Power Plant Turbine & Header Drain Valves

1.Turbine&Header Drain Valve 2.Applying to HP&MP&LP Steam Pipeline 3.Anti-Erosion 4.Heat Elimination Structure 5.Stop Type

Fisher Pneumatic Diaphragm Operated Y Type Steam Turbine&Header  Drain Valve

  At startup of the turbine, the turbine drain valves are opened to insure that, at these low temperatures, any condensate that condenses in or before the turbine is immediately removed. As the steam temperature and pressure increase the drain valves are gradually throttled closed untial full power is reached. Once the turbine is in full operation the drain valves are fully closed and a tight shutoff is desirable.

  The drain valve service is one of the most severe application for any valve in a power plant.

Pressure range from ANSI Class 300lb to 4500lb

Temperature range from -100°F to 1200°F

Size range from 1/4"~4"

Design features:

1. Threaded bonnet, can be designed to be welded or removable structure          

2. Body and bonnet joint accurately machined.

3. Secondary throttling face design which reduces the erosion of sealing surface.

4. Intergral overlaying welding type seat.

5. Inclined stem and optimal runner design allows less fluid turbulence and higher flow coefficient values when compared to "T pattern" valves.

6. Special heat emission plate structure.

7. Hightly-density and shaped flexible graphite gasket.

8. Electric or pneumatic actuator is optional.

    

Technical Specification

Design and Manufacture Specifications	ASME B16.34
Flange Ends	ASME B16.5
Socket welding Ends	ASME B16.11
Butt-welding Ends	ASME B16.25
Inspection & Test	API 598, MSS SP61
Materials	ANSI/ASTM

Choice of High-Temperature Alloy Steel Materials 

No.	Names	Materials
1	Body	A182 F22
2	Disc	F22
3	Seal gasket	316 high flexible graphite
4	Stuffing box	F22
5	Bolt	ASTM B7
6	Nut	ASTM A29 1045
7	Stem	F22
8	Packing gasket	ASTM A276 410
9	Lock nut	ASTM A276 410
10	Steel ball	F304
11	Gland	ASTM A276 410
12	Packing	within Stainless steel Flexible graphite
13	Pressing sleeve	ASTM A276 410

Choice of Carbon Steel Materials

No.	Names	Materials
1	Body	A105
2	Disc	A105
3	Seal gasket	316 high flexible graphite
4	Stuffing box	A105
5	Bolt	ASTM B16
6	Nut	ASTM A29 1045
7	Stem	ASTM A276 410
8	Steel ball	ASTM A276 410
9	Lock nut	ASTM A276 410
10	Pressing sleeve	ASTM A276 410
11	Gland	ASTM A276 410
12	Packing	within stainless steel flexible graphite
13	Packing gasket	ASTM A276 410

Note: Other materials are available upon request.

Power Plant Turbine & Header Drain Valves