JPH11108223A - Manual reset type thermo-valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely control a shut-off valve to open/close according to the temperature of a heating medium by controlling the shut-off valve to open/close by operation of a reset rod, and locking the reset rod by engaging with the cutout part of a valve opening collar displacing according to thermal expansion of temperature sensitive fluid. SOLUTION: When a heating medium in a heat exchanger is kept over an upper limit set temperature intending to open a shut-off valve, from necessity of supplying LPG liquid to a gasification pressure regulating valve and the like, a reset rod 6 is manually pushed in a valve main body 1, and the shut-off valve 2 is opened through a valve rod 5. At this time, because the heating medium is over the upper limit set value, temperature sensitive fluid 8 is thermally expanded to raise the inner pressure of a pressure sensitive chamber 12 and contract a bellows 9. Hereby a valve opening lock collar 15 is elastically engaged with the upper face cutout part 6g of the reset rod 6 through a pressure receiving element 13 and a valve opening spring 14, the reset rod 6 is fixed (locked) in the state of being pushed in, and the shut-off valve 2 is maintained in the valve opening state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporizer for liquefied petroleum gas (hereinafter referred to as "LPG") or the like, which is used when a temperature of a heat medium in a heat exchanger decreases.
The liquid supply path of G is automatically shut off, and the LP
The present invention relates to a thermo valve capable of manually restarting (resetting) the supply of G.

[0002]

2. Description of the Related Art Conventionally, the vaporizer of LPG is LP
The liquid LPG supplied from the G tank or the LPG cylinder is decompressed by the vaporization pressure regulating valve, and at the same time, is supplied to the heat exchanger as a mist and exchanges heat with the heat medium in the heat exchanger to generate a vaporized gas. The configuration is generally used. In addition, the use of hot water as a heat medium is also widely known.Currently, the development of a so-called hot water supply type vaporizer that supplies and circulates hot water from a floor heating water heater as a heat medium to a heat exchanger is also underway. Is being done.

[0003]

In the prior art, hot water of about 80 ° C. suitable for floor heating is supplied from a water heater to a hot water supply type vaporizer. Since the supply is performed only by the water heater, the temperature of the hot water in the heat exchanger may not be kept constant due to a failure of the water heater.

[0004] If the temperature of the hot water circulated through the heat exchanger falls below a predetermined level and LPG that is not sufficiently vaporized is supplied to the consumer side, the volume of LPG expands several hundred times during vaporization. Risk of explosion on the consumer side. In order to avoid such danger, it is necessary to monitor the temperature of the hot water in the heat exchanger and automatically cut off the supply of LPG to the heat exchanger when the temperature falls below a predetermined level.

[0005] Further, in order to ensure further safety, even after the supply of LPG is cut off due to a decrease in the temperature of the hot water, if the temperature does not recover to a predetermined level or more, the LPG may be turned off.
It is preferable to have a configuration in which the supply of G cannot be restarted.

A second object of the present invention is to solve the above-mentioned problems, and to realize the above-mentioned structure by downsizing.

[0007]

According to the present invention, there is provided a shut-off valve having a valve element biased in a valve closing direction, a valve rod for opening and closing the valve element so as to open and close, and a push-in valve. A reset rod in which a long hole-shaped through hole is formed in the rod body capable of pressing the valve stem by operation, and a notch is formed in one of the opening surfaces of the through hole, and a reset rod inserted through the through hole. An unlocking rod orthogonal to
A valve-opening lock collar engageable with the notch; and a temperature-sensitive fluid immersed in a heat medium and thermally expanding in response to the temperature of the heat medium, on the valve-opening lock collar side of the reset rod. A sealed temperature-sensitive box, a bellows that communicates with the temperature-sensitive box and expands / contracts in accordance with the degree of expansion of the temperature-sensitive fluid, a pressure receiving element that works with the bellows, and the unlocking rod that works with the pressure receiving piece. And an interlock that can be brought into contact with, and a valve-opening spring that biases the valve-open lock collar toward the reset rod using the pressure-receiving element as a spring receiver, while the reset rod is on the opposite side to the valve-open lock collar. A temperature setting spring for urging the unlocking rod toward the reset rod side, and when the heat medium is at or above the upper limit set temperature, the reset rod can be pushed in,
In this pushed-in state, the valve-opening lock collar is engaged with the notch portion, and when the heat medium is at or below the lower limit set temperature, the engagement of the valve-opening lock collar is released.

According to the above configuration, the opening / closing control of the shutoff valve is performed by:
This is performed by actuating the valve stem by displacing the reset rod. The displacement of the reset rod may be caused by a manual pushing operation (reset) when the heat medium is at or above the upper limit set temperature, and by the biasing force of the return spring when the heat medium is at or below the lower limit set temperature.
Then, the push-in state of the reset rod is fixed by engaging the valve opening lock collar with the notch,
When the engagement is released, the reset rod is displaced by the return spring in a direction to be separated from the valve rod.

Further, the advance / retreat of the valve opening lock collar to / from the notch is performed by expansion and contraction of the bellows due to thermal expansion of the temperature-sensitive fluid. Since the pressure on the bellows balances with the temperature setting spring via the pressure receiving element, the interlock and the unlocking rod, the contraction start temperature of the bellows, that is, the valve opening lock collar is changed by changing the spring pressure of the temperature setting spring. A temperature for engaging the notch can be set. The temperature when the bellows expands and contracts against the spring pressure of the temperature setting spring and the valve opening lock collar engages with the notch is the upper limit set temperature, and is the temperature at which the shutoff valve is opened. On the other hand, when the pressure on the bellows is reduced together with the contraction of the temperature-sensitive fluid due to the decrease in the temperature of the heat medium, the valve opening lock collar is separated from the notch by the spring pressure of the temperature setting spring transmitted through the unlocking rod or the like. Force in the direction to work. The temperature when the valve opening lock collar is completely separated from the notch is the lower limit set temperature,
This is the temperature at which the shutoff valve closes. This lower limit set temperature can also be adjusted by the depth of the notch.

[0010] The temperature-sensitive fluid in the present invention refers to a substance that expands thermally in accordance with the temperature of the heating medium. In other words, it means that the volume changes in proportion to the temperature, but the form may be either liquid or gas. In addition, the thermosensitive box is immersed in a heat medium, for example, immersed in a hot water tank in a hot water supply type vaporizer, and transmits the temperature of the heat medium to the thermosensitive fluid, and changes the volume of the thermosensitive fluid to the bellows. It acts to transmit. Therefore, in order to accurately transmit the temperature of the heat medium to the temperature-sensitive fluid, it is preferable to mold the heat medium from a material having high thermal conductivity. In addition, in order to accurately transmit the volume change of the temperature-sensitive fluid to the bellows, the temperature-sensitive box needs to have rigidity that does not deform due to the volume change of the temperature-sensitive fluid. As a material having both of these properties, there is copper.

According to a second aspect of the present invention, a temperature setting interlock that is urged toward the reset rod through a spring receiver of a temperature setting spring on the side opposite to the valve opening lock collar of the reset rod and abuts on the lock release rod. A valve closing lock collar urged to the reset rod side by a valve closing spring having the temperature setting interlocking element as a spring receiver through a step of reducing the diameter of the lock release rod, and the heat medium is set to the lower limit of the reset rod. Means for selectively forming another notch into which the valve closing lock collar can engage when the temperature is below the temperature was selectively used. According to this means, when the heat medium becomes lower than the lower limit set temperature, the valve closing lock collar is engaged with the notch by the spring pressure of the temperature setting spring and the valve closing spring.
By this engagement, the state where the reset rod is separated from the valve stem, that is, the state where the shutoff valve is closed, is maintained. on the other hand,
When the heat medium is at or above the upper limit set temperature, the valve closing lock collar is displaced in a direction separating from the reset rod in accordance with the degree of expansion of the temperature-sensitive fluid transmitted through the unlocking rod, and the gap with the notch is formed. The engaged state is released. In addition, the valve closing lock collar cannot be disengaged unless the temperature of the heat medium recovers to the upper limit set temperature or higher, so that the reset rod cannot be operated.

According to a third aspect of the present invention, in any one of the above-mentioned means, a temperature setting knob is provided as a spring receiver for the temperature setting spring so that the screwing amount can be adjusted. Can be set.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, FIG. 1 is a sectional view showing an embodiment of a manual reset type thermovalve according to the present invention, wherein 1 is a valve main body, 2 is a shutoff valve attached to the valve main body 1, 3.4. Are a liquid inlet and a liquid outlet respectively communicating with the valve chamber 2a of the shut-off valve 2. When the thermo valve is installed in a vapor riser, the liquid inlet 3 is used to allow the LPG liquid to flow from an LPG tank or an LPG cylinder directly or through an abnormal pressure prevention valve or a cylinder switching valve (neither is shown). When the LPG liquid flows out to the heat exchanger directly or via a vaporization pressure regulating valve or the like, the liquid outlet 4 responds to the temperature of the heat medium of the heat exchanger and shuts off the shutoff valve 2.
For controlling the opening and closing of.

Reference numeral 5 denotes a valve stem for pressing the valve body 2b to open the shut-off valve 2, and is advanced and retracted by a reset rod 6, which will be described later. On the other hand, the valve body 2b of the shut-off valve 2 is seated on the valve seat 2e (left direction in the drawing) by a valve closing spring 2d having a valve holder 2c fixed to the valve body 1 as a spring receiver, that is, a valve closing direction. Has been energized. In addition,
FIG. 1 shows a valve stem 5 with a valve body 2b opposed to a valve closing spring 2d.
And the shut-off valve 2 is opened.

Reference numeral 6 denotes a reset rod for operating the valve rod 5 to open and close the shut-off valve 2. The reset rod 6 moves the insertion hole 1a formed in the valve body 1 along the axis of the valve rod 5 left and right. The end of the reset rod 6 is a shaft 6b having a smaller diameter than the rod body 6a (see FIG. 2), and a return spring 6c is loosely inserted into the shaft 6b to separate the reset rod 6 from the valve stem 5. Biased in the direction. Reference numeral 6d denotes a knob for manually pushing the reset rod 6 against the return spring 6c when opening the shut-off valve 2. Further, as shown in FIG. 3 (A), a long hole-shaped through hole 6e penetrating vertically is formed in the rod body 6a of the reset rod 6.
As shown in (B), a horizontal portion 6f and a notch portion 6g are juxtaposed on the upper surface of the rod body 6a from the shaft portion 6b side to the knob 6d side in the formation range of the through hole 6e, while the rod portion is formed. On the lower surface of the main body 6a, a notch 6h is formed corresponding to the upper horizontal portion 6f, and a horizontal portion 6i is formed corresponding to the upper notch 6g.

Next, in FIG. 1, reference numeral 7 denotes a thermosensitive box immersed in a heat medium of a heat exchanger in a vaporizer,
A temperature-sensitive fluid 8 having a property of thermally expanding in response to the temperature of the heat medium is sealed therein. The bellows 9 communicates with the thermosensitive box 8 via the conduit 10, and the above-described thermosensitive fluid 8 is also sealed in the pressure-sensitive chamber 12 formed by the bellows 9 and the bellows cover 11. That is, since the temperature-sensitive fluid 8 expands or contracts in proportion to the temperature of the heat medium, and the internal pressure of the pressure-sensitive chamber 12 changes, the bellows 9 is configured to expand and contract according to this internal pressure.

Reference numeral 13 denotes a pressure receiving element which moves up and down in conjunction with expansion and contraction of the bellows 9, and its movement is transmitted to a valve opening lock collar 15 via a valve opening spring 14 having the pressure receiving element 13 as a spring receiver. You. The valve opening spring 14 urges the valve opening lock collar 15 toward the reset rod 6.
The movement of the pressure receiving element 13 is also transmitted to the lock release rod 17 through the interlocking element 16 provided integrally with the pressure receiving element 13 through the valve opening lock collar 15. Note that the lock release rod 17 is inserted through the through hole 6e of the reset rod 6, and allows the reset rod 6 to move left and right while keeping both members 6 and 17 orthogonal. Further, the valve opening lock collar 15 can be fitted to the lock release rod 17. Here, FIG. 1 shows a state in which the reset rod 6 is pushed to the left (valve open state). In this state, the valve opening spring 14 is set to the valve opening lock collar 1.
5 is elastically engaged with the upper surface cutout 6g.
Therefore, in a state where the valve opening lock collar 15 is engaged with the upper surface cutout 6g, the reset rod 6 is fixed in a pushed state, and the valve opening state is maintained.

Reference numeral 18 denotes a valve closing lock collar which can be engaged at one end with the reduced-diameter step 17a of the unlocking rod 17, and has a reset rod at the other end by a valve closing spring 20 having a temperature setting interlock 19 as a spring receiver. It is urged to the 6 side. The temperature setting interlock 19 is biased toward the reset rod 6 by a temperature setting spring 22 having a temperature setting knob 21 fixed to the valve body 1 by screwing and having a spring receiver. Furthermore, temperature setting spring 2
2 is transmitted to the unlocking rod 17 via the temperature setting interlock 19, and further the unlocking rod 1
It is configured to balance with the internal pressure of the pressure-sensitive chamber 12 via the interlocking element 16, the pressure receiving element 13, and the bellows 9. According to this configuration, the bellows 9 starts to contract only when the internal pressure of the pressure sensing chamber 12 exceeds the spring pressure of the temperature setting spring 22, and the subsequent members are displaced in conjunction with this. That is, by changing the spring pressure of the temperature setting spring 22, how many times the heating medium displaces the bellows 9 and the subsequent member is adjusted, and the valve opening lock collar 15 is engaged with the upper surface cutout 6g. At the same time, temperature setting for opening the shutoff valve 2 is performed. In other words, the spring pressure of the temperature setting spring 22 can be selected according to the temperature of the heat medium for which the shut-off valve 2 is to be opened.

In this embodiment, the temperature setting knob 21 is used.
Is fixed to the valve body 1 by screwing, by adjusting the screwing amount of the temperature setting knob 21 without replacing the temperature setting spring 22 itself, the stored energy of the temperature setting spring 22, that is, The spring pressure can be adjusted, and the temperature at which the bellows 9 starts to contract can be set. In the drawing, reference numeral 23 denotes a lock nut of the temperature setting knob 22.

Next, the operation of the thermovalve having the above configuration will be described with reference to FIG. 1 and FIGS. FIG. 1 shows a state in which the heat medium in the heat exchanger is maintained at a temperature higher than a predetermined temperature (upper limit set temperature) at which the shut-off valve 2 is to be opened. The shut-off valve 2 is opened because it needs to be supplied to the regulating valve and the like. Therefore, the reset rod 6 is manually pushed into the valve body 1 (reset operation), and the valve stem 5 is pressed to the left to open the shut-off valve 2. This state is maintained as follows.

That is, when the heat medium is at or above the upper limit set temperature, the bellows 9 contracts because the temperature-sensitive fluid 8 thermally expands and the internal pressure of the pressure-sensitive chamber 12 increases.
Is transmitted to the valve-opening spring 14. The valve-opening lock collar 15 is elastically engaged with the notch 6g of the upper surface of the reset rod 6 by the urging force of the valve-opening spring 14, and is fixed (locked) in a state where the reset rod 6 is pushed in. The second valve is kept open. At this time, after the contraction force of the bellows 9 is absorbed by the temperature setting spring 22 via the pressure receiving element 13, the interlocking element 16, the unlocking rod 17, and the temperature setting interlocking element 19, the valve closing spring 20 is also contracted. As a result, the valve closing lock collar 18 is opened from the reset rod 6.

On the other hand, when the temperature of the heat medium drops below the set temperature (lower limit set temperature), as shown in FIG. 4, the internal pressure of the pressure-sensitive chamber 12 is reduced by the contraction of the temperature-sensitive fluid 8. The bellows 9 expands and the pressure receiving element 13 is displaced upward, and the urging force of the temperature setting spring 22 acts on the unlocking rod 17 via the temperature setting interlocking element 19 to move the unlocking rod 17 to the bellows 9. The force to displace to the side acts. Therefore, the energy stored in the valve opening spring 14 is reduced by the displacement of the pressure receiving element 13, and the valve opening lock collar 15 is
Is released from the reset rod 6, and the engagement with the upper surface cutout 6g is released.

As a result, the reset rod 6 is displaced rightward by the return spring 6c, and the rod body 6a
The valve body 2b is seated on the valve seat 2e by the urging force of the valve closing spring 2d, and the shutoff valve 2 is closed. Further, this closed state is maintained as follows. That is, when the reset rod 6 is displaced rightward, the lower surface cutout 6h is positioned to face the valve closing lock collar 18. The valve closing lock collar 18 resiliently engages with the lower notch 6h under the biasing force of the valve closing spring 20 which has been in the contracted state, so that the reset rod is closed with the shutoff valve 2 closed. 6 is fixed (locked).

That is, in the present embodiment, when the temperature of the heat medium becomes equal to or lower than the lower limit set temperature, the engagement of the valve opening lock collar 15 with the upper notch 6g is released, and the reset rod 6 is displaced rightward. The reset valve 6 is fixed by engaging the valve closing lock collar 18 with the lower surface cutout 6h at the same time as closing the shutoff valve 2 in conjunction with the reset rod 6.
It is configured so that the push-in operation cannot be performed.

Here, the lower limit set temperature refers to the temperature of the heat medium when the shut-off valve 2 is to be closed. More specifically, the valve opening lock collar 15 is completely removed from the upper surface cutout 6g.
It refers to the temperature of the heat medium when the valve closing lock collar 18 can be engaged with the lower surface cutout 6h. On the other hand, the upper limit set temperature refers to the temperature of the heat medium when the shut-off valve 2 is to be opened. Specifically, the valve closing lock collar 18 is completely separated from the lower surface cutout 6h, and the valve opening lock collar 15 is It refers to the temperature of the heat medium when it can engage with the upper cutout 6g.

Next, when the heat medium recovers from the state of FIG. 4 to the upper limit set temperature again, as shown in FIG.
The temperature-sensitive fluid 8 thermally expands to increase the internal pressure of the pressure-sensitive chamber 12, whereby the bellows 9 contracts and the pressure-receiving element 13
Displace the unlocking rod 17 downward via the interlock 16. Further, the valve closing lock collar 18 is displaced downward in conjunction with the displacement of the lock release rod 17, thereby being detached from the lower surface cutout 6h. As a result,
The reset rod 6 can be pushed.

At this time, the internal pressure of the pressure sensing chamber 12 is applied to the valve opening lock collar 1 via the pressure receiving element 13 and the valve opening spring 14.
5, the valve-opening lock collar 15 cannot be displaced because of contact with the rod body 6a of the reset rod 6, so that the force acting on the valve-opening lock collar 15 is absorbed by the valve-opening spring 14.

When the reset rod 6 is manually pushed in from the state shown in FIG. 5 (reset operation), the rod body 6a presses the valve rod 5 as shown in FIG. Is opened, and the supply of the LPG liquid is restarted. When the reset rod 6 is pushed in, the notch 6g on the upper surface is moved to the valve opening lock collar 15.
The valve opening lock collar 15 projects and engages with the upper notch 6g by the urging force of the valve opening spring 14 which has been in the contracted state, and the reset rod 6 is pushed, that is, the shutoff valve 2 is opened. The valve state is maintained. Thereafter, by repeating the above-described operations of FIGS. 4 to 6, the shut-off valve 2 is opened and closed according to the temperature of the heat medium, and the LPG
Supply control can be performed.

In the above-described embodiment, the lower surface cutout 6h is formed in the reset rod 6 and the valve closing lock collar 18 engageable with the lower surface cutout 6h is provided. After the shut-off valve 2 is closed, the reset rod 6 cannot be operated unless the temperature of the heat medium recovers to the upper limit set temperature. This is to avoid danger caused by careless operation of the reset rod 6 when the heat medium is at or below the lower limit set temperature (valve closed state). However, since the primary purpose of the present invention is to close the shut-off valve 2 at least when the heat medium becomes lower than the lower limit set temperature, the temperature of the heat medium recovers and the reset rod 6 is operated. The timing to be achieved can be achieved by conventionally known means. That is, it is possible to operate the reset rod 6 after confirming that the temperature of the heat medium has recovered by setting a thermometer together with the means for raising the heat medium whose temperature has been lowered by the heater or the like to the upper limit set temperature. It is.

Therefore, another embodiment which is the basis of the present invention (an embodiment corresponding to the first aspect of the present invention).
From the above-described embodiment, any one of the notch 6h of the lower surface of the reset rod 6, the valve closing lock collar 18, and the valve closing spring 20, or all of them 6h, 18, 20
May be omitted. At the same time, the temperature setting interlock 19 may be omitted, and the lock release rod 17 may be directly urged by the temperature setting spring 22. With this configuration, the valve closing control of the shut-off valve 2 due to a decrease in the temperature of the heat medium can be ensured, the number of parts of the valve can be reduced, the internal structure can be simplified, and the valve can be downsized. can do.

In the above embodiment, the change in the internal pressure of the pressure sensing chamber 12 is taken in the vertical direction, and the valve opening lock collar 15, the lock release rod 17, the valve closing lock collar 18
Although the temperature sensing mechanism and the shut-off valve 2 are arranged in the vertical direction, the reset rod 6 is arranged in the horizontal direction. is there. It is also within the technical scope of the present invention to arrange the bellows 9 and the temperature setting knob 21 upside down, and to change the arrangement of the reset rod 6 and the shutoff valve 2 to left and right accordingly. is there.

[0032]

As described above, according to the first aspect of the present invention, the shutoff valve is controlled to open and close by operating the reset rod, and the operation of the reset rod is displaced in accordance with the thermal expansion of the temperature-sensitive fluid. Since this was achieved by engaging the valve opening lock collar with the notch, the opening and closing of the shutoff valve could be reliably controlled according to the temperature of the heat medium. Further, when the heat medium becomes higher than or equal to the upper limit set temperature in the valve closed state, the reset rod can be immediately pushed and operated, which is convenient. Further, in the present invention, since the reset rod and the temperature sensing mechanism such as the bellows and the valve opening lock collar for controlling the reset rod are arranged in an orthogonal state, the size of the valve can be reduced.

According to the second aspect of the present invention, the reset rod cannot be operated unless the heat medium is recovered to the temperature equal to or higher than the upper limit set temperature by the valve closing lock collar, so that careless opening of the shutoff valve can be prevented, and safety can be reduced. Could be enhanced.

Further, in the invention according to claim 3, since the temperature setting knob is a screw-in type, it is possible to arbitrarily set the opening / closing temperature of the shut-off valve without changing the temperature setting spring itself.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a thermovalve according to an embodiment of the present invention (opened state).

FIG. 2 is a perspective view of a reset rod according to the embodiment.

FIG. 3 is a plan view of the reset rod.

FIG. 4 is a cross-sectional view showing a closing operation of a thermo valve due to a decrease in temperature of a heat medium.

FIG. 5 is a sectional view showing the operation of the thermovalve due to a rise in the temperature of the heat medium from the state shown in FIG. 4;

FIG. 6 is a sectional view showing a reset operation of the thermo valve.

[Description of Signs] 1 Valve body 2 Shut-off valve 3 Liquid inlet 4 Liquid outlet 5 Valve rod 6 Reset rod 6a Rod body 6b Shaft 6c Return spring 6d Knob 6e Through hole 6f Upper horizontal part 6g Upper cutout 6h Lower cutout 6i Lower horizontal part 7 Thermosensitive box 8 Thermosensitive fluid 9 Bellows 10 Conduit 11 Bellows cover 12 Pressure sensitive chamber 13 Pressure receiver 14 Valve open spring 15 Valve open lock collar 16 Interlock 17 Lock release rod 18 Valve closed lock collar 19 Temperature setting interlock Child 20 Valve closing spring 21 Temperature setting knob 22 Temperature setting spring 23 Interlocking rod

Claims (3)

[Claims] A shut-off valve having a valve element biased in a valve closing direction, a valve rod for reciprocating the valve element so as to be openable and closable, and a rod-shaped body for pressing the valve rod by a pushing operation. A reset rod in which a notch is formed in one of the opening surfaces of the through hole, a lock release rod inserted through the through hole so as to be orthogonal to the reset rod, and the lock release A valve opening lock collar engageable with the notch is provided on the rod shaft, and the reset rod is immersed in a heating medium on the valve opening locking collar side, and thermally expanded in response to the temperature of the heating medium. A temperature-sensitive box filled with a temperature-sensitive fluid, a bellows that communicates with the temperature-sensitive box and expands and contracts according to the degree of expansion of the temperature-sensitive fluid, a pressure-receiving element that works with the bellows, and a pressure-receiving element that works with the pressure-receiving piece. Can contact the lock release rod A valve and a valve-opening spring for urging the valve-opening lock collar toward the reset rod side by using the pressure-receiving element as a spring receiver; A temperature setting spring that urges the reset rod toward the reset rod side. When the heat medium is at or above the upper limit set temperature, the reset rod can be pushed in, and in this pushed state, the valve opening lock collar is engaged with the notch. On the other hand, when the temperature of the heat medium is equal to or lower than the lower limit set temperature, the engagement of the valve-opening lock collar is released. 2. A temperature setting interlock that is urged to the reset rod side via a spring receiver of a temperature setting spring on the side opposite to the valve opening lock collar of the reset rod and abuts on the lock release rod; Through the reduced diameter step
A valve closing lock collar urged toward the reset rod side by a valve closing spring having the temperature setting interlock as a spring receiver, wherein the valve closing lock collar can be engaged when the heat medium is at or below the lower limit set temperature. The manual reset type thermo valve according to claim 1, wherein another notch is formed in the reset rod. 3. The manual reset-side thermovalve according to claim 1, further comprising a temperature setting knob as a spring receiver of the temperature setting spring, the temperature setting knob being capable of adjusting a screwing amount.