The ZSY  electronically controlled pneumatic steam trap/drainage valve is an intelligent drainage unit integrating high-performance pneumatic actuation with electronic pilot control. It is specifically designed for high-pressure heater drainage, deaerator drainage, and condensate discharge in various thermal networks. By receiving electrical signals from DCS systems or level controllers, and utilizing solenoid valves or positioners, it converts pneumatic power into rapid mechanical displacement to move the plug. The ZSY series features specialized throttling and energy dissipation designs, effectively mitigating cavitation and flashing damage under high differential pressures. Combining electronic precision with pneumatic speed, this valve is widely used in high-temperature, high-pressure drainage systems across power, petrochemical, and paper industries.

Product Image of ZSY Solenoid-Controlled Pneumatic Steam Trap

1.Rapid response and shut-off:Equipped with high-thrust pneumatic actuators and electronic pilot control, the valve completes opening or closing within seconds after receiving a command. This sensitivity ensures real-time level control, preventing water hammer damage to turbines or heat exchangers.
2.Multi-stage throttling for energy dissipation:Internals utilize maze-type or multi-hole throttling structures to release pressure step-by-step. This design fundamentally suppresses cavitation and flashing, reduces noise levels, and significantly extends the life of sealing surfaces.
3.Superior sealing and erosion resistance:The plug and seat sealing surfaces are fully hard-faced with Stellite cobalt-based alloy for extreme hardness. Combined with a single-seat structure, it ensures zero leakage in the closed position, minimizing energy loss in thermal systems.
4.Intrinsic safety and fail-safe protection:Driven by compressed air, the valve is naturally explosion-proof. Built-in heavy-duty springs allow for fail-close or fail-open logic, ensuring the system automatically returns to a safe position during power or air supply failure.
5.Integrated intelligent control logic:Supports 4-20mA regulation and real-time feedback when equipped with smart positioners and limit switches. This facilitates remote monitoring and precise logic interlocking within modern Industrial IoT environments.
6.Durable pressure-resistant housing:Bodies are made of premium cast steel or alloy steel, meeting strict high-pressure standards. Flanged or welded connections ensure structural integrity under frequent high-temperature cycles.
7.Precision guiding and stability:Utilizes cage-guided or long-stroke top-guided structures to ensure excellent concentricity. This eliminates vibrations caused by lateral fluid forces and maintains stability during regulation.
8.Modular rapid maintenance:Scientific connection between actuator and body, combined with modular internals, allows for vertical extraction of components from the top without removing the valve from the line, reducing O&M costs.

Structural Drawing of ZSY Solenoid-Controlled Pneumatic Steam Trap

List of Component Names and Materials

Performance Specification Sheet

Standard requirements for external dimensions

Butt-Welding (BW) End dimensions shall comply with ANSI B16.25.

Socket-Welding (SW) dimensions shall comply with ANSI B16.34.

Socket-Welding (SW) size range: 1/2″ – 2-1/2″.

Butt-Welding (BW) size range: 1/2″ – 4″.

Testing and Inspection Standard: JB/T 3595.

Outline dimension table（Unit：mm）

Due to the rapid R&D iteration speed of valve products from China Kaivex Valve Group Co., Ltd., the above technical parameters and specification documents, including product overview, features, parts materials, outline dimension charts, CAD drawings, and product instruction manuals, are for your reference only. For actual applications, please contact our valve sales engineers to obtain the support you need for free. Thank you!