Emerson Yarway Fxt700 Series Steam Trap Instruction Manual

Yarway FXT700 Series Steam Trap
Instruction Manual

Before installation, these instructions must be carefully read and understood.

WARNING
Failure to follow these instructions or to properly install and maintain this equipment could result in property damage and personal injury or death.
The FXT700 Series Steam Trap must be installed, operated, and maintained in accordance with federal, state, and local codes, rules, and regulations, and Emerson instructions
If a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition.
Installation, operation, and maintenance procedures performed by unqualified personnel may result in improper adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Only a qualified person shall install or service the FXT700 Series Steam Trap.

SCOPE OF THE MANUAL

This manual provides instructions for installation, maintenance, and parts information for the FXT700 Series.

PRODUCT DESCRIPTION

The FXT700 Series are float and thermostatic steam traps. Float is free of levers, linkages, or other mechanical connections. This float is weighted to maintain orientation and acts as the valve is free to modulate condensate through the seat ring. The air vent is a balanced pressure design with stainless steel welded encapsulated bellows capable of discharging air and non-condensable gases continuously within 15°F (-9.4°C) of saturated temperature. The trap contains an integral strainer and stainless steel exhaust port sleeve.

SPECIFICATIONS

The specifications section on this page provides the ratings and other specifications for the FXT700 Series.

PRINCIPLE OF OPERATION

On startup, the thermostatic air vent (caged stainless welded bellows) is open, allowing air to flow freely through the vent valve orifice.
When condensate flows into the trap, the float rises, allowing condensate to be discharged. Once air and non-condensable have been evacuated, hot condensate will cause the thermostatic vent to close. Condensate will continue to be discharged as long as condensation occurs. During normal operation, an increase in the load causes the liquid level in the trap to rise. The float then rises and rolls off the seat ring, allowing more condensate to flow out. The float sinks as the condensate load decreases, moving nearer to the seat ring, decreasing the effective size of the orifice and allowing less condensate to discharge.
This provides smooth, continuous operation that reacts instantly to load variation while maintaining a water seal over the seat ring to prevent live steam loss.

INSTALLATION

Install the FXT700 Series Steam trap upright and in a horizontal line with the arrow on the body pointing in the direction of flow. The allowable inclination is 5° or less horizontally  and 5° or less at right angles to the plane of the pipeline.

MAINTENANCE

Due to normal wear that may occur, inspect the parts periodically and replace if necessary. The frequency of inspection depends on the severity of service conditions.

CAUTION
Inspection of the thermostatic bellows is not recommended as disassembly generally damages the unit.

1. Disassemble the steam trap. Remove the body bolts and place the lower body in a safe place.
2. Inspect the float and lower seat ring for damage and clean or replace as necessary.
   Clean the float with a rag and steel wool.
3. Clean the screen using a wire brush.
4. Replace bellows if needed. Use needle nose pliers or similar tools. Insert them into two of the three holes located in the bellows assembly and unscrew it from the upper body.
   NOTE
   When reassembling, use a thread locker on the bellows assembly threads.
5. After inspection/repair, reassemble trap, replace body gasket, and torquing bolts as specified. See Table 2.

FIGURE 2
FXT700 Series Stream Trap Operational Schematic

TABLE 1. MAXIMUM OPERATING PRESSURE

TABLE 2. FXT700 SERIES STREAM TRAP TORQUE VALUES

FIGURE 3
FXT700 Series Steam Trap Assembly

PARTS ORDERING

When corresponding with your local Sales Office about FXT700 Series Steam Trap, always reference the assembly number.
When ordering replacement parts specify the complete character part number from the following parts list.

PARTS LIST

TABLE 3. FXT700 SERIES PART NUMBER

TABLE 4. KEY 1, FXT700 SERIES BODY PART NUMBER

TABLE 5. KEY 7, FXT700 SERIES SEAT RING PART NUMBER

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The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as  warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions,  which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any  Emerson Electric Co. product remains solely with the purchaser.

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