1、 Product Overview

Gas liquid linkage welded fixed ball valve is a key control equipment for medium and high pressure transmission systems, widely used in the fields of oil and gas, petrochemicals, urban gas, electricity, etc. It is suitable for working conditions with a diameter range of DN50~DN1200 and pressure levels of PN16~PN420. This product adopts an integral welded valve body structure, combined with a pneumatic hydraulic drive mode, to achieve safe, efficient, and automated control of the medium fluid.

The main materials of the valve body include carbon steel A105, stainless steel CF8, CF8M, CF3, etc., which have good pressure resistance, temperature resistance, and corrosion resistance. Special alloy steel materials can also be selected as needed for special medium applications.

2、 Structure and Performance Characteristics

1. Fixed ball structure

The valve adopts a fixed spherical design, which is supported by upper and lower bearings and moves more smoothly relative to the sealing pair. It is particularly suitable for opening and closing control under high-pressure and large-diameter conditions, significantly reducing operating torque and extending service life.

2. Fully welded valve body structure

The valve body adopts a fully welded integrated structure to avoid flange connection leakage points, suitable for underground installation and high-pressure transmission occasions, with strong resistance to erosion and stress. The conventional materials are A105 (carbon steel) and CF8M (stainless steel), and special materials such as acid and alkali resistance and sulfur resistance can be customized according to the conveying medium.

3. Pneumatic hydraulic drive system

The actuator adopts high-performance pneumatic-hydraulic technology and is suitable for operating conditions requiring fast control response. It supports remote control and automatic switching between control modes, making it ideal for integration into industrial automation systems such as DCS and SIS. The design ensures high control stability and incorporates redundant safety features.

4. Sealing and temperature adaptability

According to the system operating conditions, enhanced soft sealing materials (such as PTFE, PPL) or metal valve seat structures can be selected, and the sealing level can meet testing standards such as API 598 and ISO 5208. After matching the material and sealing form, the working temperature range of the product can generally reach -29 ℃~+200 ℃, depending on the material selection scheme.

5. Fire resistant structure and reserved design for electrostatic protection

The product structure has fire-resistant design capabilities based on API 607 or API 6FA standards. Some models can be equipped with fire-resistant secondary sealing structures and electrostatic bypass devices (such as metal conductive springs) to enhance safety protection performance under high temperature and combustible medium transportation conditions. It is recommended to confirm the specific certification scope and adaptation configuration before placing an order.

3、 Application scenarios

This series of ball valves is suitable for the following typical working conditions:

Natural gas long-distance and distribution pipeline system

Cut off or interlock control of petroleum refining equipment

Transportation of special media such as liquefied gas, hydrogen, and high-temperature gases

Urban gas pressure regulating station and regional control system

Medium voltage automation control valve station for power and chemical systems

The specific application should be selected and configured based on the actual working conditions, medium characteristics, and safety requirements on site.

With the continuous improvement of industrial process automation and intelligence, the pneumatic hydraulic welded fixed ball valve has become an indispensable core control component in key links due to its structural safety, control sensitivity, and excellent sealing performance. Zhejiang Fxflow Fluid Control Co., Ltd. will continue to provide reliable fluid control solutions to users with strict quality control, advanced manufacturing processes, and professional technical services, helping the industry develop safely and efficiently.