产品名称：W式五阀组

产品型号：DCCW5

所属类别：仪表阀组 >> 五阀组

所属系列：DC

安装尺寸图

W式五阀组

W式五阀组是一种集成度更高、功能更全面的过程仪表阀组，其名称源于阀体内部流道与外部连接端口整体布局呈“W”形或“双W”形态。它是三阀组功能的扩展，专为要求更高安全性、更多在线维护功能的关键测量点而设计，尤其是在高压、危险介质（如天然气、氢气、有毒化学品）或贸易计量场合。

W式五阀组将五个阀门（两个过程隔离阀、一个平衡阀、两个排污/校验阀）精密地集成在一个坚固的阀体内，为差压变送器提供全面的保护、隔离、在线校验和排污吹扫功能。

W式五阀组主要特点与功能：

双重密封与安全保障： 专为苛刻工况设计。通常采用双阀座密封（Double Block & Bleed）理念，通过两个隔离阀和一个排污阀的组合，可在两个隔离阀之间形成一道可见的泄放腔，彻底隔离工艺介质并验证密封性，实现零泄漏隔离，安全等级好。

在线校验与排污： 两个独立的排污/校验阀（通常位于阀组底部）功能强大：

W式五阀组在线校验： 可在不停车的情况下，连接校验设备，对压力或差压变送器进行在线精度校验。

排污吹扫： 可分别对正、负压引压管进行排污，清除积液、杂质或冷凝物，确保引压管畅通，保障长期测量精度。

泄压功能： 在隔离仪表前，可通过此阀安全地释放引压管内的压力。

核心平衡功能： 平衡阀用于在投运或停运差压变送器时，平衡其膜片两侧的压力，防止单向过压损坏，这是保护精密变送器的核心功能。

一体化紧凑设计： 将多个功能集成于一体，减少了大量的法兰、接头和泄漏点，结构紧凑，安装方便，稳定性远高于分散的单个阀门组合。

W式五阀组高标准应用： 主要应用于石油天然气贸易计量（Fiscal Metering）、化工过程关键控制点、高压系统、以及任何需要高安全性和在线维护能力的场合。

功能阀门说明 (Function of Valves):

一个典型的W式五阀组通常包括：

高压侧隔离阀 (High-Pressure Block Valve)

低压侧隔离阀 (Low-Pressure Block Valve)

平衡阀 (Equalizing Valve)

高压侧排污/校验阀 (High-Pressure Vent/Drain Valve)

低压侧排污/校验阀 (Low-Pressure Vent/Drain Valve)

Product Overview of a W-Pattern 5-Valve Manifold

A W-Pattern 5-Valve Manifold is a more highly integrated  functionally comprehensive process instrument valve assembly. Its name derives  the "W"  "double-W" shape formed by the internal flow channels  external connection ports. It is an evolution of the 3-valve manifold, specifically designed for critical measurement points that demand higher safety  greater online maintenance capabilities, especially in high-pressure services, with hazardous media (e.g., natural gas, hydrogen, toxic chemicals),  for fiscal metering applications.

This manifold integrates five valves (two process block valves, one equalizing valve,  two vent/drain/calibration valves) precisely into a robust body, providing comprehensive protection, isolation, online calibration,  purging/blowdown functions for differential pressure (DP) transmitters.

Key Features  Functions:

Double Seal  Safety Assurance: Engineered for severe service. It often incorporates a Double Block  Bleed (DBB) philosophy. The combination of two block valves  one bleed valve creates a visible bleed cavity between them, allowing for complete isolation of the process medium  verification of seal integrity. This achieves zero leakage isolation  the highest safety standard.

Online Calibration  Blowdown: The two independent vent/drain valves (typically located at the bottom) are highly functional:

Online Calibration: Allows connection to calibration equipment to perform online accuracy checks on pressure  DP transmitters without shutting down the process.

Purging/Blowdown: Enables independent purging  draining of the high  low-pressure impulse lines to remove accumulated liquid, contaminants,  condensate, ensuring clear impulse lines  maintaining long-term measurement accuracy.

Pressure Relief: Allows for the safe venting of pressure  the impulse lines before isolating the instrument.

Core Equalizing Function: The equalizing valve is used to balance pressure on both sides of the transmitter's diaphragm during start-up  shutdown, preventing damage  over-pressure on one side. This is the core function for protecting the sensitive transmitter.

Integrated Compact Design: Integrating multiple functions into a single unit significantly reduces the number of flanges, fittings,  potential leak points. Its compact structure simplifies installation  offers far greater reliability than a configuration of individual valves.

High-Standard Application: Primarily used in oil  gas fiscal metering stations, critical chemical process control points, high-pressure systems,  any application requiring high safety integrity  online maintenance capabilities.