Working Principle of PE Double Bleed Ball Valve

1. Basic Media On/Off Control

• Opening the Valve: When the operator rotates the valve stem (via the ground-mounted operating cap, typically with a wrench), the valve ball rotates accordingly. As the ball turns, its internal flow channel gradually aligns with the inlet and outlet ports of the valve body. This alignment creates an unobstructed path for the medium (e.g., gas, heating fluid) to flow through the valve, realizing the "open" state of the pipeline.
• Closing the Valve: Rotating the valve stem in the opposite direction twists the valve ball, misaligning its internal flow channel with the valve’s inlet/outlet. The solid surface of the valve ball then presses tightly against the valve seats (sealed with high-performance materials like NBR rubber). This tight contact forms a reliable seal, blocking the medium flow and achieving the "closed" state to cut off the pipeline.

2. Double Bleed (Pressure Relief) Operation

• Bleed Port Activation: The valve is equipped with two independent bleed ports (one usually near the inlet side, the other near the outlet side, or at positions to cover upstream and downstream pipeline sections). Each bleed port is paired with a small control valve (bleed valve) for easy operation.
• Pressure Relief Process: When pressure relief is needed (e.g., before disassembling the pipeline), the operator opens the relevant bleed valve(s). This action connects the bleed port to the valve’s internal cavity (or directly to the pipeline). Residual medium or pressure in the pipeline then flows out through the open bleed port, gradually reducing the internal pressure to a safe level.
• Dual Bleed Advantage: Having two bleed ports allows for targeted relief (e.g., relieving upstream pressure separately from downstream pressure) or faster overall pressure release, minimizing risks of medium leakage or equipment damage during maintenance.

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.