Auxiliary pilot plug Trim [APT]
- The APT trim is designed primarily for high pressure differential applications where tight shut-off is essential. Such applications include steam and water pressure reduction, steam throttling to atmosphere or to condenser, isolation, super-critical boiler start-up and variety of other uses in steam and water control system.
The design of the APT trim provides tight shut-off, excellent control and rangeability, but requires low actuator thrust which provides rapid response.
It is also lower in cost. The trim is basically a port throttling single seat design with main and pilot plugs working in APT.
The large main plug is the control device. Inside the main plug is the pilot plug connected rigidly to the valve stem, when closing the main plug seats first as a large balanced plug and this is rapidly followed by the closing of the pilot plug.
At this point, the plug from an unbalanced assembly and up stream pressure helps create high seating force resulting in reliable shut-off as high as class V. To open the actuator need only lift the small pilot plug to cause the main plug to once again become balanced.
HGXTG2 / X-trim Globe
| Construction | Heavy-duty Globe Pattern |
| Trim Form | X[iks]-trim Cage Balanced Type |
| Size | 2" to 26" [Option over 26"] |
| Rating | Class 150# to 4500# |
| Characteristic | Linear, EQ%, Mod-% |
| Seat Leakage | FCI 70-2 Class IV.V.VI |
| Typical Application | Feedwater Minimum Flow Control Valve Feedwater Main Control Valve |
HGXTG3 / X-trim Aux. Globe
| Construction | Heavy-duty Globe Pattern |
| Trim Form | X[iks]-trim Aux. Pilot Plug Type |
| Size | 2" to 26" [Option over 26"] |
| Rating | Class 150# to 4500# |
| Characteristic | Linear, EQ%, Mod-% |
| Seat Leakage | FCI 70-2 Class IV.V.VI |
| Flow Direction | Flow to Close |
| Typical Application | Feedwater Minimum Flow Control Valve Feedwater Main Control Valve |
Globe
Heavy-duty Body X[iks]-trim
Bonnet
Plain, Extension, Bellows Seal
Size
2"(50A) through 26"(650A) Over 26"(Option)
Pressure Rating (ANSI)
150,300,600,900,1500,2500,4500
Process Connection
FF,RF,RTJ,SW,BW,Others..
Trim Form
X[iks]-trim
Application
Severe Service, Feed-water start-up, Feed-pump recirculation,Feed-water main control