 1 has a hollow stem portion 9 extending upwardly connected to the valve box 2.
The upper part is kept sealed with an O-ring 10 and passed through. This vapor valve hollow stem portion 9 can slide up and down within the valve body 2, but as shown in FIG. 4, which is a sectional view taken along the line A'-A in FIG. It is non-rotatably supported on the valve body 2 in which the valve body 11 is formed. The vapor valve 1 is pressed toward the valve seat 8 by a spring 12 stretched between it and the upper part of the valve box 2 to maintain airtightness.

The center hole of the vapor valve hollow stem portion 9 is inserted into the valve shaft 13.
penetrates vertically while maintaining sealing with an O-ring 14, and is supported so as to be vertically movable. On the other hand, in this example, a bottom valve 5 is provided at the bottom of the tank of the tank lorry, and the bottom valve 5 is raised and lowered to open and close by the relative rotation of a threaded portion. The central valve shaft 13 extends downward via a joint 16 and a connecting rod 17, and its lower end is connected to the bottom valve 15.
connected to. In this example, for the rotation of the bottom valve 15, the valve stem 13 is fitted into the vapor valve hollow stem portion 9 within the valve housing 2 so as to be capable of other rotations such as vertical movement.

The valve shaft 13 moves vertically in conjunction with the bottom valve 15 via the joint 16 and the connecting rod 17. At the height of the valve stem 13 when the bottom valve 15 is closed, there is an adjustable stopper 18 on the valve stem 13 that separates the vapor valve 1 from a small distance.
will be established. Thus, as the operating parts for both valves, first, the handle 19 is fixed to the upper end of the valve shaft 13 that protrudes above the valve box 2. On the other hand, a turning boss 21 having a slope 20 formed on the upper edge surface of the shape as shown in FIG. is fixed with a bolt 23 to prevent it from coming off, and a pin 24 that fits into the bottom of this slope 20
As shown in FIG. 6, the vapor valve hollow stem portion 9
Attach and engage. The turning boss 21 has a turning lever 25. 26 is a notch ball pressed down by a spring 27.

In the above embodiments, the bottom valve 15 has been shown as a rotary type, but it may also be of a direct pull type such as a lever or lever type. Further, the handle 19 can also be of a lever type.
In the present invention having the above configuration, the bottom valve 15
When the handle 19 is rotated to release the
The valve shaft 13 rises as it rotates, and the stopper 18 pushes up the vapor valve 1 to open it. When the bottom valve 15 is closed, the vapor valve 1 is pushed down by the valve seat 8 and returns to the closed state. Further, when the bottom valve 15 is closed, if the lever 25 is rotated, the boss 21 forming the slope 20 will rotate, pushing up the pin 24 attached to the vapor valve hollow stem portion 9, and the vapor valve 1 will be in the open state. lever 25
When it is returned to its original position, it is closed by the spring 12.

According to the present invention, there is no risk of forgetting to operate the vapor recovery valve during loading and discharging that involve opening and closing of the bottom valve due to the interlocking operation with the bottom valve, and when the bottom valve is closed as when loading from the tank inlet, there is no risk of forgetting to operate the vapor recovery valve. The vapor recovery valve can also be opened and closed independently. Furthermore, since the bottom valve operating handle and the vapor recovery lever are separate, there is less risk of erroneous operation and the operation is easy. Furthermore, since the vapor recovery lever is connected only to the vapor valve, less operating force is required. In the conventionally known method of operating the bottom valve and vapor valve with a single lever, the operating force is heavy, and the amount of operation is likely to be too large or too small. Furthermore, since the bottom valve is a lever type, it is difficult to rotate the bottom valve, and furthermore, if the lever is stopped before the dead center, the spring force causes the bottom valve to return to the starting point. On the other hand, the present invention does not have such operational difficulties, and has various advantages such as reliable operation and reliable open holding.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between the vapor valve and the bottom valve in the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the vapor valve portion, Fig. 3 is a plan view with the handle removed, Fig. 4 FIG. 5 is a perspective view of the rotation boss, and FIG. 6 is an inspection view of the upper part of the vapor valve hollow stem. 1... Vapor valve, 2... Valve box, 3... Tank wall, 4... Gasket, 5, 7, 23... Bolt, 6... Gasket retainer, 8... Valve seat, 9
... Paper valve hollow stem part, 10, 14 ... O-ring, 11 ... Plane part, 12, 27 ... Spring, 13
...Valve stem, 15...Bottom valve, 16...Joint, 17...
...Running rod, 18...Stopper, 19...Handle,
20... slope, 21... rotation boss, 22... cover, 24... pin, 25... lever, 26... ball for notch, 27... spring.

Claims (1)

[Claims] 1. In a valve operating device that connects a vapor valve installed at the top of the tank of a tank lorry and a bottom valve installed at the bottom of the tank via a joint and a continuous eaves, the vapor valve is integrated into the valve box of the vapor valve with a hollow stem. The stem is movable up and down along with the valve body and is held non-rotating, and is biased downward in the valve closing direction by a back pressure spring, and is connected by fitting a turning boss with a turning lever onto the outer periphery of the hollow stem that protrudes above the valve box. The pin attached to the hollow stem part engages with the slope formed on the turning boss, and at the same time, the pin attached to the hollow stem part passes through the hollow part of the hollow stem part and is attached to the outer upper end of the valve body of the central valve shaft, which is held so that it can be turned and raised and lowered. A handle is attached, and its lower end is connected to the bottom valve via a joint and a continuous eaves so that they can be opened and closed simultaneously by simultaneous rotation, and a stopper on the center valve shaft is provided opposite to the bottom surface of the vapor valve. Valve operating device for tank lorries.