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{"title":"Pressure relief ball valve Dn355","imgUrl":"https:\/\/img.ismap.com\/nimg\/b5\/b1\/59d75ea1bf3c477cbc60edc9333c-200x200-1\/pressure_relief_ball_valve_dn355.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn355","Certification":"CE ISO9001","Place of Origin":"China"}}
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{"title":"Pressure relief valve Dn315","imgUrl":"https:\/\/img.ismap.com\/nimg\/00\/34\/17fd33f33c24becd4012b22dfb14-200x200-1\/pressure_relief_valve_dn315.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn315","Certification":"Quality Managment System Certification","Place of Origin":"China"}}
{"title":"PE Double Bleed Ball Valve","imgUrl":"https:\/\/img.ismap.com\/nimg\/a4\/17\/801c401d5d0073a7f5458ab9c578-200x200-1\/pe_double_bleed_ball_valve.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn315","Certification":"CE ISO9001","Place of Origin":"China"}}
{"title":"SDR11 PE Ball Valve with Double Bleed Ports","imgUrl":"https:\/\/img.ismap.com\/nimg\/9d\/31\/6b3bd22204d1384f1e5ffc54dfd7-200x200-1\/sdr11_pe_ball_valve_with_double_bleed_ports.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn630","Certification":"CE ISO9001","Place of Origin":"China"}}
{"title":"DN400 Non-Bleed Gear-Operated Valve","imgUrl":"https:\/\/img.ismap.com\/nimg\/29\/30\/cfcdbaf72a6162e2edb1faa87fc0-200x200-1\/dn400_non_bleed_gear_operated_valve.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn400","Certification":"CE ISO9001","Place of Origin":"China"}}
{"title":"DN400 Non-Bleed Gear-Operated Valve","imgUrl":"https:\/\/img.ismap.com\/nimg\/5c\/89\/f0116cbed1cf368301b83a8e1fa9-200x200-1\/dn400_non_bleed_gear_operated_valve.jpg","attrs":{"Brand Name":"BJSTC","Model Number":"Dn400","Certification":"CE ISO9001","Place of Origin":"China"}}
The PE double bleed ball valve operates on a double-eccentric structural design, which optimizes both media control and safe pressure relief. Its working mechanism can be broken down into two core functional processes: the "media on/off control" and the "double bleed (pressure relief) operation", as detailed below:
1. Basic Media On/Off Control
At the heart of the valve is a precision-engineered spherical core (valve ball) with a built-in flow channel and dedicated bleed grooves. When in use:
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
The defining "double bleed" feature is designed to safely release residual pressure or medium from the pipeline during maintenance, replacement, or emergency shutdowns—critical for operational safety:
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.
In summary, the PE double bleed ball valve integrates straightforward rotational control for media on/off with a specialized dual-bleed structure for safe pressure relief, making it well-suited for buried PE pipeline systems where reliability and operational safety are paramount.
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 Zho... 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 Zho...
