Aviation High Liquid Level Shut-Off Valve type 413-01 | Cla-Val

Cla-Val 413-01 High Liquid Level / Fuel Discharge Valve

The Cla-Val 413-01 is a hydraulically operated, pilot-controlled diaphragm valve designed for aviation fuel systems. In standard configuration, it is installed downstream of a fuel/water filter-separator and isolates fuel flow when a float-operated switch detects excessive water accumulation in the sump.

Control Operation

The valve interfaces with a float-operated pilot. When water level rises, the pilot applies pressure to the auxiliary Hytrol valve chamber. Line pressure is then directed to the main valve chamber, causing the valve to close tightly. When pilot pressure is vented, the main diaphragm is relieved and the valve opens for full flow. The construction is fail-safe: in the event of diaphragm failure, the valve closes. Minimum required operating pressure is 4.54 psi (approx. 15 ft fuel column).

Technical Data

• Sizes: 1½”–8”
• Connections: Flanged ASA/ANSI
• Pressure ratings: 150 class up to 175 or 275 psi, 250 class up to 300 psi, 300 class up to 400 psi
• Operating temperature: -40 to +180 °F
• Media: Aviation fuels per MIL-5572 and MIL-T-5624
• Military specification: MIL-F-254D

Materials and Sealing

Body and cover are available in ASTM A536 ductile iron, ASTM A216 WCB cast steel, or cast aluminum 356-T6. Trim is bronze or stainless steel. Elastomers are Buna-N or Viton, selected based on fuel type and temperature. Single-seat design with resilient disc, no packing glands.

Applications

• Discharge of fuel/water filter-separators
• Aviation fuel hydrant systems
• Jet A-1 loading and distribution facilities
• Downstream line protection from water carryover
• Systems requiring automatic shutoff without electrical actuation

FAQ

What triggers valve closure?
Change in water/fuel interface level in the separator, detected by float control.

What components are included in the assembly?
Main Hytrol valve, ejector X47A or X50, auxiliary Hytrol valve, and X101 position indicator as standard.