Earth bar laying device

Abstract

The present invention discloses a grounding rod installation device that allows for easier work without being constrained by surrounding conditions or working conditions when burying a grounding rod in the ground, enables the grounding rod to be buried in the ground using only a pushing force utilizing hydraulics rather than impact, thereby eliminating surface damage to the grounding rod during construction, and enables the installation work to be performed by universally applying it to various types of grounding rods. The aforementioned grounding rod installation device comprises a hydraulic generating unit fixed in a vertical direction and generating operating pressure by operation, a pressurizing unit that buries a grounding rod underground via the operating pressure generated from the hydraulic generating unit, and an operating pressure intermittent transmission unit that intermittently provides the operating pressure generated from the hydraulic generating unit to the pressurizing unit in accordance with the stroke of the pressurizing unit.

Description

Technology Field

[0001] The present invention relates to a construction device capable of burying a grounding rod in the ground, and more specifically, to a detachable grounding rod construction device capable of conveniently burying a grounding rod in the ground without damage, regardless of surrounding conditions or working conditions. Background Technology

[0002] Generally, grounding work for utility poles, steel towers, steel poles, or steel pipe poles is carried out by burying grounding rods underground. In this case, the underground burial work for the grounding rods and the quantity of grounding rods to be buried must be performed in accordance with the work procedures and construction standards listed in the Distribution Construction Manual.

[0003] For example, according to the work procedures in the power distribution construction manual, the grounding electrode installation method, excavation direction, excavation width, and excavation depth are determined by considering the grounding resistance standard, soil type, and site conditions, and typically, a pit for burying the grounding electrode must be excavated to a depth of at least 0.75m below the surface. In addition, although there are no separate standards for the installation method of grounding rods, metal grounding rods with sufficient strength are generally installed using the impact method, while other special grounding rods are installed using separate methods suited to their characteristics.

[0004] In addition, according to the grounding construction standards in the power distribution construction manual, the grounding electrode of a grounding wire installed in close proximity to a reinforced concrete pole must be installed so as not to come into contact with the support structure, and must be spaced as far apart as possible, and metal supports such as steel towers, steel poles, and steel pipe poles must be spaced at least 1.0m away.

[0005] In addition, since a depth of approximately 2 meters or more must be secured from the ground surface for burying grounding rods, performing the work manually is not only difficult but also takes an excessive amount of time. Accordingly, a crane mounted on a vehicle is used to operate a screw to drill a hole for burying grounding rods, or a guide cell capable of fixing the screw to a separate support is used to perform the drilling work.

[0006] Meanwhile, grounding resistance decreases logarithmically depending on the number of grounding rods. Once the grounding resistance decreases to a certain level, it reaches a critical value where it no longer decreases, and the grounding resistance will no longer decrease regardless of how many grounding rods are buried.

[0007] The critical value of such grounding resistance is related to the soil resistivity and the grounding construction area; however, in densely populated areas such as the metropolitan area, it is difficult to obtain road excavation permits, making it impossible to secure the necessary grounding construction area and thus limiting the number of grounding rods that can be buried.

[0008] Furthermore, grounding resistance is closely related to the length of the grounding rod. As the length of the grounding rod increases, the grounding resistance decreases. Accordingly, standards currently recommend series installation using the deep driving method to reduce grounding resistance.

[0009] However, during deep driving construction, the copper sheathing of the grounding rod is pushed and wrinkled by the impact. Furthermore, if the lead terminals are struck excessively with a hammer, the connection points of the grounding lead wires may become detached or damaged, and the surface of the grounding electrode may be damaged. This results in a measured grounding resistance value higher than the actual value, requiring the installation of additional grounding rods. Consequently, not only are unnecessary construction costs incurred, but there is also a risk of injury to workers when striking the grounding rod, and noise becomes a subject of complaints.

[0010] In addition, while drilling using a crane equipped with a screw in the cargo bed of a vehicle offers convenience, it has the problem of not being usable in environments where the vehicle cannot access. Furthermore, when drilling by fixing a guide cell to a support such as a utility pole, the screw cannot be moved left, right, forward, or backward, so there are many difficulties in burying grounding rods at a distance of up to 2.0m from the support (in the case of parallel construction on steel pipe poles, etc.). Prior art literature

[0011] Registered Patent No. 10-0958536 The problem to be solved

[0012] The technical problem that the present invention aims to solve is to provide a grounding rod installation device that enables simpler work when burying a grounding rod underground, without being constrained by surrounding conditions or working conditions.

[0013] Another technical problem that the present invention aims to solve is to provide a grounding rod installation device that allows the grounding rod to be installed underground using only a pushing force utilizing hydraulics rather than impact, thereby eliminating surface damage to the grounding rod during construction and enabling installation work to be performed by universally applying it to various types of grounding rods. means of solving the problem

[0014] The present invention, for solving the technical problem described above, preferably comprises a hydraulic generating unit fixed in a vertical direction and generating operating pressure by operation, a pressurizing unit that buries a grounding rod underground via the operating pressure generated from the hydraulic generating unit, and an operating pressure intermittent transmission unit that intermittently provides the operating pressure generated from the hydraulic generating unit to the pressurizing unit in accordance with the stroke of the pressurizing unit.

[0015] In an embodiment of the present invention, the hydraulic generating unit preferably comprises a hand pump that generates operating pressure from manual operation by an operator, and an actuator that transmits the operating pressure generated from the hand pump to the pressurizing unit.

[0016] In an embodiment of the present invention, it is preferable that the hand pump is pivotably installed for manual operation by an operator and has an operating lever that provides operating force to the hydraulic generating unit.

[0017] In an embodiment of the present invention, the hydraulic generating unit preferably has a connecting connector for receiving an operating pressure separately provided from the outside and transmitting it to the actuator.

[0018] In an embodiment of the present invention, the hydraulic generating unit is preferably installed to be detachably mounted on a ground structure via a detachable mounting unit, and the detachable mounting unit comprises a support fixed in a vertical direction via a fastening band and a connecting shaft connecting the support and the hydraulic generating unit in a horizontal direction.

[0019] In an embodiment of the present invention, it is preferable that the connecting shaft be pivotably coupled to the support member via a hinge portion.

[0020] In an embodiment of the present invention, the connecting shaft is preferably composed of a member capable of length adjustment, such as a telescopic structure.

[0021] In an embodiment of the present invention, the pressure member is provided with an adapter for fixing one end of the grounding rod, and the adapter is preferably equipped with an adjustment screw that is fastened to fix the grounding rod.

[0022] An embodiment of the present invention preferably further includes a hollow expandable member installed in the hydraulic generating part to guide the movement of the pressurizing part, and further includes a hollow protective tube installed in the expandable member to accommodate and protect the grounding rod inside.

[0023] In an embodiment of the present invention, the operating pressure intermittent transmission unit preferably comprises a pressure chamber that generates operating pressure when the hand pump is operated, a cylinder of the actuator installed to communicate with the pressure chamber, a piston rod movably installed inside the cylinder and connected to the pressurizing unit, a return spring installed inside the cylinder to pressurize the piston rod in a release direction, and an opening / closing control valve that operates to allow or cut off communication between the pressure chamber and the cylinder according to the stroke of the piston rod.

[0024] In an embodiment of the present invention, it is preferable that a supply pipe and a return pipe are independently installed between the pressure chamber and the cylinder, respectively, and configured to be connected so as to enable mutual communication.

[0025] An embodiment of the present invention further comprises a check valve and a check valve installed respectively in the supply pipe and the return pipe to allow only unidirectional flow, and preferably, the opening and closing control valve is installed in the return pipe to control the opening and closing of the flow path.

[0026] An embodiment of the present invention further includes a lower limit switch and an upper limit switch installed in the cylinder to detect the lower and upper limit positions of the piston rod, respectively, and preferably, the opening / closing control valve is configured to open when the lower limit switch is turned on and close when the upper limit switch is turned on. Effects of the invention

[0027] The grounding rod installation device according to an embodiment of the present invention allows for drilling work to be performed manually by being carried and moved more easily even in areas where cargo vehicles capable of operating screws using a crane cannot enter, due to surrounding conditions or working conditions when burying grounding rods underground. This enables a significant reduction in the cost and time required for burying grounding rods.

[0028] In addition, since the grounding rod installation device according to the embodiment of the present invention can bury the grounding rod underground using only a pushing force utilizing hydraulics rather than striking, damage to the coating of the grounding rod caused by striking during deep driving construction, or detachment or damage to the connection part of the grounding lead wire, can be fundamentally eliminated. Furthermore, since it can be universally applied to various types of grounding rods to perform underground burial work, versatility in equipment utilization can be achieved.

[0029] In addition, the grounding rod installation device according to the embodiment of the present invention can bury the grounding rod deeper by utilizing a separate extension connector even when the grounding rod is buried in the ground, thereby improving the completeness of the installation work. Brief explanation of the drawing

[0030] FIG. 1 is a schematic diagram illustrating the usage state of a grounding rod installation device according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing only the configuration of the detachable installation part of a grounding rod construction device according to an embodiment of the present invention in an enlarged manner. FIG. 3 is a configuration diagram showing an enlarged view of the rear configuration of the detachable installation part of a grounding rod construction device according to an embodiment of the present invention. FIG. 4 is a configuration diagram showing an enlarged view of the joint portion between the pressurizing part and the grounding rod in a grounding rod construction device according to an embodiment of the present invention. FIG. 5 is a configuration diagram illustrating the detailed configuration of the operating pressure intermittent transmission unit in a grounding rod construction device according to an embodiment of the present invention. Specific details for implementing the invention

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached illustrative drawings. In this process, the thickness of lines or the size of components depicted in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. In addition, the following embodiments are not intended to limit the scope of the present invention but are merely exemplary details of the components presented in the claims of the present invention; any embodiments that include components that are included in the technical concept throughout the specification of the present invention and are substitutable as equivalents for the components of the claims may be included within the scope of the present invention.

[0032] Referring to FIG. 1, a grounding rod installation device according to an embodiment of the present invention comprises a ground structure (10) such as a utility pole, a detachable installation part (20) that is detachably installed on the ground structure (10), a hydraulic power generating part (30) that is installed on the ground structure (10) via the detachable installation part (20), and a pressurizing part (40) that operates by the operating pressure generated from the hydraulic power generating part (30) to bury a grounding rod (1) underground.

[0033] The above ground structure (10) is a structure fixed in an upright position relative to the ground, and refers to a fixed structure installed generally in a vertical direction, such as a utility pole. In addition, the above ground structure (10) is a fixed structure located close to a place where grounding facilities are required to be installed, and can be replaced with various types of structures such as steel towers, steel poles, or steel pipe poles, so it is not necessarily limited to a utility pole.

[0034] Referring to FIGS. 1, 2, and 3, the detachable mounting member (20) is a member for detachably installing the hydraulic generating member (30) on the ground structure (10), and comprises a support member (21) installed in a state of contact in a generally vertical direction on one side of the ground structure (10), a fastening band (22) inserted through a through hole (21a) located at both ends of the support member (21) and wrapping around the entire perimeter of the ground structure (10), and a connecting shaft (23) installed to connect the support member (21) and the hydraulic generating member (30) in a generally horizontal direction.

[0035] The above support member (21) is a member fixed in a vertical direction to the above ground structure (10) via the fastening band (22), and it is preferable that it be formed in a generally flat plate shape to wrap around the perimeter of the above ground structure (10) over a certain section. In particular, the left and right ends of the support member (21) are configured to have a plurality of through holes (21a) spaced apart at appropriate intervals for fixing the fastening band (22).

[0036] The above-mentioned fastening band (22) is a member installed to wrap around the entire perimeter of the above-mentioned ground structure (10), and is preferably made of a flexible material. It is configured to have a fastening groove (22a) and a fastening buckle (22b) for fixing to the above-mentioned ground structure (10). In this case, the fastening groove (22a) is a plurality of components provided at close intervals on the fastening band (22) and performs the function of fixing the fastening band (22) to the above-mentioned ground structure (10) in a rigid state through coupling with the fastening buckle (22b).

[0037] The above connecting shaft (23) is a member connecting the support (21) and the hydraulic generating unit (30), and it would be more preferable for it to be composed of a member that can adjust the length in multiple stages, such as a telescopic structure.

[0038] Additionally, the detachable mounting part (20) is configured to further include a hinge part (24) that pivotally connects the connecting shaft (23) to the support (21). That is, the hinge part (24) performs the function of pivotally connecting the connecting shaft (23) to the support (21).

[0039] As a result, the hydraulic generating unit (30) is installed so that its position can be adjusted horizontally over a longer range relative to the ground structure (10) via the connecting shaft (23), and is also installed so that it can rotate horizontally around the ground structure (10) in a range of approximately 0 to 180 degrees via the hinge unit (24).

[0040] The above hydraulic generating unit (30) is an element corresponding to a type of hydraulic supply source that generates operating pressure by operation by a worker, and in this case, the operating pressure generated represents the size required to bury the grounding rod (1) underground. That is, the above hydraulic generating unit (30) is installed so as to be detachably attached to the above ground structure (10) via the above detachable installation unit (20), and preferably installed so as to be fixed in the vertical direction.

[0041] To this end, the hydraulic generating unit (30) is equipped with a hand pump (31) that generates operating pressure from manual operation by a worker, as shown in FIG. 1, and an actuator (32) that transmits the operating pressure generated from the hand pump (31) to the pressurizing unit (40).

[0042] In this case, the hand pump (31) is pivotably installed for manual operation by an operator and is equipped with an operating lever (31a) that provides operating force to the hydraulic generating unit (30). That is, the operating lever (31a) is operated by manual operation by an operator to enable the hydraulic generating unit (30) to generate a predetermined operating pressure.

[0043] In addition, the hydraulic generating unit (30) is configured to have a separate connection connector (33) for receiving an operating pressure provided separately from the outside and transmitting it to the actuator (32).

[0044] In this case, the connecting connector (33) corresponds to a medium that directly transmits a separate operating pressure provided from the outside to the hydraulic generating unit (30), separate from the generation of operating pressure by the operation of the hand pump (31). For example, the connecting connector (33) corresponds to a type of input port connected to a separate hydraulic facility that generates a predetermined operating pressure by power generated from a Power Take Off (PTO) device equipped in a commercial vehicle. In addition, the connecting connector (33) is configured to be directly connected to the pressure chamber (31b) described later.

[0045] In addition, the present invention further comprises a hollow, expandable structure (34) installed in the hydraulic generating unit (30) to guide the movement of the pressurizing unit (40). That is, the expandable structure (34) is composed of a member whose size can be adjusted in multiple stages along the longitudinal direction, such as a telescopic structure, and performs the role of stably supporting and guiding the downward displacement of the pressurizing unit (40) relative to the hydraulic generating unit (30).

[0046] In addition, the present invention further comprises a hollow protective tube (35) installed in the above-mentioned flexible structure (34) to accommodate and protect the grounding rod (1) inside. In this case, the protective tube (35) is also configured in the form of a telescopic structure that can be adjusted in size in the longitudinal direction, just like the above-mentioned flexible structure (34), and performs the role of stably supporting and guiding the downward displacement of the grounding rod (1).

[0047] Referring to FIGS. 1 and 4, the pressurizing unit (40) operates to be displaced downward by the operating pressure generated from the hydraulic generating unit (30) and performs the role of burying the grounding rod (1) underground. That is, the pressurizing unit (40) is configured to transmit a downward pushing force to the grounding rod (1) by being displaced downward through the operating pressure generated from the hydraulic generating unit (30).

[0048] To this end, the pressure member (40) is provided with an adapter (41) for fixing one end of the grounding rod (1), and the adapter (41) is equipped with an adjustment screw (42) that is fastened to fix the grounding rod (1). That is, the adjustment screw (42) serves to enable the mounting of grounding rods (1) of various specifications on the adapter (41).

[0049] The grounding rod installation device according to an embodiment of the present invention further comprises an operating pressure intermittent transmission unit that intermittently provides the operating pressure generated from the hydraulic power generation unit (30) to the pressurizing unit (40) in accordance with the stroke of the pressurizing unit (40).

[0050] Referring to FIG. 1 and FIG. 5, the operating pressure intermittent transmission unit comprises a pressure chamber (31b) that generates operating pressure when the hand pump (31) is operated, a hollow cylinder (32b) corresponding to the pressure chamber of the actuator (32) that is installed to communicate with the pressure chamber (31b), a piston rod (32a) that is installed to be movable in the vertical direction inside the cylinder (32b) and whose lower end is connected to the pressurizing unit (40), a return spring (32c) that is installed to pressurize the piston rod (32a) in the release direction inside the cylinder (32b), and an opening / closing control valve (132b) that operates to allow or cut off communication between the pressure chamber (31b) and the cylinder (32b) according to the vertical stroke of the piston rod (32a).

[0051] In this case, the pressure chamber (31b) includes a piston (not shown) that moves in conjunction with the pivoting operation of the operating lever (31a), and corresponds to a component that generates operating pressure in the manual operation hand pump (31). In particular, it is preferable that the cross-sectional area of ​​the pressure chamber (31b) be set to be smaller than the cross-sectional area of ​​the cylinder (32b). This is to allow the small operating pressure generated in the pressure chamber (31b) to be amplified into a larger operating pressure in the cylinder (32b) and transmitted to the pressurizing unit (40), thereby making it easier to perform the burial work on the grounding rod (1).

[0052] Additionally, the pressure chamber (31b) and the cylinder (32b) are configured to be mutually connected via a supply pipe (131) and a return pipe (132). That is, the supply pipe (131) and the return pipe (132) are installed independently between the pressure chamber (31b) and the cylinder (32b), respectively, so that they are mutually connected.

[0053] Additionally, a check valve (131a) and a check valve (132a) that allow only unidirectional flow are respectively installed in the supply pipe (131) and the return pipe (132). The check valve (131a) allows only unidirectional downward flow in the supply pipe (131) extending from the pressure chamber (31b) to the cylinder (32b). Additionally, the check valve (132a) allows only unidirectional upward flow in the return pipe (132) extending from the cylinder (32b) to the pressure chamber (31b).

[0054] Additionally, the cylinder (32b) is equipped with a lower limit switch (32d) for detecting the lower limit position of the piston rod (32a) and an upper limit switch (32e) for detecting the upper limit position of the piston rod (32a).

[0055] That is, the lower limit switch (32d) detects the lower limit position during the stroke of the piston rod (32a) inside the cylinder (32b), and the upper limit switch (32e) detects the upper limit position during the stroke of the piston rod (32a) inside the cylinder (32b).

[0056] Additionally, the above-mentioned opening / closing control valve (132b) is configured to switch from a closed state to an open state when the piston rod (32a) comes into contact with the lower limit switch (32d) and turns on, and to switch from an open state to a closed state when the piston rod (32a) comes into contact with the upper limit switch (32e) and turns on. That is, the above-mentioned opening / closing control valve (132b) is configured as an electronic valve capable of interlocking with the operation of the upper limit switch (32e) and the lower limit switch (32d).

[0057] Meanwhile, in the configuration of the embodiment of the present invention, the hydraulic generating unit (30) is limited to a hydraulic mechanism that uses oil as a fluid medium to generate operating pressure by the hand pump (31) and the actuator (32), but it can be applied in the same way to a pneumatic mechanism that utilizes air as a fluid medium. That is, it means that the hydraulic generating unit (30) can be replaced with a pneumatic generating unit.

[0058] Accordingly, when the grounding rod installation device according to the embodiment of the present invention performs the work of burying the grounding rod (1) underground, the hydraulic generating unit (30) is firmly fixed to the above-ground structure (10) via the detachable installation unit (20).

[0059] In this state, the head portion of the grounding rod (1) is fixed to the adapter (41) by fastening the adjustment screw (42), and then the hand pump (31) is manually operated to generate operating pressure. The operating pressure generated from the hand pump (31) is supplied to the cylinder (32b) of the actuator (32) via the pressure chamber (31b) and the supply pipe (131), and the operating pressure supplied to the cylinder (32b) is transmitted to the pressurizing unit (40) via the piston rod (32a) and is provided as a pushing force that enables the grounding rod (1) to be buried underground.

[0060] In this process, the operating pressure generated by the operation of the hand pump (31) is smoothly supplied to the cylinder (32b) of the actuator (32) by passing through the check valve (131a) located in the supply pipe (131), whereas the downward flow to the return pipe (132) is restricted by the check valve (132a), so the transmission of operating pressure is not achieved.

[0061] Subsequently, when the piston rod (32a) moves from an upper limit position to a lower limit position inside the cylinder (32b), the lower limit switch (32d) is switched to the ON state by contact with the piston rod (32a), thereby switching the opening / closing control valve (132b) from a closed state to an open state.

[0062] In this process, the piston rod (32a) moves upward due to the restoring force of the return spring (32c), so the working fluid remaining inside the cylinder (32b) returns to the pressure chamber (31b) of the hand pump (31) via the return pipe (132).

[0063] In addition, during this process, the operating pressure generated by the operation of the hand pump (31) does not affect the upward movement of the piston rod (32a) inside the cylinder (32b) at all, since both the supply pipe (131) and the return pipe (132) are open.

[0064] Additionally, during this process, when the piston rod (32a) reaches an upper limit position inside the cylinder (32b), the upper limit switch (32e) is switched to the ON state by contact with the piston rod (32a), thereby switching the opening / closing control valve (132b) from an open state to a closed state.

[0065] Subsequently, after the operator moves the piston rod (32a) upward, attaches a new extension connector (3) to the adapter (41) of the pressurizing unit (40), and then restarts the hand pump (31), the generated operating pressure is supplied to the cylinder (32b) via the pressure chamber (31b) and the supply pipe (131), and then transmitted to the grounding rod (1) buried underground via the piston rod (32a), the pressurizing unit (40), and the extension connector (3). Thus, the grounding rod (1) buried underground can be buried at a deeper depth, and by repeating this process, the burial depth of the grounding rod (1) can be freely adjusted.

[0066] Meanwhile, the present invention allows the hydraulic generating unit (30) to be freely rotated relative to the ground structure (10) using the hinge unit (24), thereby making it more convenient to bury the grounding rod (1) in a suitable location around the ground structure (10). In this case, if the connecting shaft (23), which is made of a telescopic structure, is freely extended, the burial of the grounding rod (1) can be realized over a wider range centered on the ground structure (10). Since this operation can be performed without separating the detachable installation unit (20) relative to the ground structure (10), the time required to bury the grounding rod (1) can be significantly reduced. Explanation of the symbols

[0067] 1-Grounding rod 3-Extension connector 10-Ground structure 20-Detachable installation part 21-Support 22-Fastening band 23-Connecting axis 24-Hinge part 30-Hydraulic generator 31-Hand pump 31a-Operating lever 31b-Pressure chamber 32-Actuator 32a-Piston rod 32b-Cylinder 32c-Return spring 32d-Lower limit switch 32e-Upper limit switch 33-Connecting connector 34-Stretchable structure 35-Protection tube 40-Pressure part 41-Adapter 42-Adjustment screw 131-Supply pipeline 131-a Check valve 132-Return pipe 132a-Check valve 132b-Opening / Closing Control Valve

Claims

Claim 1 A hydraulic generating unit fixed in a vertical direction and generating operating pressure by operation; a pressurizing unit that buries a grounding rod underground via the operating pressure generated from the hydraulic generating unit; an intermittent operating pressure transmission unit that intermittently provides the operating pressure generated from the hydraulic generating unit to the pressurizing unit in accordance with the stroke of the pressurizing unit; a hollow expandable structure installed in the hydraulic generating unit to guide the movement of the pressurizing unit; and a hollow protective tube installed in the expandable structure to accommodate and protect the grounding rod inside, wherein the hydraulic generating unit is detachably installed to a ground structure via a detachable mounting unit, and the detachable mounting unit comprises a support fixed in a vertical direction to the ground structure via a fastening band, and a connecting shaft connecting the support and the hydraulic generating unit in a horizontal direction, wherein the connecting shaft is pivotably coupled to the support via a hinge unit, and the hydraulic generating unit is a hand pump that generates operating pressure from manual operation by an operator. A detachable grounding rod installation device comprising an actuator that transmits operating pressure generated from the hand pump to the pressurizing part, wherein the pressurizing part is equipped with an adapter for fixing one end of the grounding rod, and the adapter is equipped with an adjustment screw for fixing the grounding rod. Claim 2 A detachable grounding rod installation device according to claim 1, characterized in that the hand pump is pivotably installed for manual operation by a worker and has an operating lever that provides operating force to the hydraulic generating part. Claim 3 A detachable grounding rod installation device according to claim 1, characterized in that the hydraulic generating unit has a connecting connector for receiving an operating pressure separately provided from the outside and transmitting it to the actuator.

Images