Pneumatic Operated Y-Pattern Turbine&Header Drain Valve

1,Pneumatic Y-pattern steam drain valve 2,Power generatoin application 3,ANSI 150#~~4500# 4,NPS 1/2"~5" 5,Butt Weld

Pneumatic Operated Y Type Turbine&Heater Drain Valve

Design & manufacture: ASME B 16.34

Inspection and test: API 598  MSS SP61

Connection end: Socket welding end,   ASME B 16.11

                           Butt welding end,    ASME B 16.25

                           Flange end,        ASME B 16.5

 Operating Conditions

    The drain valve service is one of the most severe applications for any valve in a power plant. These valves normally see a wide range of conditions; forst cool condensate, followed by ever increasing pressure and temperature that causes the condensate to flash into steam and ultimately high pressure and temperature steam. The outlet condition is condenser vacuum.

    One of the main considerations in this application is seat leakage. During turibine operation this valve is closed against a high pressure with a vacuum on the outlet. Seat leakage is not only expensive from a maintenance standpoint but the cost of generationg turbine grade steam is expensive as well.

    The power industry has determined that a throttling control valve in this application will improve the reliability and efficiency of this type drain system.

Design features

1. Overall welding-type seat

2. Highly-density and shaped flexible graphite gasket

3. STELLITE cobalt-base ironbound alloy disc

4. Y type design possess optimizing Cv value

5. Special designed packing case

6. Overlaying welding sealing face with special technics

7. Special heat emission plate structure.

8. Bonnet is screwed and welded to the body.

9. The design of Y pattern body with inclined stem allows less fluid turbulence and higher flow coefficient values when compared to T pattern valves.

Choice of High-Temperature Alloy Steel Materials

No.	Names	Materials
1	Body	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 A276 410
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

Pneumatic Operated Y-Pattern Turbine&Header Drain Valve