Air Start Valves

Designed to handle a two-stage operation
for air starting of engines

The Seetru Air Start Valve (GS56)

Seetru Air Start Valves are high-quality control valves designed to handle a two-stage operation for air starting of engines. Air starting is typically used for diesel engines. The GS56 is bolted onto the air receiver vessel and integrates all the necessary functions and connections into one highly effective unit. It controls the charging of the pressure vessel with the air for starting and it controls the flow of the air to the engine to start the engine. Incoming air and outgoing air are kept separate to comply with regulations. The unit configuration is designed so that any oil or water in the air supply collects in the receiver, thus maximising the cleanliness of the air which flows to the engine.



View or Download Datasheet



GS56 Air-start valve

Technical Information for the GS56 Air-Start Valve

  • Air Inlet & Outlet Connections
    DIN or BS flanges or adapted to pipe fittings
  • Receiver Connection
    DIN or BS flange
  • Materials of Construction
    Cast body in SG iron, brass and stainless steel internal parts. Gunmetal or aluminium bronze body available upon request
  • Seal Material
  • Working Pressure
    Up to 600 psi`
  • Working Temperature
    Up to 110°C
  • Test Certification
    Included - supplied Free of charge

Economical in price and maintenance
Seetru can apply the latest large-scale manufacturing technologies to ensure economic first costs. Economy in use is ensured by the ease of installation and simple maintenance procedure.

Safety valve connection
A threaded connection is provided on the manifold unit for a safety valve to protect the air receiver. Safety valves can be supplied as optional extras, contact Seetru for information on our range of safety valves. (An enclosed discharge valve may be preferred where equipment is protected by a fire control system.)

Shut-off valve connection for pressure gauge
A connection with a shut-off valve is provided on the manifold unit for a pressure gauge, which can be fitted to monitor the pressure in the air receiver. Pressure gauges can be supplied as optional extras, contact us for information.

Integrated inspectors test point
A connection is provided for the connection of an inspector’s pressure test gauge.

Fusible plug thermal protection
The GS56 has the facility for a fusible thermal plug to protect the air receiver from over-pressure due to heat (e.g. In the case of fire). The plug fuses at a defined temperature and releases the pressurized air in the receiver. Plugs are supplied as optional extras.

Siphon drain valve
An optional siphon drain valve can be supplied with the GS56. This valve is connected to a long tube, which reaches low into the receiver vessel when opened, the pressure in the vessel forces any oil or water out through the tube.

Widely accepted worldwide approvals
Accepted by Lloyds for marine applications. Testing can be witnessed by marine approval authorities prior to despatch and certification is provided at extra cost. Compliant with the requirements of the European Pressure Equipment Directive, PED (CE marked).


View or Download the GS56 Air-Start Valve Datasheet

View or Download the GS56 Air-Start Valve Datasheet

View or Download the GS56 Air-Start Valve Datasheet

Seetru offers a wide range of downloadable datasheets for our products, including safety relief valves, liquid-level gauges, and sight glasses.  These datasheets provide detailed information on the technical specifications, features, and applications of Seetru products.  They are an essential resource for engineers, designers, and other professionals who need to select the right Seetru products for their specific needs.


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