Precision Engine Controls Corporation

XVG

Gas Metering Fuel Valve

Today's high performance and low emission industrial gas turbine and reciprocating engines demand more than just reliable fuel control. They demand stable, fast and ACCURATE fuel flow control using a variety of supply pressures and gases.

Building on Precision Engine Controls' quarter century plus of electric fuel metering valve experience, the XVG (next generation gas valve) offers the latest technology in flow control, contamination resistance and precision control over a wide flow range, in a compact package.

Using integrated sensors, this flow-through design automatically compensates for variations in pressure and temperature providing the precise fuel flow demanded under varying conditions. Fuel flow measurement is as simple as reading the valve feedback. Valve feedback is given in terms of fuel flow; not valve position and is especially suited for DLE applications. The valve is programmable for flow versus demand. Complete closed-loop fuel control is possible when using the optional 4-20mA interfaces.

The 24 VDC integrated digital electronics features real-time health and data monitoring through an isolated, RS232 serial interface. A terminal block provides convenient interface for electrical installation.

The eXVG design is robust which translates into high reliability. The valve contains a single direct acting solenoid actuator with no mechanical linkages, and only one moving part. The flow tube design is balanced allowing smooth, fast valve operation over a wide pressure range.

The flow through, self cleaning action makes this valve contami- nation resistant. A fail-safe closing spring, and easy to clean, soft seats, provide a positive shut-off.

The smooth flow through design also results in superior flow performance. The high turn-down ratio allows operation over a wide range and low supply pressure. The XVG can handle fuel flow for industrial engines up to 10 MW (13,000 HP).

All these features are contained in a compact package that is a drop-in replacement for the widely successful Precision Engine Controls VG1.5 fuel metering valve.

Technical Specifications

Electrical Characteristics
Input Voltage	24 VDC
Minimum Voltage	16 VDC
Maximum Voltage	32 VDC
Steady State Current	2 A typical / 3 A maximum
Peak Current	5 A for 60 ms
Fuel Demand Analog Input:	Current 4 to 20 mA or Voltage 0 to 5 VDC
Fuel Flow Analog Feedback:	Current 4 to 20 mA or Voltage 0 to ±5 VDC
Serial Interface	RS232 (isolated)
Bandwidth	- 3 dB @ 10 Hz
Electrical Connections	0.75 - 14 NPTF threaded conduit to 16-26 AWG terminal block w/grounding provisions
Mechanical Characteristics
Fuel Media	Natural Gas or other man-made gases
Maximum Operating Pressure	435 psig (30 Barg)
Proof Pressure	1740 psig (120 Barg)
Minimum Controllable Flow	0.1% of Maximum Fuel Flow
Maximum Controllable Flow	8,000 pph at 300 psig
Leakage Flow	<1 pph
Flow Accuracy	±3% of full scale
Linearity	±1% of full scale
Step Response (10% to 90%)	< 100 ms
Dry Weight	< 38 lbs (17.2 Kg)
Environmental Characteristics
Temperature Limits	Ambient: -40°F (-40°C) to +200°F (93°C)
Fuel	-29°F (-20°C) to +257°F (125°C)
Weatherproof	NEMA 4 or IP65
Vibration	Mil-std-810F, Method 514-5, Category 22 (5 to 2000 Hz)
Shock	Mil-std-810F, Method 516.5, Procedure 1, (20 G peak, 11 ms duration)
Humidity	Mil-std-810F, Method 507.4 (95% Relative, Non-condensing)
EMC	Per 89/336/EEC European EMC Directive
Certifications	CSA (Canada and US): Class I, Division 1, Groups B, C and D; T4
European Directive
Compliance	II 2G EEx dII B + H2 T4; 97/23/EC Pressure Equipment (PED) 98/37/EC Machinery
Materials
Housing	6061-T6 Anodized Aluminum
Wetted Components	300 Series Stainless Steel NACE MR0175 Compliant
Seals	PTFE and Viton®