H式天然气计量五阀组

产品名称：H式天然气计量五阀组

产品型号：DCCH6

所属类别：仪表阀组 >> 天然气计量五阀组

所属系列：DC

H式天然气计量五阀组

H式天然气计量五阀组是一种专为天然气贸易计量站场及关键过程控制点设计的高性能、高安全性集成阀组。因其阀体内部流道与外部连接件整体呈“H”型布局而得名。它是天然气计量系统中连接差压式流量计（如孔板、喷嘴、文丘里管等）、压力变送器、温度变送器与工艺管道的核心枢纽设备。

其核心功能是在不影响生产流程的前提下，实现仪表的在线投用、隔离、校准、排污和排空，并确保操作过程中的安全，防止天然气泄漏，保障计量准确性和设备完整性。

H式天然气计量五阀组主要特点与功能：

高安全性设计： 专为天然气等易燃易爆、高压介质设计。采用防吹扫阀杆、高强度合金阀体、金属对金属密封或高性能软密封，确保零泄漏和高承压能力，满足苛刻工况要求。

H式天然气计量五阀组一体化集成结构： 将五个功能阀（两个过程隔离阀、一个平衡阀、两个排污/排气阀）精密集成在一个紧凑的锻钢阀体上。结构紧凑，减少了多个单独阀门连接可能带来的泄漏点，安装更方便，占用空间小。

H式天然气计量五阀组标准操作流程：

仪表投用： 先打开平衡阀，平衡差压变送器正负压室压力，然后依次打开高压侧和低压侧隔离阀，关闭平衡阀结束。

仪表隔离： 先打开平衡阀，然后依次关闭高压侧和低压侧隔离阀，即可将仪表与过程管道安全隔离，进行维护或拆卸。

H式天然气计量五阀组在线排污： 通过操作两个排污阀，可分别对正负压引压管进行吹扫或排污，清除积液和杂质，让引压管畅通和计量准确。

H式天然气计量五阀组保障计量精度： 通过平衡阀的合理操作，避免差压变送器的单向过压，保护精密传感器。定期排污功能确保引压管内介质纯净，从根源上减少测量误差。

H式天然气计量五阀组广泛应用： 主要应用于天然气输送管道、城市门站、分输站、调压站、液化天然气（LNG）厂、压缩天然气（CNG）母站等需要进行贸易计量或关键过程控制的场合。

Product Overview of an H-Pattern Natural Gas Metering 5-Valve Manifold

An H-Pattern Natural Gas Metering 5-Valve Manifold is a high-performance, high-security integrated valve assembly specifically designed for natural gas fiscal metering stations  critical process control points. It is named for its "H" pattern layout formed by the internal flow channels  external connectors. It serves as the central hub in natural gas metering systems, connecting differential pressure (DP) flow meters (e.g., orifice plates, nozzles, Venturi tubes), pressure transmitters,  temperature transmitters to the process piping.

Its core function is to enable the online commissioning, isolation, calibration, venting,  draining of instruments without interrupting the production process. It ensures absolute operational safety, prevents natural gas leaks,  safeguards measurement accuracy  equipment integrity.

Key Features  Functions:

High-Safety Design: Specifically engineered for flammable, explosive,  high-pressure media like natural gas. It features blow-out-proof stems, high-strength alloy valve bodies,  metal-to-metal  high-performance soft seals to guarantee zero leakage  high pressure-bearing capacity, meeting demanding service requirements.

Integrated Unitized Structure: Integrates five functional valves (two process block valves, one equalizing valve,  two vent/drain valves) precisely into a single compact forged steel body. This compact structure reduces potential leak points associated with multiple separate valve connections, simplifies installation,  saves space.

Standardized Operating Procedure:

Commissioning the Instrument: First open the equalizing valve to balance pressure across the DP transmitter. Then open the high-pressure  low-pressure block valves sequentially. Finally, close the equalizing valve.

Isolating the Instrument: First open the equalizing valve. Then close the high-pressure  low-pressure block valves sequentially. This safely isolates the instrument  the process line for maintenance  removal.

Online Blowdown/Draining: By operating the two drain valves, the high-pressure  low-pressure impulse lines can be purged  drained separately to remove accumulated liquid  contaminants, ensuring clear impulse lines  accurate measurement.

Ensures Measurement Accuracy: The proper operation of the equalizing valve prevents over-ranging the DP transmitter's sensitive sensor. The regular draining function ensures the medium inside the impulse lines remains pure, reducing measurement errors at the source.

Wide Application: Primarily used in applications requiring fiscal metering  critical process control, such as natural gas transmission pipelines, city gate stations, distribution stations, pressure regulation stations, LNG plants,  CNG mother stations.

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