HP trip system AST Solenoid Valve Z2805013

Date:2020/9/11 14:47:41 Visits: Author:Dongfang YOYIK Engineering Co; Ltd,

When AST solenoid valves are in normal operation, they are energized and closed by excitation, thus closing the EH Oil system drain channel on the automatic shutdown emergency interrupt (AST) main pipe, so that the oil pressure in the lower cavity of the piston of all steam valve actuators can be established . When the solenoid valve is de-energized and opened, the main pipe will drain oil, causing all steam valves to close and the turbine to stop. AST solenoid valves are arranged in series and parallel, so there are multiple protections. At least one solenoid valve in each channel must be open to cause shutdown. At the same time, the reliability is improved. Any one of the four AST solenoid valves is damaged or refused to operate, and it will not cause downtime.


The use of advanced technology, absolutely first-class service quality, is our constant faith over the years. Production is in strict accordance with national standard, line standard and technical standards. The main technical backbone are retired senior engineer and senior technicians who has participated in the design, manufacture and installation of Gezhouba, Ertan, Three Gorges and other power plants. We have served hundreds of hydropower stations, thermal power plant overhaul, and technical transformation to provide high quality equipment, construction design, installation, spare parts, and after-sales service.



YOYIK provides multiple types of spare parts and equipments for power plant :

Solenoid valve coil CCP 024D

cooling oil pump 

Rotation speed sensor CS-2

sealing oil Re-Circulating pump coupling HSNH280-43NZ

Cylinder hydraulic HTDTYG64B.0

stainless steel globe throttle check valve (welded) LJC100-1.6P

O-ring HZB253-640-03-09 part no.:39

closed circulating cooling water pump 300CS-58C

pressure hose S100-AC-AC-0030

solenoid directional valve 4WE10D31B/CW220-50N9Z5L

bladder 25L accumulator NXQ-A-25/20-F/L-Y

Oil Throw Sleeve HZB253-640-01-06 part no.:14

seal sleeve lock nut FK5G32AM-03-05

Axle pump PVH131QIC-RSF-13S-11-C25-31

key 1 115 (22*157)

Servo Valve  72-1202-10

mechanical seal 104-40

sleeve nut QG500-80-205

vickerwthrottle valve DGMFN-3-Y-A2W-B2W-41

bellows relief valve BXF-40

AST solenoid valve 4659D78001

servo valve SM4-20 (15)-57-80/40-10-S182

pressure hose SMS-15/N1/4-915mm-C

Pump, for generator stator cooling corrotion resistant centrifugal pump YCZ50-250C

sealing ring HB4-56J8-178

Electro-hydraulic servo valve J761-004

PALL pressure switch  


seals (cylinder diaphragm, packing, valve sealing gasket) 0125ZMAW16BQ13UNOERH

EH oil pump F3V10IS6SIC20

Outside collector ring