High Performance Vacuum Negative- Pressure Safety Valve - SY Series Drain Valve – Convista

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High Performance Vacuum Negative- Pressure Safety Valve - SY Series Drain Valve – Convista Detail:

Performance Parameters

Nominal Diameter	3/4 “~4”
Nominal pressure	ANSI 150LB-4500LB
Body type	Y pattern of 45-degree angle
Body material	A105, F22, F91, F92, F316H
Bonnet	standard, cooling structure
Trim	integral stellate seat
Packing	Flexible graphite with stainless steel wire
Flow characteristics	quick opening
Two kinds of actuators are optional	pneumatic diaphragm actuator (pneumatic multi-spring and single-spring diaphragm actuator are optional as well as top-mounted and side-mounted handwheels) or piston actuator.

Valve Characteristics

1)Y-pattern forged body, little flow resistance, high CV value.

2)Disc with throttle piece, effectively protecting the sealing surface, extend valve life.

3)Disc & seat sealing surface are treated by special processing for anti-cavitation, anti-erosion.

4)Two guide rings in disc ensure stem bear balanced force, flexible movement to avoid jammed phenomenon.

5)High-quality flexible graphite packing GARLOCK imported, good chemical property and flexibility, low friction, long service life.

6)Fast switching speed, generally 3-5 seconds, effectively protect the system security, greatly reduce the time of the sealing surface eroded by the media.

7)Bonnet heatsink, sufficient cooling to protect pneumatic actuators and solenoid valve not affected by the high temperature. Chamber gasket clip wire the high mesh flexible graphite pad, better sealing performance and reliability than the average flexible graphite.

Application

Pneumatic steam drain valves area installed in the steam pipeline of thermal power plants, which can be divided in accordance with the mounting position as:

·Main steam line drain valves

·Hot reheat line drain valves

·Cold reheat line drain valves

·First stage, second stage, third stage, fourth stage, fifth stage and sixth stage extraction steam piping drain valves

Material table

Body	Seat	Disc	Stem	Stuffing Box	Packing
A105	A105+Stellite	F22+Stellite	410	A105	Flexible Graphite
F22	F22+Stellite	F22+Stellite	660	F22	Flexible Graphite
F91	F91+Stellite	F91+Stellite	660	F91	Flexible Graphite
F92	F92+Stellite	F92+Stellite	660	F92	Flexible Graphite
F316H	F316H+Stellite	F316H+Stellite	F316H	F316H	Flexible Graphite

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