JPH0729680B2 - Valve device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a valve device interposed between a liquid storage tank and a plurality of oil supply devices.

(Prior Art) For example, in a gas station or the like, a plurality of tanks containing fuel oil are connected to respective separate oil supply devices. In this way, however, each tank and each oil supply device are made independent. In this case, the amount of oil consumed for each tank may vary due to the amount of sales that varies depending on the location of the fueling device. For such a problem, as shown in FIG. 8, the tanks A, B, C, and D are connected by a joint J, and pipes are connected to the oil supply devices E, F, G, and H from here. Although such a system is adopted, this system can equalize the amount of oil consumption in each tank A, B, C, D to improve the oil storage efficiency, but on the other hand Since replenishment is done for each tank, oil flows into another tank through joint J due to the siphon action.
There arises a problem that the capacity of the other tanks is changed and the refueling work becomes difficult.

To solve this problem, joint J
A check valve may be provided between the tank and each of the tanks A, B, C, and D to prevent oil from flowing into other tanks. However, in the case of such a configuration, the valve device is connected to the weighing machine. When the oil in the pipe line rises due to the outside air temperature and the liquid pressure rises, another problem arises that the liquid pressure causes damage to the valve device or the pipe line.

(Problems to be Solved by the Invention) The present invention has been made in view of such problems, and an object of the present invention is to enable supply of liquid to individual weighing machines and to provide a pipeline. An object of the present invention is to provide a new valve device capable of suppressing an increase in hydraulic pressure inside the valve.

(Means for Solving the Problem) That is, the present invention provides, as a valve device for solving the problem, a valve device including an inlet port communicating with each oil storage tank and an outlet port communicating with each weighing machine. And a plurality of valve device main bodies in which the outlets are communicated with each other via a valve case, and an upward valve seat formed between these inlets and outlets is provided upright on the inlet side. A valve seat slidably attached to the guide rod,
A valve seat, which is fixed to the top of the valve receiving body and is urged by a spring interposed between a plate-shaped stopper member that abuts the main body when the valve opens to limit the rise of the valve, and the valve seat. A check valve having a relief valve-like function, which is constituted by a valve body that abuts on the check valve, is provided.

(Operation) With this configuration, the temperature of the liquid in the conduit extending from the valve device main body to the positive displacement pump increases due to the effect of external heat, and the liquid pressure increases accordingly. A check valve having a relief valve-like function that is displaced by the hydraulic pressure on the outlet side allows the hydraulic pressure in this conduit to escape to the inlet side to prevent damage to the check valve or the outlet-side conduit.

(Examples) Therefore, the details of the present invention will be described below based on illustrated examples.

FIGS. 1 and 2 show a valve device which constitutes an embodiment of the present invention, and FIG. 3 shows a piping system equipped with this valve device.

In the two valve device bodies indicated by reference numerals 10 and 20 in the figure,
Inlet ports 11a, 21a connected to the respective storage tanks T ₁ , T ₂
And the positive displacement pumps installed on the respective weighing machines S ₁ and S _2.
Flow paths 11 and 21 having outlets 11b and 21b connected to P ₁ and P ₂ are provided. Upward valve seats 12 and 22 are provided in the respective flow paths 11 and 21, and these valve seats 12 and 22 are also provided.
Openings 13 and 23 are provided in the upper part opposite to 12 and 22, and both valve device main bodies 10 and 20 are provided with a valve case 30 described later provided so as to cover these openings 13 and 23. They are integrally fixed so as to communicate with each other.

Numerals 14 and 24 are check valves arranged so as to come into contact with the above-mentioned valve seats 12 and 22, respectively, and when negative pressure from the positive displacement pumps P ₁ and P ₂ acts, or the storage tanks T ₁ and T _When the pressure of the liquid flowing in from ₂ acts, the liquid is displaced upward and the flow paths 11 and 21 are opened. This check valve 14 (24)
Is a valve receiving body 14a (24a) slidably attached to a guide rod 15 (25) provided upright on the main body 10 (20), and this valve receiving body
14a (24a) is a plate-shaped stopper member 14b (2
4b) and the valve seat 14a (24a) interposed between the spring 14c
(24c) and the valve body 14d (24d) which is placed in pressure contact on the valve receiving body 14a (24a).
14d (24d) is integrated with the valve seat 14a (24a) to form the valve seat 12
(22) is in contact with the top and blocks the flow path 11 (21), but negative pressure is applied from the positive displacement pump P ₁ (P ₂ ), or the liquid storage tank T ₁ (T ₂ ). If a hydraulic pressure is applied from the valve receiving body 14a (24a) and the valve body 14d (24d), both act as a check valve that displaces upward to release the flow passage 11 (21). If the pressure of the liquid in the pipe D ₁ (D ₂ ) leading to the pump P ₁ (P ₂ ) side rises, the valve receiver 14a (24a) that receives this liquid pressure will It acts as a relief valve that descends against the spring 14c (24c) and releases hydraulic pressure to the tank T ₁ (T ₂ ) side from the gap formed with the valve body 14d (24d). Is configured.

On the other hand, 30 is a valve case fixed on both valve device main bodies 10 and 20 so as to cover the two openings 13 and 23 described above, and this valve case 30 is, as described above, both valve device main bodies 10 and 20.
At the same time as connecting and integrating 20, it plays a role of connecting the flow paths 11 and 21 of both valve device bodies 10 and 20 through the recesses 31 provided inside. In this valve case 30, a female screw 32 is provided immediately above one opening 13, and a screw rod 16 having a handle 15 for turning by hand is screwed onto the upper end of the female screw 32. The sluice valve 17 rotatably attached to the lower end is configured to seal one opening 13.

In FIG. 3, symbols M ₁ and M ₂ are flowmeters, and N ₁ and N ₂ are liquid supply nozzles.

Next, the operation of the above-mentioned device will be described.

In normal use, the sluice valve 17
Has been pulled up, and both valve device bodies 10 and 20 have openings 13 and 23.
It is in communication with each other.

In this state, when one or both of the positive displacement pumps P ₁ (P ₂ ) of the weighing machines S ₁ and S ₂ are operated to perform liquid supply,
Negative pressure from P ₁ (P ₂ ) acts on both valve device bodies 10 and 20 to displace check valves 14 and 24 upward, and from liquid storage tanks T ₁ and T ₂ to pump P ₁ (P ₂ ). Open the liquid path to reach tanks T ₁ , T ₂
Is supplied to the pump P ₁ (P ₂ ) for liquid supply.

Therefore, if the resistances of the pipelines from the tanks T ₁ , T ₂ to the weighing machines S ₁ , S ₂ are the same and the burial depths of the tanks T ₁ , T ₂ are the same, both tanks T ₁ , T 2 Liquid ₂ is sucked up equally.

When pump P ₁ (P ₂ ) stops after the required amount of liquid has been supplied,
The flow of the liquid from the storage tanks T ₁ and T ₂ is stopped, and accordingly, the check valves 14 and 24 descend due to their own weight to close the flow paths 11 and 21.

By the way, during the period when the liquid supply is stopped, the liquid in the pipe lines D ₁ and D ₂ from the valve device bodies 10 and 20 to the respective weighing machines S ₁ and S ₂ is heated by the outside air, and the liquid pressure increases accordingly. Then, this hydraulic pressure is
Acts on the check valve 14 (24) and springs the valve supports 14a, 24a.
It is lowered against 14c, 24c, and the valve receiving bodies 14a, 24a and the valve body 14
d, to escape into the conduit C _1, C ₂ communicating the fluid pressure generated in the conduit D _1, D in ₂ in the liquid storage tank T _1, T ₂ side from a gap made between the 24d, the check valve Prevents damage to 14 and 24 and pipelines D ₁ and D ₂ in advance.

When the liquid is replenished to _one of the liquid storage tanks T ₁ by the lorry, the liquid level in the liquid storage tank T ₁ receiving the liquid replenishment rises, and due to the differential pressure generated therewith, tank
The check valve 14 on the valve device body 10 side that communicates with T ₁ is pushed up, and the liquid flowing out from this tries to flow into the other tank T ₂ via the recess 31 of the valve case 30, but the liquid at this time Since the pressure acts on the check valve 24 of the other valve device main body 20 from above, the check valve 24 keeps the flow passage 21 closed and prevents the liquid in the other tank T ₂ from being siphoned. Block the inflow.

In addition, tank T ₁ , which is in communication due to change of oil type,
When it becomes necessary to separate T _{2 from} each other, the handwheel 15 is operated to close the opening 13 by the sluice valve 17 attached to the lower end of the screw rod 16. Thereby, the individual valve device main body 10,
Since 20 is in a state of being independent of each other, the liquid in one liquid storage tank T ₁ is independently fed to one weighing machine S ₁ and the liquid in the other liquid storage tank T ₂ is independently fed to the other weighing machine S ₂ . Will be supplied.

4 to 6 show a second embodiment of the present invention.

In the valve device main body shown by reference numeral 40 in this figure, like the valve device main body described above, an inlet port communicating with the liquid storage tank T is provided.
41 a, an outlet 41 b communicating with the positive displacement pump P ₁ provided in the _first weighing machine S ₁ , and a passage 41 having an upper opening 43 are provided, and an upward valve provided in the passage 41. In the seat 42,
A valve receiving body 44a slidably attached to a guide rod 45 provided upright on the main body 40, a plate-like stopper member 44b fixed to the top of the valve receiving body 44a, and a pressure contact with the valve receiving body 44a by a spring 44c. A check valve 44 having a function as a relief valve, which is composed of the mounted valve element 44d, is provided.

This valve device body 40 is a valve case fixed on the top
It communicates with the joint body 50 described later via 60,
The opening 43 provided in the upper portion is configured to be closed by a manually operated sluice valve 47 provided in the valve case 60.

On the other hand, the joint main body 50 integrally connected to the valve device main body 40 via the valve case 60 is provided with an upward opening 53 communicating with the recess 61 of the valve case 60, and the joint main body 50 is provided on three sides with three openings. The second, third, and fourth weighing machines S ₂ ,
Outlets 51a, 51b, 51c communicating with the positive displacement pumps P ₂ , P ₂ , P ₄ provided in S ₃ , S ₃ are provided.

In this embodiment, as long as the valve device body 40 and the joint body 50 are in communication with each other, the check valve 44 is opened and liquid is supplied from the liquid storage tank T regardless of which of the pumps P _{2 to} P ₄ is operated,
Further, even if the liquid temperature in any of the pipelines D _{2 to} D ₄ leading to each of the weighing machines S _{2 to} S ₄ rises and the liquid pressure becomes high in the state where the liquid supply is stopped, the valve receiver 44a is caused by the liquid pressure. Moves down to release the hydraulic pressure generated in the pipelines D _{2 to} D ₄ to the pipeline C communicating with the liquid storage tank T side, and acts to prevent the pipelines D _{2 to} D ₄ from being damaged. Also,
The manually operated sluice valve 47 allows the upper opening 43 of the valve device body 40.
If the first weighing machine S ₁ is kept operative, the other weighing machines S _{2 to} S ₄ can be repaired and inspected.

(Effects) As described above, according to the present invention, the inflow ports communicating with the respective oil storage tanks and the outflow ports communicating with the respective weighing machines are provided, and the outflow personnel are communicated with each other through the valve case. The valve seats slidably attached to the guide rods are attached to the upward valve seats of the plurality of valve device bodies, and the valve seats are fixed to the top of the valve seats and come into contact with the body when the valve opens to raise the valve. Each check valve having a relief valve function, which is constituted by a plate-shaped stopper member for limiting and a valve body that is urged by a spring interposed between the valve receiver and abuts against the valve seat, is provided. As a result, the check valve is opened by the negative pressure on the outlet side caused by operating any pump, and the storage tank and the liquid supply pump are automatically connected,
One or a plurality of liquid storage tanks and liquid supply pumps can be scrambled to communicate with each other at any time, and a single stopper member allows appropriate movement with respect to the hydraulic pressure on the outlet side and valve receiving by a guide rod. While holding the body stably, it is possible to ensure proper movement of the valve during liquid supply.

In addition, the liquid in the conduit from the valve device body to the positive displacement pump is heated by the influence of external heat, and even if the liquid pressure increases accordingly, it is displaced by the liquid pressure on the outlet side. The check valve having a relief valve function allows the hydraulic pressure in the pipeline to be safely released to the inlet side, and damage to the check valve or the outlet side pipeline can be prevented in advance.

[Brief description of drawings]

1 and 2 are a side view and a front view of an apparatus showing an embodiment of the present invention, and FIG. 3 is a view showing a piping system equipped with the same apparatus.
4 and 5 are a side view and an external view of an apparatus showing another embodiment of the present invention, FIG. 6 is a view showing its piping system, and FIG. 7 is a view showing a piping system of a conventional apparatus. . 10, 20, 40 ... Valve device main body 12, 22, 42 ... Valve seat 13, 23, 43 ... Opening 14, 24, 44 ... Check valve 14a, 24a, 44a ... Valve receiving body 14b, 24b, 44b ... Stopper member 14c , 24c, 44c ... Spring 14d, 24d, 44d ... Valve body 30, 50 ... Valve case 17, 37 ... Gate valve T, T ₁ , T ₂ ... Liquid storage tank P _1- P ₄ ... Positive displacement pump S _1- S ₄ … Weighing machine

Claims (1)

[Claims] 1. A plurality of valve devices, each of which has an inflow port communicating with each oil storage tank and an outflow port communicating with each weighing machine, and wherein the outflow ports communicate with each other via a valve case. A valve receiving body configured as a main body and slidably attached to a guide rod standing upright on the inlet side on an upward valve seat formed between the inlet and the outlet, and the valve receiving body. The valve seat is fixed to the top of the valve seat and urged by a spring interposed between the plate-shaped stopper member that abuts the main body when the valve is opened to limit the rise of the valve, and the valve seat. A valve device comprising a check valve having a relief valve-like function configured by a valve element that abuts against a valve.