Singer A Type-4 One-way Flow Altitude w/ Differential Control

Ideal for maintaining preeset maximum water level

There are many different variations available to fit your specific needs. Please Contact Us for a free quote or consultation.

106 / 206-A-Type 4 One-Way Flow Altitude Control Valve with Differential Control


  • No overflows
  • Adjustable draw-down level (differential) set-point
  • Superior repeatability
  • Positive shut-off - Drip tight
  • Adjustable draw-down for improved water cycling
  • Functions as a two position control valve, either fully open or fully closed
  • Based on 106-PG and 206-PG main valves

Note: This valve does not operate as a check valve to prevent reverse flow.


  • The valve shall be a Singer Valve model 106-A-Type 4 / 206-A-Type 4, size “_____”, ANSI Class 150 (ANSI 300, ANSI flanges drilled to ISO PN 10 / 16/ 25 or 40) pressure rating / flange standard, globe (angle), style valve. The Model 301-4 Altitude Pilot spring range (elevation) shall be “___ to ___” feet / meters, with set-point preset at Singer Valve to “___” feet / meters. The Model 106-RD differential (delayed opening) range shall be “___” to “___” feet / meters, with set-point preset at Singer Valve to “___” feet / meters. Assembly shall be according to Schematic A-0415C.
  • The valve allows normal forward flow to fill the reservoir to the maximum level then closes drip-tight at the set-point. It opens to refill the tank once the level drops an adjustable distance below the high water level.
  • Refer to Main Valve section, see page 11, 106-PG (or 206-PG) and “Main Valve options” section, Model X107 Position Indicator for detailed information pertaining to valve sizes and materials, selection criteria and specifications.
  • Refer to Pilot and Accessories section, see page 249, Model 301-4 Altitude Pilot for detailed information pertaining to materials and specifications. Model 106-RD Pilot specification information, is available from Singer Valve only at this time.


Download the 106 / 206-A-Type 4 Product Guide.

Download the 106 / 206-A-Type 4 Operations Guide.

Singer FAQ and Troubleshooting Singer White Papers
Singer Projects and Solutions Singer Technical Sizing Info
Singer Full Product Catalogue Singer Training Videos

Singer Operation, Troubleshooting Charts, Lifting Instructions
Singer Interactive Valves in Action Learning App