产品名称：工面连接三阀组

产品型号：DRCT3  1151

所属类别：仪表阀组>> 三阀组

所属系列：DR

安装尺寸图

工面连接三阀组

工面连接三阀组（也称为平面法兰连接三阀组或直接安装三阀组）是一种专为差压变送器设计的高集成度安装解决方案。其核心特点在于阀组底部与差压变送器的过程接口采用成对的平面法兰和金属缠绕垫进行连接，形成一个刚性的、无泄漏的整体结构，彻底取代了传统的引压管和接头连接方式。

这种设计旨在消除传统毛细管或引压管连接带来的各种问题，为压力、差压、流量和液位测量提供高等级的密封稳定性、测量精度和稳定性。

工面连接三阀组主要特点与功能：

工面法兰连接： 这是很明显的特征。阀组通过两个精加工的法兰面，使用螺栓直接刚性连接到差压变送器本体上对应的法兰接口。中间采用金属缠绕垫片实现高温高压下的金属硬密封，确保了连接的坚固性密封性，实现了零泄漏。

彻底消除引压管： 完全省去了传统的引压管、管接头和阀门，从根本上避免了因引压管堵塞、腐蚀、泄漏、积液、冻堵或气体聚集等引起的测量误差和维护问题。

工面连接三阀组测量性能：

超高精度： 极短的取压路径确保了压力信号无失真、无滞后地传递到变送器传感器。

工面连接三阀组超快响应： 系统容积极小，对过程压力的变化响应速度极快。

工面连接三阀组高稳定性与可信性： 大幅减少可能的故障点，几乎免维护，特别适用于高温、高压、危险或昂贵介质的场合。

工面连接三阀组紧凑一体化结构： 将三阀组（两个隔离阀和一个平衡阀）的功能与变送器的安装底座合二为一，结构极其紧凑，节省了大量空间，抗振性能很好。

工面连接三阀组核心保护功能： 保留了标准三阀组的全部功能，通过平衡阀和隔离阀的安全操作顺序，有效防止差压变送器膜片在投运、停运或校验时因单向过压而损坏。

工面连接三阀组高标准应用： 主要用于对安全和测量要求极其苛刻的场合，如石油化工的高压装置、油气田的井口控制、合成氨/乙烯等关键反应器、高温高压蒸汽流量测量以及核电站等。

与传统连接方式对比 (Comparison with Traditional Connection)

特性传统引压管连接工面法兰连接三阀组连接方式通过多头螺纹接头和引压管连接通过法兰和螺栓直接刚性连接密封性多个密封点，泄漏风险较高金属硬密封，接近零泄漏引压管存在，带来一系列问题完全消除测量性能响应慢，可能失真响应极快，精度极高安装空间需要较大空间布置引压管结构紧凑，空间需求极小维护性需维护引压管及相关接头几乎免维护适用工况通用场合高危、高压、高温、昂贵介质

Product Overview of a Flange-Mounted / Direct-Mount 3-Valve Manifold

A Flange-Mounted 3-Valve Manifold, also known as a Direct-Mount Manifold  Face-to-Face Connection Manifold, is a highly integrated installation solution specifically designed for differential pressure (DP) transmitters. Its core feature is that the bottom of the manifold connects to the DP transmitter's process interfaces using mated flat flanges  spiral-wound gaskets, forming a rigid, leak-free unitary structure that completely replaces traditional impulse piping  tubing connections.

This design aims to eliminate all the issues associated with conventional capillary  impulse line connections, providing the highest level of sealing reliability, measurement accuracy,  stability for pressure, differential pressure, flow,  level measurement.

Key Features  Functions:

Flange-to-Flange Connection: This is the most distinctive feature. The manifold is bolted directly  rigidly to the corresponding flange interfaces on the DP transmitter body via two machined flange faces. A spiral-wound gasket is used to achieve a metal-to-metal hard seal under high temperature  pressure, ensuring a robust connection  ultimate sealing integrity, resulting in zero leakage.

Complete Elimination of Impulse Piping: It entirely omits traditional impulse pipes, tubing fittings,  intervening valves, fundamentally avoiding measurement errors  maintenance issues caused by clogging, corrosion, leaks, liquid accumulation, freezing,  gas entrapment in impulse lines.

Exceptional Measurement Performance:

Superior Accuracy: The extremely short pressure path guarantees distortion-free  lag-free transmission of the pressure signal to the transmitter's sensor.

Ultra-Fast Response: The minimal system volume allows for extremely rapid response to process pressure changes.

High Stability  Reliability: Drastically reduces potential points of failure, making it virtually maintenance-free. It is particularly suited for high-temperature, high-pressure, hazardous,  expensive media.

Compact Integrated Structure: It integrates the functionality of a 3-valve manifold (two block valves  one equalizing valve) with the transmitter's mounting base. The structure is extremely compact, saves significant space,  offers excellent vibration resistance.

Core Protection Function: It retains all the functions of a standard 3-valve manifold. The safe operating sequence (using the equalizing valve before operating the block valves) effectively protects the DP transmitter's diaphragm  damage due to over-pressure on one side during start-up, shutdown,  calibration.

High-Standard Application: Primarily used in applications with extremely demanding safety  measurement requirements, such as high-pressure units in petrochemical plants, wellhead control in oil & gas fields, critical reactors (e.g., in ammonia  ethylene production), high-temperature/pressure steam flow measurement,  nuclear power plants.