The ZJ-20-T6 steam turbine bolt heater utilizes a dual design approach of "precise power matching + intelligent temperature rise control," breaking the efficiency bottleneck of traditional heating methods and significantly reducing bolt tightening time. The core of this power design is to calculate the optimal heating power for each bolt based on the bolt's material properties, nominal dimensions, and thermal tightening requirements. This avoids slow temperature rise due to insufficient power or localized overheating due to excessive power. The heater's heating element is made of a high-density alloy, and the length of the heating section is precisely matched to the depth of the bolt's heating hole. This ensures direct heat transfer to the bolt's core stress-bearing area, minimizing heat loss to the external environment and significantly improving heat utilization efficiency.

 

The temperature rise control mechanism utilizes a "staged heating + real-time temperature feedback" mechanism: Initially, the temperature is rapidly increased at a higher power level. When the bolt temperature approaches the thermal tightening threshold, the heater automatically switches to a holding power level. A built-in temperature sensor monitors the bolt temperature in real time to prevent thermal stress caused by temperature fluctuations. Traditional heating methods rely on manual intermittent heating and temperature measurement, which can easily lead to repeated temperature increases due to inaccurate temperature control, and tightening a single bolt can take several hours. The ZJ-20-T6, however, precisely coordinates power and temperature rise to uniformly reach the tightening temperature within tens of minutes. The heating process requires no manual intervention, and multiple bolts can be heated simultaneously. This design directly shortens the time required for bolt removal and installation, a critical step in steam turbine maintenance. Especially for units requiring extensive bolt tightening, overall maintenance time can be reduced by over 30%, minimizing unplanned downtime losses.

 

As a comprehensive enterprise integrating R&D, manufacturing and sales, YOYIK always adheres to the "customer-centric" business philosophy and is committed to providing one-stop equipment procurement and technical services. The company has an experienced technical team and a complete after-sales service system, which can quickly solve various problems of customers in the process of equipment installation, commissioning and maintenance, and ensure the smooth progress of customer projects. Whether it is large-scale power station construction or small-scale equipment transformation, YOYIK is a trustworthy partner.

 

Yoyik can offer many spare parts for power plants as below:

 

Electric heating rod ZJ-20-T6

Position indicator 6DR5010-ONGOD-OAAO\SW400.00

Excitation Regulator Power Supply Module 4NIC-FD480

Braun Card D42151U1

PRINTED POWER SUPPLY CARD CIRCUIT BOARD GD4421007

MAIN CARD FOR ELECTRIC ACTUATOR RJ 80

microtemp thermal fuse XRNT-12-100A

ALARM SIRINE - WARN ING HORN TGSG-06C

Eddy Current Sensor PR6423/002-040

LVDT transmitter XCBSQ-02/500-02-02

LVDT Sensor 2000TDGN-15-01

Probe TDZ-1-33

M8410 Input Source Board ME8.530.031

Eddy Current Sensor PR6422/000-101

Sensor DF311180-50-02-02

240v pressure switch RC778NZ090HSS

LVDT Sensor Z96200WN

Potential Transformer ZDG-1.5

Electric heating rod ZJ-20-T6

LVDT Sensor HBTD-6-250

automatic temperature WSSX-411 0-100℃ L=75MM M27*2

Oil and water alarm OWK-II

Eddy Current Sensor PR6424/004-100

Local operation box HSDS-40/LC

Rotation Speed Sensor DF6202

Eddy Current Sensor PR6423/003-111

Temperature and humidity controller TH-D/OLED

Sensor speed turbine SZCB-01

Temp sensor AS5181PD50Z2

FRP TQJ-2400AT9

Excitation power supply module MPS10/5-230/24/48

LVDT Sensor 4000TDGN-100-01-01

Pressure relief valve YSF16-70/130KKJ

displacement sensor potentiometer TDZ-1G-11

Shaft Displacement Protecting Unit CWY-DO-20Q08-50V

LEVEL SWITCH LOW RC861CZ084HYR

Relay for distribution network RMDH-88H

GES6000 excitation system supporting display screen GES6000

Electric heating rod ZJ-20-T6

 

Speed Transmitter Sensor ZS-02

eddy current sensor is used for CON011/916-100

Power supply PSMB-8-8-24V/120W

Transformer TBS-200 (84)

led rpm indicator SCZ-04B

Current sampler WBV334aS1-0.5

motor differential protection relay WDZ-5231

ACTUATOR RJ80

Actuator LVDT Position Sensor DET-500A

Human Interface Module 20-HIM-A6

module 3500/40-01-00

Eddy Current Sensor PR6422/003-010

Electric actuator control board 2SA77HN-D2TO-HY-MN

Auxiliary power PSMU-1-12V/10W

Two-wire LVDT Sensor HDC2-150-01-10

Bolt electric heating rod ZJ-20-T8

Speed transmitter T501.50

hydrogen transmitter KQL1500

bolt heater DJ-22-41

sensor T-O3S

Plasma cathode head EPBS-G-II-175-YJ/XL

mechanical fuel tank level gauge UHZ-10C00N1000 S1. 00DN2525PN1.6V

Flame detection optical fiber LK-YD-S-122

Eddy Current Sensor PR6424/002-001

Embedded intermediate relay GZY-202/110V

eddy current transducer CWY-DO810800-50-0301-01

Flow Switch 619353-SGLGY7

RTD WZPK2-238

differential pressure indicator MIX7B62B24

LVDT transmitter XCBSQ-03/25-01-22

DC electric heating cabinet DJZ-02

Indicator RDZW-2Na04-B02-C01-F01

precision level gauge CEL-3581A/GF

lvdt measurement HL-3-300-15

Current shunt resistror FL2-75mV

speed sensor CS-1D 065-02-01

Steam turbine bolt electric heating rod 05E14A

Electric heating rod ZJ-20-T6

 

DFYLMY-2025-10-10-A