一、进口内螺纹蒸汽减压阀（丝扣减压阀）概述

进口内螺纹蒸汽减压阀（丝扣减压阀）是指采用内螺纹连接方式的蒸汽减压阀，也叫丝扣减压阀，一般采用G螺纹连接，也可以是NPT螺纹或者PT螺纹，材质有铸钢或者不锈钢，口径一般是DN15-50，属于先导活塞式减压阀。由主阀和导阀两部分组成。主阀主要由阀座、主阀盘、活塞、弹簧等零件组成。导阀主要由阀座、阀瓣、膜片、弹簧、调节弹簧等零件组成。通过调节调节弹簧压力设定出口压力、利用膜片传感出口压力变化，通过导阀启闭驱动活塞调节主阀节流部位过流面积的大小，实现减压稳压功能。
进口内螺纹蒸汽减压阀（丝扣减压阀）加大了活塞面积，改变了节流结构，改变了密封形式，改进了导阀结构和调节弹簧形式，从而从以下几方面提高了产品的性能。
1、提高了对出口压力变化的传感效能，提高了灵敏度，大大降低了因上游压力变化，流量变化等因素引起的压力偏差。
2、改善了流线分布，降低了噪声。
3、改进了密封面结构，延长了密封面寿命。
本产品主要用于蒸汽管路，适用于进口压力变化大，流量变化大的蒸汽管路。

Internal thread steam pressure reducing valve (threaded pressure reducing valve) refers to a steam pressure reducing valve that uses internal thread connection, also known as a threaded pressure reducing valve. It generally uses G thread connection, can also be NPT thread or PT thread, and is made of cast steel or stainless steel. The diameter is generally DN15-50, and it belongs to the pilot piston type pressure reducing valve. It consists of two parts: the main valve and the pilot valve. The main valve is composed of parts such as valve seat, main valve disc, piston, spring, etc. The pilot valve is mainly composed of parts such as valve seat, valve disc, diaphragm, spring, and regulating spring. By adjusting the spring pressure to set the outlet pressure, using the diaphragm to sense the change in outlet pressure, and driving the piston to adjust the size of the flow area at the throttle position of the main valve through the opening and closing of the pilot valve, the pressure reducing and stabilizing function is achieved.

The imported internal thread steam pressure reducing valve (threaded pressure reducing valve) has increased the piston area, changed the throttling structure, changed the sealing form, improved the guide valve structure and adjusting spring form, thereby improving the performance of the product from the following aspects.

1. Improved sensing efficiency for outlet pressure changes, increased sensitivity, and greatly reduced pressure deviation caused by upstream pressure changes, flow rate changes, and other factors.

2. Improved streamline distribution and reduced noise.

3. Improved the sealing surface structure and extended the service life of the sealing surface.

This product is mainly used in steam pipelines, suitable for steam pipelines with large changes in inlet pressure and flow rate.

二、进口内螺纹蒸汽减压阀（丝扣减压阀）主要技术参数和性能指标

三、进口内螺纹蒸汽减压阀（丝扣减压阀）主要零件材料