Adjustable pressure reducing and stabilizing valve for fire fighting

Abstract

The utility model relates to the field of fire valves, and particularly discloses a fire-fighting adjustable pressure reducing and stabilizing valve which comprises a valve body, a diaphragm and a control assembly, the diaphragm and the valve body are combined to form a control cavity used for adjusting the opening degree of a main valve, and the control assembly communicates with the control cavity and is used for adjusting the pressure in the control cavity. According to the control assembly, the pressure in the control cavity is adjusted by changing the liquid amount in the control cavity, and then the opening degree of the main valve is increased or decreased. When the water pressure of the outlet end is small, the main valve keeps the large opening degree until the water pressure of the outlet end meets the set requirement, when the water pressure of the outlet end is large, the opening degree of the main valve is reduced under the action of the control assembly, then the water pressure of the outlet end is reduced, the water pressure of the outlet end of the valve body tends to be stable along with continuous adjustment of the control assembly, and the pressure reducing and stabilizing functions are achieved.

Description

Technical Field

[0001] This application relates to the technical field of fire valves, and particularly to an adjustable pressure reducing and stabilizing valve for fire protection. Background Art

[0002] The roof-type diaphragm valve is a type of diaphragm valve that uses a diaphragm as the closing member to seal the flow channel, cut off the fluid, and separate the inner cavity of the valve body and the inner cavity of the valve cover. It has the characteristics of simple structure, good sealing performance, and small fluid resistance. The common roof-type diaphragm valve forms a control cavity with the diaphragm and the valve cover, and changes the opening of the valve body by adjusting the size of the control cavity to achieve functions such as opening and closing the flow channel and adjusting the flow rate.

[0003] In the field of fire protection, the roof-type diaphragm valve can be designed and applied as valves with various functions such as deluge valves, check valves, pressure relief valves, and pressure reducing and stabilizing valves. The pressure reducing and stabilizing valve is mainly used to reduce the water pressure delivered by the fire protection water supply pump to the end pipeline or sprinkler head, and needs to adjust the end water pressure within a large range according to the actual situation to meet different usage conditions.

[0004] Currently, the common pressure reducing and stabilizing valves on the market are single-diaphragm type, which uses a single control cavity to adjust the flow rate of the medium. Due to the relatively fixed standard of the diaphragm size design, the single-diaphragm type valve body is difficult to achieve a large range of flow control and cannot meet the usage requirements in the field of fire protection. Summary of the Utility Model

[0005] In order to improve the water pressure adjustment range of the pressure reducing and stabilizing valve, this application provides an adjustable pressure reducing and stabilizing valve for fire protection.

[0006] An adjustable pressure reducing and stabilizing valve for fire protection provided by this application adopts the following technical solutions:

[0007] An adjustable pressure reducing and stabilizing valve for fire protection includes a valve body, a diaphragm, and a control assembly. The diaphragm is installed in the valve body and there are at least two diaphragms. At least two control cavities are formed between at least two diaphragms and the valve body. The control assembly is used to adjust the pressure in the control cavity.

[0008] By adopting the above technical solution, as the water pressure at the inlet end of the valve body changes, the control assembly adjusts the pressure in the control cavity by regulating the amount of liquid in the control cavity, and then adjusts the opening degree of the main valve. The decompression function can be achieved by using the control assembly to reduce the opening degree of the main valve, meeting the usage requirements, avoiding excessive water pressure at the end nozzle, affecting the use or even causing safety problems; the control assembly automatically and repeatedly fine-tunes the opening degree of the main valve, making the water pressure at the outlet end of the valve body gradually tend to a stable value to ensure the stable water pressure at the end nozzle, avoiding the influence of water pressure fluctuation on the use and improving the stability of the equipment; by setting multiple diaphragms, the maximum flow rate in the valve body can be effectively increased, and then the flow rate of the valve body can be adjusted within a larger range to expand the adjustment range of the water pressure at the end nozzle, enabling the water pressure at the end nozzle to meet different requirements and enhancing the adaptability of the valve body to different usage scenarios; at the same time, compared with a large-size single diaphragm, the multi-diaphragm synchronous flow rate adjustment has higher precision and faster response, and can further optimize the adjustment process of the pressure at the end nozzle.

[0009] Preferably, the control assembly includes a water injection pipe, a drain pipe and a pilot valve. The water injection pipe connects the control cavity and the inlet end of the valve body. The drain pipe connects the control cavity and the outlet end of the valve body. The flow rate of the drain pipe is greater than that of the water injection pipe. The pilot valve is connected and arranged on the drain pipe. When the water pressure at the outlet end of the valve body exceeds the set pressure value, the pilot valve cuts off the drain pipe.

[0010] By adopting the above technical solution, since the flow rate of the drain pipe is greater than that of the water injection pipe, when the pressure at the outlet end is less than or at the set value, the water pressure in the control cavity will not cause the main valve to close, ensuring that the flow channel remains open during normal use and ensuring the stability of the valve body; in addition, according to the change of the water pressure at the outlet end of the valve body, the pilot valve can automatically open and close to automatically change the pressure in the control cavity, thereby automatically adjusting the opening degree of the main valve. When the water pressure at the end nozzle deviates from the set value, the user does not need to manually adjust the water pressure at the end nozzle, improving the convenience of using the valve body and also avoiding the influence of untimely manual adjustment on the use of the end nozzle or even causing safety problems, and improving the error tolerance rate during use.

[0011] Preferably, a needle valve is connected and arranged on the water injection pipe.

[0012] By adopting the above technical solution, by rotating the adjustment handle of the needle valve, the flow rate of the water injection pipe can be changed to make the flow rate of the water injection pipe less than that of the drain pipe, so as to keep the main valve open under normal conditions; at the same time, according to the usage requirements, the flow rate difference between the water injection pipe and the drain pipe can be changed more conveniently.

[0013] Preferably, a needle valve is also connected and arranged on the drain pipe.

[0014] By adopting the above technical solution, the two needle valves are jointly adjusted to achieve a more precise adjustment of the flow rate difference between the two.

[0015] Preferably, the cross-sectional area of the drain pipe is larger than that of the water injection pipe.

[0016] By adopting the above technical solution, the cross-sectional area of the drain pipe is larger than that of the water injection pipe, so that the flow rate of the drain pipe is greater than that of the water injection pipe more naturally, and the main valve remains open under normal conditions.

[0017] Preferably, at least two groups of control components are provided corresponding to the number of control cavities and are respectively communicated with each control cavity.

[0018] By adopting the above technical solution, multiple control components respectively adjust the pressure in the corresponding control cavities, and at the same time adjust the opening degree and flow rate of the main valve, so that the pressure at the end nozzle can be adjusted more quickly, and the effect of pressure reduction and stabilization can be achieved more rapidly.

[0019] Preferably, an inlet communication pipe and a drain communication pipe are communicatively provided between at least two of the control cavities. The inlet communication pipe is communicated with the water injection pipe, and the drain communication pipe is communicated with the drain pipe.

[0020] By adopting the above technical solution, the inlet communication pipe and the drain communication pipe communicate multiple control cavities, synchronize the liquid volume in multiple control cavities, so that only one set of control components is needed to synchronously adjust the pressure in multiple control cavities, which can improve the control accuracy, reduce the manufacturing cost, and streamline the overall structure.

[0021] Preferably, pressure gauges for displaying water pressure are provided at both the inlet end and the outlet end of the valve body.

[0022] By adopting the above technical solution, when adjusting the water pressure at the outlet end, by continuously observing the pressure gauge at the outlet end, the pressure value at the outlet end can be adjusted more accurately; at the same time, by observing the value of the pressure gauge, it can be judged whether the pressure at the inlet end and the outlet end is abnormal, so as to judge whether there is a fault in the pipeline.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. As the water pressure at the inlet end of the valve body changes, the control component adjusts the pressure in the control cavity by regulating the amount of liquid in the control cavity, and then adjusts the opening degree of the main valve. By using the control component to reduce the opening degree of the main valve, the pressure reduction function can be achieved, meeting the usage requirements and avoiding excessive water pressure at the end nozzle, which may affect the use or even cause safety problems. The control component automatically fine-tunes the opening degree of the main valve repeatedly, making the water pressure at the outlet end of the valve body gradually tend to a stable value, ensuring the stability of the water pressure at the end nozzle, avoiding the influence of water pressure fluctuations on the use, and improving the stability of the equipment. By setting multiple diaphragms, the maximum flow rate in the valve body can be effectively increased, and then the flow rate of the valve body can be adjusted within a larger range, so as to expand the adjustment range of the water pressure at the end nozzle, enabling the water pressure at the end nozzle to meet different requirements and enhancing the adaptability of the valve body to different usage scenarios. At the same time, compared with a large-size single diaphragm, the multi-diaphragm synchronous flow rate adjustment has higher precision and faster response, which can further optimize the adjustment process of the pressure at the end nozzle.

[0025] 2. Since the flow rate of the drain pipe is greater than that of the injection pipe, when the pressure at the outlet end is less than or equal to the set value, the water pressure in the control cavity will not close the main valve, ensuring that the flow channel remains open during normal use and guaranteeing the stability of the valve body. In addition, according to the change in the water pressure at the outlet end of the valve body, the pilot valve can automatically open and close to automatically change the pressure in the control cavity, thereby automatically adjusting the opening degree of the main valve. When the water pressure at the end nozzle deviates from the set value, the user does not need to manually adjust the water pressure at the end nozzle, improving the convenience of using the valve body and also avoiding the situation that manual adjustment is not timely, which may affect the use of the end nozzle or even cause safety problems, and increasing the error tolerance rate during use.

[0026] 3. By rotating the adjustment handle of the needle valve, the flow rate of the injection pipe can be changed to make the flow rate of the injection pipe less than that of the drain pipe, so as to keep the main valve open under normal conditions. At the same time, according to the usage requirements, the flow rate difference between the injection pipe and the drain pipe can be changed more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram of an embodiment of the present application;

[0028] Figure 2 is the overall structural schematic diagram of another perspective of an embodiment of the present application;

[0029] Figure 3 is a cross-sectional view taken along Figure 2 A-A in

[0030] Figure 4 is a structural schematic diagram for showing the ridge structure.

[0031] Figure numerals: 1. valve body; 11. valve cover; 12. shell; 13. ridge structure; 2. diaphragm; 3. control chamber; 4. control assembly; 41. pilot valve; 42. water injection pipe; 43. drain pipe; 5. water inlet connecting pipe; 6. drain connecting pipe; 7. needle valve; 8. pressure gauge; 01. inlet end; 02. outlet end. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0033] The embodiment of the present application discloses an adjustable pressure reducing and stabilizing valve for fire fighting, wherein the inlet end 01 is connected to a fire water supply pump, and the outlet end 02 is connected to a terminal nozzle, and is used to control the water pressure at the terminal nozzle so that the water pressure is stabilized near a set value, thereby ensuring the normal operation of the equipment and the stability of operation.

[0034] Reference Figures 1 to 3 An adjustable pressure reducing and stabilizing valve for fire fighting comprises a valve body 1, a diaphragm 2, a control chamber 3 for controlling the opening of a main valve, and a control assembly 4 for adjusting the pressure in the control chamber 3. The diaphragm 2 is mounted on the valve body 1, the control chamber 3 is formed by a cavity between the valve body 1 and the diaphragm 2, and the control assembly 4 is connected to the control chamber 3 and is used to inject and discharge liquid into the control chamber 3 to adjust the pressure in the control chamber 3 and the position of the diaphragm 2, thereby cooperating with the valve body 1 to control the opening of the main valve.

[0035] In specific use, when the pressure at the outlet end 02 is higher than the set value, the control component 4 increases the amount of liquid in the control chamber 3, so that the pressure in the control chamber 3 increases and props up the diaphragm 2, and reduces the main valve opening to reduce the pressure on the end nozzle side until the pressure drops to near the set value; when the pressure at the outlet end 02 is lower than the set value, the control component 4 reduces the amount of liquid in the control chamber 3, so that the pressure in the control chamber 3 decreases and the diaphragm 2 retracts, and increases the main valve opening to increase the pressure on the end nozzle side until the pressure rises to near the set value. In actual operation, as the pressure at the outlet end 02 continues to change, the control component 4 continuously dynamically adjusts the amount of liquid in the control chamber 3, so that the pressure on the end nozzle side gradually fluctuates around the set value; and finally stabilizes at the set value (under the ideal state of stable water supply), at which time the pressure in the control chamber 3 remains stable, the position of the diaphragm 2 is stable, and the main valve opening remains unchanged.

[0036] Specifically, refer to Figure 3, the valve body 1 includes a housing 12, a ridge structure 13, and a valve cover 11. The ridge structure 13 is integrally provided inside the housing 12, and the valve cover 11 is installed outside the housing 12. A space for arranging the diaphragm 2 is formed between the valve cover 11 and the ridge structure 13. The diaphragm 2 includes a sealing portion and a moving portion. The sealing portion is clamped between the valve cover 11 and the housing 12 to form a sealing structure, and the moving portion moves correspondingly between the valve cover 11 and the ridge structure 13 as the liquid volume in the control chamber 3 changes.

[0037] That is to say, the control chamber 3 is surrounded by the diaphragm 2 and the valve cover 11. Correspondingly, the main valve opening degree is determined by the interval between the diaphragm 2 and the ridge structure 13. The control assembly 4 is used to adjust the liquid volume in the control chamber 3, change the position of the diaphragm 2, so as to adjust the interval between the diaphragm 2 and the ridge structure 13, and further realize the adjustment of the main valve opening degree.

[0038] Furthermore, referring to Figure 4 , the ridge structure 13 is a cross-shaped structure and is arranged in an arc shape. The valve cover 11 is arranged in a hemispherical shape. An approximately spherical space is formed between the ridge structure 13 and the valve cover 11. The moving portion is arranged in a hemispherical shape and moves within this space. When the liquid in the control chamber 3 is exhausted, the moving portion fits against the valve cover 11, and at this time the main valve is at the maximum opening degree; when the liquid in the control chamber 3 increases, the moving portion moves towards the ridge structure 13, gradually reducing the main valve opening degree; until the moving portion tightly fits against the ridge structure 13 to form a seal and cut off the flow channel, and at this time the main valve is closed.

[0039] Preferably, the valve cover 11 is flange-connected to the housing 12. The flange connection has better sealing performance, enabling a reliable seal to be formed between the valve cover 11, the sealing portion, and the housing 12. When the pressure in the control chamber 3 increases, the risk of liquid leakage from the installation gap is effectively reduced; at the same time, the flange connection is more convenient for disassembly. When there is a problem with the diaphragm 2 or the valve cover 11 is rusted, the parts can be replaced more conveniently.

[0040] Referring to Figure 1 and Figure 2 , the control assembly 4 includes a water injection pipe 42 and a drain pipe 43. The two ends of the water injection pipe 42 are respectively connected to the control chamber 3 and the inlet end 01, and the two ends of the drain pipe 43 are respectively connected to the control chamber 3 and the outlet end 02, and the flow rate of the drain pipe 43 is greater than that of the water injection pipe 42. Since the water pressure at the inlet end 01 is greater than the water pressure at the outlet end 02, the water at the inlet end 01 is injected into the control chamber 3 through the water injection pipe 42 and then discharged to the outlet end 02 through the drain pipe 43; and because the flow rate of the water injection pipe 42 is smaller, the control chamber 3 cannot reach the water pressure to close the main valve, so as to ensure that when the water pressure at the end nozzle is less than or at the set value, the main valve flow channel is in an open state, ensuring the normal flow of liquid towards the outlet end 02 during pressurization and pressure stabilization;

[0041] Meanwhile, the control component 4 further includes a pilot valve 41 which is communicatively connected to the drain pipe 43 and is used to control the on-off of the drain pipe 43. The pilot valve 41 is communicatively connected to the outlet end 02 through the drain pipe 43 and switches between the open state and the closed state according to the water pressure at the outlet end 02. In this embodiment, the selected pilot valve 41 is open under normal conditions. When the water pressure at the outlet end 02 is higher than its set value, the pilot valve 41 automatically closes to cut off the drain pipe 43, so as to increase the pressure in the control chamber 3 and reduce the main valve opening.

[0042] During specific operation, when the water pressure at the outlet end 02 is higher than the set value of the pilot valve 41, the pilot valve 41 automatically closes, and the liquid in the control chamber 3 cannot be discharged from the control chamber 3 to the outlet end 02 through the drain pipe 43. At this time, due to the pressure difference between the control chamber 3 and the inlet end 01, the water injection pipe 42 still continuously injects liquid into the control chamber 3, the pressure in the control chamber 3 gradually increases, the main valve opening decreases, and the water pressure at the outlet end 02 is reduced until it reaches the set value of the pilot valve 41; when the water pressure at the outlet end 02 is lower than the set value of the pilot valve 41, the pilot valve 41 is in the open state, the drain pipe 43 is communicatively connected, the water pressure in the control chamber 3 gradually decreases, the opening of the valve body 1 increases, and the pressure at the outlet end 02 gradually rises to the set value of the pilot valve 41.

[0043] In practical applications, under the repeated opening and closing adjustment of the pilot valve 41, the main valve opening is correspondingly finely adjusted and finally tends to be stable; when in the stable state, the water inflow and drainage in the control chamber are the same, the main valve opening remains unchanged, and the water pressure at the end nozzle is stable at the set value of the pilot valve 41 to achieve the function of pressure reduction and pressure stabilization.

[0044] Preferably, two ridge structures 13 in the housing 12 can be provided, and two valve covers 11 and two diaphragms 2 are correspondingly provided. The two diaphragms 2 cooperate with their corresponding valve covers 11 and ridge structures 13 respectively to form two control chambers 3 to synchronously control the flow channel; the two control chambers 3 can cooperate with the ridge structure 13 to form a flow channel with a larger flow rate to adjust the flow rate of the main valve within a larger range; at the same time, compared with a single large-sized diaphragm 2, the cooperation of the two diaphragms 2 can adjust the main valve opening more precisely and sensitively.

[0045] In other embodiments, according to actual needs, three ridge structures 13 in the housing 12 can also be provided, and three valve covers 11 and three diaphragms 2 are correspondingly provided. The three diaphragms 2 cooperate with their corresponding valve covers 11 and ridge structures 13 respectively to form three control chambers 3 to synchronously control the flow channel.

[0046] Furthermore, to achieve the adjustment of the two control chambers 3, the control component 4 can be provided in two groups to separately control the pressures in the two control chambers 3. The two groups of control components 4 simultaneously adjust the pressures in the control chambers 3, which can more quickly adjust the pressure at the end nozzle and quickly achieve the effect of pressure reduction and pressure stabilization.

[0047] In this embodiment, in order to adjust the two control chambers 3, a water inlet connecting pipe 5 and a drain connecting pipe 6 are connected between the two control chambers 3. The water inlet connecting pipe 5 is connected to the water injection pipe 42, and the drain connecting pipe 6 is connected to the drain pipe 43. The liquid in the water injection pipe 42 is synchronously injected into the two control chambers 3 through the water inlet connecting pipe 5, and the liquid in the two control chambers 3 is discharged from the drain pipe 43 through the drain connecting pipe 6 together. The water inlet connecting pipe 5 and the drain connecting pipe 6 synchronize the liquid volume in the two control chambers 3. Only one set of control components 4 needs to be set to synchronously adjust the pressure in the two control chambers 3, so that the manufacturing cost is reduced and the overall structure is more concise.

[0048] Further, referring to Figure 1 , a needle valve 7 is connected to the water injection pipe 42. The needle valve 7 is used to adjust the flow rate of the water injection pipe 42. By rotating the adjusting handle of the needle valve 7 to reduce the flow rate of the water injection pipe 42 so that the flow rate of the water injection pipe 42 is less than that of the drain pipe 43, it can be ensured that the main valve remains open under normal conditions.

[0049] Preferably, referring to Figure 2 , there are two needle valves 7, which are respectively connected to the water injection pipe 42 and the drain pipe 43 to more accurately adjust the flow rate difference between the two.

[0050] In other embodiments, a drain pipe 43 with a larger cross-sectional area than that of the water injection pipe 42 can also be set to form a flow rate difference between the water inlet pipe and the drain pipe 43.

[0051] Referring to Figure 1 , in this embodiment, pressure gauges 8 are provided on the housing 12 near the inlet end 01 and the outlet end 02, and the current water pressure at the inlet end 01 and the outlet end 02 can be read. In actual application, by continuously observing the pressure gauge 8 at the outlet end 02 and adjusting the pilot valve 41 at the same time, the water pressure at the outlet end 02 can be adjusted. The setting of the pressure gauge 8 can more clearly observe the water pressure at the outlet end 02 and adjust the water pressure at the outlet end 02 at any time to quickly adapt to different working conditions; at the same time, by observing the value of the pressure gauge 8, it can be judged whether the pressure at the inlet end 01 and the outlet end 02 is abnormal, so as to judge whether there is a fault in the pipeline.

[0052] The implementation principle of the embodiment of this application is as follows:

[0053] When the pressure at the end nozzle is lower than the closing pressure of the pilot valve 41, the pilot valve 41 opens, the drain pipe 43 is connected, and the water injection volume in the control chamber 3 is less than the drainage volume. At this time, the pressure in the control chamber 3 decreases, the diaphragm 2 moves towards the valve cover 11, the opening of the main valve increases, and the pressure at the end nozzle gradually rises to near the set value;

[0054] When the pressure at the end nozzle is higher than the closing pressure of the pilot valve 41, the pilot valve 41 closes, the drain pipe 43 is blocked, and since the water pressure in the control chamber 3 is less than the water pressure at the inlet end 01, the water injection pipe 42 still injects water into the control chamber 3. At this time, the pressure in the control chamber 3 increases, the diaphragm 2 moves towards the ridge structure 13, the main valve opening decreases, and the pressure at the end nozzle gradually decreases to near the set value;

[0055] During the repeated opening and closing of the pilot valve 41, the liquid volume in the control chamber 3 gradually stabilizes, the main valve opening is correspondingly fine-tuned, and finally tends to be stable; when in a stable state, the water inflow and drainage volume in the control chamber are the same, the main valve opening remains unchanged, and the pressure at the end nozzle fluctuates near the set value, realizing the function of pressure reduction and stabilization.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An adjustable pressure reducing and stabilizing valve for fire fighting, characterized in that, It includes a valve body (1), a diaphragm (2) and a control assembly (4). The diaphragm (2) is installed on the valve body (1) and there are at least two diaphragms (2). At least two control chambers (3) are formed between the at least two diaphragms (2) and the valve body (1). The control assembly (4) is used to adjust the pressure in the control chamber (3).

2. An adjustable pressure reducing and stabilizing valve for fire fighting according to claim 1, characterized in that, The control assembly (4) includes a water injection pipe (42), a drain pipe (43) and a pilot valve (41). The water injection pipe (42) connects the control chamber (3) and the inlet end (01) of the valve body (1). The drain pipe (43) connects the control chamber (3) and the outlet end (02) of the valve body (1). The flow rate of the drain pipe (43) is greater than that of the water injection pipe (42). The pilot valve (41) is connected and arranged on the drain pipe (43). When the outlet end (02) exceeds the set pressure value, the pilot valve (41) cuts off the drain pipe (43).

3. The adjustable pressure reducing and stabilizing valve for fire protection according to claim 2, characterized in that, A needle valve (7) is connected and arranged on the water injection pipe (42).

4. The adjustable pressure reducing and stabilizing valve for fire fighting according to claim 3, characterized in that, A needle valve (7) is also connected and arranged on the drain pipe (43).

5. An adjustable pressure reducing and stabilizing valve for fire fighting according to claim 2, characterized in that, The cross-sectional area of the drain pipe (43) is greater than that of the water injection pipe (42).

6. An adjustable pressure reducing and stabilizing valve for fire protection according to claim 1, characterized in that, The control assembly (4) is provided with at least two groups corresponding to the number of control chambers (3), and is respectively connected to each control chamber (3).

7. An adjustable pressure reducing and stabilizing valve for fire fighting according to claim 1, characterized in that, An inlet communication pipe (5) and a drain communication pipe (6) are connected between at least two of the control chambers (3). The inlet communication pipe (5) is connected to the water injection pipe (42), and the drain communication pipe (6) is connected to the drain pipe (43).

8. An adjustable pressure reducing and stabilizing valve for fire fighting according to claim 1, characterized in that, Pressure gauges (8) for displaying water pressure are arranged at both the inlet end (01) and the outlet end (02) of the valve body (1).

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