Skip to Main Content

S400 Watts

Single Chamber Control Valve - Full Port with Mechanical Check

Series S400, S1400 are full port, single chamber basic valves that incorporate a two-piece telescoping disc and diaphragm assembly. This assembly is the only moving part within the valve allowing it to open, close, or modulate as commanded by the pilot control system. The lower portion of this two-piece assembly is a mechanical check feature, which acts independent of diaphragm position or pilot control system, and provides immediate check action when flow ceases. The Stainless Steel design offers superior corrosion resistance, as well as a lightweight alternative to conventional heavy iron valves. Stainless Steel construction provides extended diaphragm life, and reduces the frequency and labor costs associated with traditional maintenance repairs.


  • Lightweight Stainless Steel construction offers superior corrosion resistance for longer life
  • Mechanical check feature provides immediate check action when flow ceases
  • Simplified and efficient design is easy and economical to maintain
  • Two-piece disc and diaphragm assembly opens and closes as commanded by the pilot control system

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific S400