Introduction to PE Double Bleed Ball Valve

1. Structural Features

• All-plastic Construction: It mainly consists of a valve body, valve ball, valve stem, operating cap, and sealing ring. The valve body, connecting pipes, and valve seats are typically made of polyethylene; the valve ball, retainer ring, and operating cap are made of modified polypropylene; the valve stem is made of nylon; and the seals are made of nitrile rubber. As an all-plastic ball valve, it requires no anti-corrosion treatment and is rust-proof.
• Double Bleed Design: Equipped with two bleed ports, it is used to discharge media (such as gas) from the pipeline during maintenance or replacement operations, ensuring operational safety.
• Operating Mechanism: It is usually designed with a structure for easy ground operation. For example, the operating cap is marked with directions for opening and closing. Opening and closing can be performed on the ground using a wrench, which is easy to operate with low torque.

2. Working Principle

3. Performance Characteristics

• Excellent Sealing Performance: It adopts a reasonable upper and lower support structure for the valve core and high-quality sealing materials (e.g., multiple NBR rubber O-rings between the valve core and valve body), ensuring no internal or external leakage and high safety and reliability.
• Strong Corrosion Resistance: PE material has good corrosion resistance, enabling it to adapt to various corrosive media such as acids, alkalis, and salts. It also has excellent aging resistance and toughness, with a designed service life of up to 50 years.
• Easy Construction: It can be connected to PE pipes and pipe fittings via electrofusion or hot fusion. The connection performance is good, construction is simple, installation is convenient, and maintenance is relatively easy.
• Pressure and Temperature Adaptability: The nominal pressure is generally ≤0.5MPa, and the operating temperature range is -20℃~+40℃. The operating pressure under different temperatures is consistent with the requirements of PE pipelines.

4. Application Scenarios

• Urban Gas: Widely used in gas output pipelines, main pipelines, and branch supply pipelines. It is an ideal actuator for transporting and shutting off media in buried PE gas pipelines.
• Centralized Heating: Can be used in output pipelines, main pipelines, and branch pipelines of large-scale heating equipment, as well as for opening and closing pipelines and loops of heat exchangers.
• Other Fields: Also applicable to various fluid pipelines, waste gas discharge pipelines, gas and heat supply pipelines in steel plants, as well as various heat treatment pipelines, industrial gas pipelines, and heat pipelines in industrial equipment.

Beijing Songtiancheng Technology Co.,Ltd.was established in 2000 and is located in Fangshan Park,Zhongguancun,Beijing.We have been dedicated to the research and development and pro- duction of polyethylene(PE)valves and other components for municipal pipe networks.We are a national high-tech and Zhongguancun high-tech enterprise,as well as a Beijing specialized,re- fined,distinctive and innovative enterprise.Our company holds special equipment production qualifications and national laboratory accreditation (CNAS),and has participated in the formula- tion of national and industry standards on multiple occasions.

The company adheres to the business philosophy of"Safety first,Integrity first",and is dedicated to the research and development,design,production and sales of polyethylene(PE)valves for mu- nicipal pipe networks.After more than 20 years of continuous in-depth exploration,our company has developed the fourth-generation polyethylene(PE)valves suitable for domestic construction environments.It has now covered 31 provinces and municipalities directly under the Central Gov- ernment,239 prefecture-level cities,and over 700 gas companies,and has received unanimous praise from customers.At the same time,it has become the selected equipment supplier for key national projects such as the Beijing Daxing International New Airport Project,the 2021 Universal Studios Beijing project,the 2022 Winter Olympics venue project,the Xiongan New Area project in Hebei Province,and the 2023 Hangzhou Asian Games.