丁式三阀组

丁式三阀组，或称顶装式三阀组，是三阀组的一种常见结构形式。其名称源于阀门布局与汉字“丁”的相似性，或形容其阀杆和执行机构像“钉子”一样垂直安装在阀体的顶部。这是一种高度集成、结构紧凑的阀门组合，专为差压变送器、差压流量计等设备的连接与保护而设计。

丁式三阀组与工式或H式阀组不同，丁式三阀组的特点是三个阀门（两个截止阀和一个平衡阀）的阀杆均垂直向上布置，共同安装在一个扁平的、流线型的公共阀体上。这种设计使其在空间受限的安装场合中具有好的优势。

丁式三阀组主要特点与功能：

顶装式结构： 所有阀门的操作接口（手轮或扳手位）均朝向上方，便于操作人员从同一个方向进行观察和操作，尤其适合密集安装或位置不便的工况。

丁式三阀组紧凑型设计： 扁平化的阀体设计极大节省了安装空间，避免了侧向操作所需的活动半径，是安装空间有限时的理想选择。

核心保护功能： 核心功能与标准三阀组完全一致。通过内置的平衡阀，在操作过程中平衡差压变送器正负压室的压力，有效防止变送器膜片的单向过压损坏。

丁式三阀组安全隔离： 两个独立的截止阀可以隔离正负压引压管，实现仪表的不停车在线隔离、维护和校准。

丁式三阀组标准化流程： 遵循严格的操作顺序（先平衡，后操作隔离阀）以确保设备和人员安全。

丁式三阀组广泛应用： 适用于石油、化工、制药、电力等行业的压力、差压、流量和液位测量系统，特别适合于仪表安装空间紧凑的场合。

丁式三阀组与工式三阀组的对比摘要 (Comparison with In-Line Manifold)

特性工式三阀组 (In-Line 3-Valve Manifold)丁式三阀组 (Top-Mounted 3-Valve Manifold)结构阀门呈直线或微角度排列，阀杆方向不一所有阀杆垂直向上，集中于阀体顶部空间需要一定的侧向操作空间极其节省空间，扁平化设计，仅需上方操作空间操作操作时可能需要转换角度操作方便，所有手轮在同一平面，易于操作和观察适用场景通用场合，空间充足空间受限、仪表密集安装的场合

Product Overview of a Top-Mounted / T-Pattern 3-Valve Manifold

A Top-Mounted 3-Valve Manifold, also known in China as a Ding-Style  T-Pattern 3-Valve Manifold, is a common structural type of manifold. Its name comes  its resemblance to the Chinese character "丁" (Dīng),   the fact that its valve stems  actuators are mounted vertically on top of the body like "nails". It is a highly integrated  compact valve assembly designed for the connection  protection of differential pressure (DP) transmitters, DP flow meters,  other instruments.

Unlike in-line  H-pattern manifolds, the distinctive feature of the top-mounted manifold is that the stems of all three valves (two block valves  one equalizing valve) are arranged vertically upwards, all mounted on a flat, streamlined common body. This design gives it a significant advantage in space-constrained installation scenarios.

Key Features  Functions:

Top-Mounted Structure: All valve operating interfaces (handwheels  wrench flats) face upwards, allowing the operator to observe  manipulate all valves  the same direction. This is particularly beneficial for dense instrument clusters  hard-to-reach locations.

Compact Design: The flattened body profile greatly saves installation space  avoids the swing radius required for side-operated valves, making it an ideal choice  space is limited.

Core Protection Function: Its core function is identical to a standard 3-valve manifold. The integrated equalizing valve balances the pressure between the high  low-pressure chambers of the DP transmitter during operation, effectively preventing damage  over-pressure on one side of the transmitter's diaphragm.

Safe Isolation: The two independent block valves reliably isolate the high  low-pressure impulse lines, allowing for online isolation, maintenance,  calibration of the instrument without shutting down the process.

Standardized Procedure: It must follow the strict operating sequence (equalize first, then operate block valves) to ensure the safety of both equipment  personnel.

Wide Application: Suitable for pressure, differential pressure, flow,  level measurement systems in industries such as oil & gas, chemical, pharmaceutical,  power generation. It is especially suited for applications  instrument installation space is tight.