Schuyler McElrath, consultant, JASCSchuyler McElrath, consultant
Liquid fuel coking has always impacted the operational reliability of gas turbine engines by decrementing valve performance. When exposed to heat for prolonged durations, diesel transitions into coke which coats the internal surface of valves and restricts the movement of valve parts, leading to the loss of their basic opening and closing functionalities until they are overhauled, which, in turn, can be a cause of extended downtime.

This is where Jansen’ Aircraft Systems Controls (JASC) makes a world of difference. The company has developed a Water Cooled Three-Way Purge Valve that provides an effective solution for gas turbine owners seeking reliability improvements on liquid fuel systems. “Our high-quality yet affordable products deliver unparalleled performance that surpasses OEMs’ expectations and specifications requirements,” says Schuyler McElrath, consultant of JASC, who has over 40 years of experience in fluid control systems.

JASC’s innovative valve eliminates the problem of liquid fuel coking. It maintains sealing capability and operational consistency at high operating temperature and pressure. The outer water jacket and water cooled flange keep the valve cool enough to eliminate coking. More importantly, these Water Cooled Three-Way Purge Valves last more than five years and can be refurbished, unlike other valves that need to be replaced annually. All these benefits massively reduce the cost of operation.

What makes the Water Cooled Three-Way Purge Valve more interesting is its ease of installation. A standard configured fuel system can be easily upgraded to a water cooled variation in less than four days, or during a turbine outage. As an all-things-valves company, JASC’s product offerings include fuel system valves, purge air valves, valve monitoring and protection systems, water injection systems, and sealing products. The company continually evaluates all its products to identify the shortcomings and failure modes, and accordingly, makes design changes to improve the life expectancy and the performance of its offerings. “We rigorously test and evaluate each valve individually to ensure it conforms to the unique performance specifications defined by the clients,” adds McElrath.

JASC has recently expanded the product portfolio to include the Water Injection Check Valve for smaller machines with lower flows, and the F-Class Water Injection Check Valve for larger machines, with flows up to 15 GPM. The company has replaced all the elastic material, using metal-to-metal seating on the F-Class Water Injection Check Valve. This promises to keep the valve in ideal condition without internal degrading. Also, JASC’s Liquid Fuel Check Valve is contamination-tolerant, chatter-resistant and enhances fuel system reliability on dual-fuel turbine engines. The company has used a unique attenuation feature in its Liquid Fuel Check Valve design to keep it stable no matter what the pressure at the end of the valve.
  • We rigorously test and evaluate each valve individually to ensure they conform to the unique performance specifications defined by the clients


JASC recently developed zero-emission valve technology— ZEE equipment—which will allow clients to operate liquid fuel systems from light-off to full speed full flow without burning fuel in the turbine. It is even capable of re-circulating the fuel back to the engine tank. In essence, it is a proponent of zero emission and zero fuel costs. Helping clients reach the highest reliability and performance limit by improving the efficiency of their fuel systems, JASC aims to continually bring valve innovations to the ever-changing needs of the power generation industry. “We carefully invest in advanced tools, skills, and machinery, and implement measures within our manufacturing environment to increase efficiency and deliver highest value as possible to clients,” concludes McElrath