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The flexible joint, through its elaborately designed multi-layer rubber composite structure (inner rubber layer, reinforcing layer, outer rubber layer, and end reinforcement) and specific geometric shape (sphere/wave), essentially achieves the function of providing controllable flexibility by utilizing the elasticity of rubber. Its core value is reflected in five key roles: compensating for displacement, reducing vibration and noise, lowering installation difficulty and stress, preventing leakage, and extending the system's lifespan. It is an indispensable "safety valve" and "shock absorber" in modern pipeline systems.

Pipeline installation machines and tools are essential equipment used to lay, align, join, and secure pipes in industries such as water supply, oil and gas, sewage, and construction. From trenchless systems to large-scale infrastructure projects, these tools ensure safe, efficient, and accurate pipe deployment—above or below ground.

A butterfly valve is a structurally simple and compact fluid control valve. Its core components include a valve body, a rotatable disc-shaped "butterfly" plate, a stem that drives the disc, and a sealing seat. The valve operates through a 90-degree rotational motion: when opening, the disc rotates from a position perpendicular to the pipeline axis (closed state) to parallel with it (fully open), allowing unobstructed flow; when closing, the disc rotates 90 degrees back to block the flow path, with its edge pressing tightly against the seat to form a sealed ring, thereby stopping fluid flow.

Visualize a gate valve as a vertical plate sliding across a straight pipe: when raised, flow is unobstructed; when lowered, the pipe is severed. Its structure prioritizes minimal flow resistance when open and bidirectional shutoff, resulting in a straight flow path and symmetrical body. A globe valve acts like a plug at a pipe bend: inserted downward to block the turn. Its design emphasizes sealing reliability and flow control, necessitating a tortuous flow path, asymmetrical body, and mandatory flow direction. These inherent structural contrasts define their divergent functionalities and applications.