FAQ

• Lead time and MOQ for international orders?

  MOQ: As low as 50 pcs for standard models (lower for samples) 

  Lead Time: 

    In-stock items: 1-2 weeks 

    Bulk production: 4-6 weeks (FOB China) 

  Shipping: We support FOB, EXW, and DDP to EU, US, AU, and SEA. DDP quotes available upon request.

• Do the valves support OEM?

  Absolutely. 

  We support OEM and system integrators with: 

  - Standardized thread options: BSP (G1/2", G3/4") for EU/UK/AU, NPT (1/2", 3/4") for North America

  - Customization options: port orientation, open/close temperature, or laser engraving

  
  

  Just share your piping layout — our engineering team can assist with integration.

  
  

• Freeze Protection Valve VS Antifreeze Fluid

  Comparison Criteria	Freeze Protection Valve  (Automatic Drain-Back Type)	Antifreeze Fluid  (Glycol-Based Closed Loop)
  Comparison Criteria	Automatically drains water from collectors/pipes when temperature drops to 3-6°C, preventing freeze damage	Circulates antifreeze fluid (e.g., glycol) in a sealed loop; heats domestic water via a heat exchanger
  System Compatibility	Direct (open-loop) systems– ideal for retrofitting existing installations	Indirect (closed-loop) systems–requires full system design from the start
  Initial Cost	Low ($30–$80 per unit; simple installation)	High ($500+ for heat exchanger, expansion tank, pump, glycol, and labor)
  Maintenance Cost	Near zero (No consumables; purely mechanical)	Moderate to high(Glycol replacement every 3-5 years; pH/concentration monitoring; leak checks)
  Environmental Impact	Excellent No chemicals, only drains water; fully eco-friendly and compliant with green building standards	Fair to poor Ethylene glycol: toxic, hazardous to soil/water Propylene glycol: low-toxicity but still requires proper disposal
  Energy Consumption	Zero(Gravity-driven drainage; no electricity needed)	Required(Circulation pump runs continuously)
  Installation Complexity	Simple(Retrofit possible in <1 hour; minimal plumbing changes)	Complex(Full system redesign; best for new installations only)
  Climate Suitability	Mild or occasional frost zones(e.g., inland Australia, Southern Europe, southern China)	Severe cold climates(e.g., Northern Europe, Canada – long periods below -10°C
  Reliability	High (no electronics; low failure rate)	Moderate (depends on pump, sensors, and glycol condition)

  Typical Applications	• Residential solar water heaters (direct type) • Outdoor piping in heat pumps • Emergency eyewash/showers in seasonal climates	• New high-end solar thermal systems • Commercial heat pumps in cold regions
  Key Value Proposition	Low-cost, maintenance-free, eco-friendly upgrade for existing systems	All-weather reliability – best for new builds in harsh climates

  
  

• Why Choose Our Frost-Proof Valve?

  We are engaged in Freeze Protection Solutions for Solar Thermal & Heat Pump Systems over 20 years.

  Trusted by heat pump manufacturers in Germany, Australia, and the USA.