产品名称：内螺纹二阀组

产品型号：SS-F2

所属类别：仪表阀组 >> 两阀组

所属系列：DC

M211W-内螺纹二阀组安装尺寸图

内螺纹二阀组

内螺纹二阀组是一种结构紧凑、安装简便的集成式过程阀门组件，其核心特征是阀体的过程接口采用内螺纹（如NPT、G、BSPP等螺纹标准），用于直接连接带外螺纹的管道、仪表或设备。它将两个功能阀门（通常是两个截止阀）集成在一个阀体上，为仪表的压力接口提供基本的隔离和泄压功能。

该阀组主要用于中低压工况，是压力变送器、压力开关、压力表等现场仪表经济的配套阀门之一，旨在简化安装、节省空间并提高连接稳定性。

内螺纹二阀组主要特点与功能：

内螺纹连接： 阀体进出口端加工有 female threads，可直接旋拧在带 male threads 的工艺管道接头或仪表接口上，无需额外的法兰、活接头或转接件，安装非常快捷方便。

基本隔离功能： 两个独立的截止阀（通常是球阀或针阀）可以切断工艺介质，实现对所连接仪表的隔离，以便进行在线维护、更换或校准。

内螺纹二阀组集成泄压/排气： 许多内螺纹二阀组在设计上会集成一个微型的排污或排气孔（通常位于阀体侧面或阀杆根部），或在操作时可通过稍微松开连接螺纹进行泄压，确保在拆卸仪表前释放残留压力，保障操作安全。

内螺纹二阀组紧凑与经济： 一体化结构省略了单独的阀门和连接件，极大地节省了安装空间，减少了潜在的泄漏点，同时具有成本效益高的优势。

内螺纹二阀组操作简单： 通常采用手柄或手轮进行90度（球阀）或多圈（针阀）操作，启闭直观方便。

广泛应用： 适用于水处理、暖通空调（HVAC）、一般工业过程控制、机械设备液压/气动系统等压力不高、非剧毒、非强腐蚀性介质的测量与控制回路。

典型应用示意图 (Typical Application Schematic)

压力变送器安装 (Pressure Transmitter Installation):

[工艺管道] -> (带外螺纹的接头) -> [内螺纹二阀组] -> (带外螺纹的变送器接口) -> [压力变送器]

功能序列 (Function Sequence):

正常测量： 两个阀门均处于开启状态。

隔离仪表： 关闭两个阀门，即可安全地拆卸变送器。

泄压（如具备）： 在关闭阀门后，通过微排阀或微微松开阀组与接头连接处，释放阀组与变送器之间的 trapped pressure。

校准： 关闭阀门后，可在仪表侧连接校准设备进行在线校准（需注意风险）。

可选类型 (Optional Types):

双球阀型 (Dual Ball Valve Type): 操作快速，流阻小。

双针阀型 (Dual Needle Valve Type): 可进行精细的流量调节，通常密封性更好，适用于较高压力。

一球一针型 (One Ball, One Needle Type): 球阀用于隔离，针阀用于精细调节或泄放。

Product Overview of a Female Threaded 2-Valve Manifold

A Female Threaded 2-Valve Manifold is a compact easy-to-install integrated process valve assembly. Its key feature is that the process connections on the valve body utilize female threads (conforming to standards like NPT, G, BSPP, etc.) for direct connection to piping, instruments, equipment with male threads. It integrates the functions of two valves (typically two block valves) into a single body, providing basic isolation pressure relief for instrument pressure connections.

This manifold is primarily used for low to medium-pressure services is one of the most common economical valve accessories for field instruments such as pressure transmitters, pressure switches, pressure gauges. It is designed to simplify installation, save space, improve connection reliability.

Key Features Functions:

Female Threaded Connections: The inlet outlet ports of the valve body are equipped with female threads, allowing it to be screwed directly onto male-threaded process pipe fittings instrument ports. This eliminates the need for additional flanges, unions, adapters, making installation quick straightforward.

Basic Isolation Function: The two independent shut-off valves (usually ball valves needle valves) can block the process medium, enabling the isolation of the connected instrument for online maintenance, replacement, calibration.

Integrated Pressure Relief/Venting: Many female threaded 2-valve manifolds are designed with an integrated miniature bleed/vent port (often located on the side of the body near the stem root). Alternatively, pressure can be relieved by slightly loosening the connection threads before disassembly, ensuring residual pressure is released for operational safety.

Compact Economical: The unitary design eliminates separate valves connections, significantly saving installation space, reducing potential leak points, offering high cost-effectiveness.

Simple Operation: Typically operated by a lever (for ball valves, 90-degree turn) a handwheel (for needle valves, multi-turn), making opening closing intuitive convenient.

Wide Application: Suitable for measurement control loops in water treatment, HVAC (Heating, Ventilation, Air Conditioning), general industrial process control, machinery hydraulic/pneumatic systems, pressures are extreme, media are non-toxic non-highly corrosive.