FAIRCHILD control valve 10263B (USA) available now.

Brand

FAIRCHILD/Fairchild Semiconductor (USA)

Application Areas

Chemical, Petroleum, Mining, Energy, Integrated

FAIRCHILD Control Valves

FAIRCHILD Frequency Converters

FAIRCHILD Controllers

FAIRCHILD Water Separators

FAIRCHILD Pressure Regulators

FAIRCHILD Control Valves Selection:

FAIRCHILD control valves are actuators in automated control systems, and their application quality directly reflects the system's regulation quality. As terminal components in process control, their importance is now widely recognized. Besides the product's own quality and whether the user correctly installs, uses, and maintains it, accurate calculation and selection are crucial for the successful application of control valves. Errors in calculation and selection can cause intermittent system startup and shutdown, and in some cases, even render the system unusable. Therefore, users and system designers should recognize the importance of valves in the field and must pay sufficient attention to the selection of control valves.

Principles of FAIRCHILD Control Valve Selection:

1. Select the appropriate structural form and materials based on process conditions.

2. Select the flow characteristics of the control valve based on the characteristics of the process. 3. Select the appropriate control valve diameter based on the process operating parameters.

4. Select the necessary auxiliary devices based on the process requirements.

5. Select the appropriate actuator. The response speed of the actuator should meet the process requirements.

FAIRCHILD Control Valves in the Power Industry: Types and Selection

1. Feedwater Valves: Main and auxiliary boiler feedwater valves, combined feedwater regulating valves:

Control Requirements: Control boiler feedwater to maintain boiler liquid level and steam flow.

Operating Conditions: During boiler startup, the valve differential pressure can reach 100-300 kg, with a relatively small flow rate. During normal operation, the differential pressure is small, the flow rate is large, and the flow rate adjustment ratio is 75:1-100:1.

Valve Requirements: Valve body material is WCB/WC9. For the starting valve in a dual-valve system, cavitation resistance and a Class V shut-off rating are required. For combined feedwater valves, specialized valve internals are needed to meet the requirements of both boiler startup and normal operation. 1. **Generally, the valve should be selected for fail-safe operation.** (Note that hydrazine is often added to the feedwater to remove dissolved oxygen, which can adversely affect SATELLITE 6 alloy or similar alloys. Therefore, it's best to avoid using 316 SATELLITE for internal valve components and instead use 416 stainless steel.)

2. **Boiler Feed Pump Minimum Flow Circulation Valve:**

Control Requirements: Ensures safe startup and operation of the boiler feed pump, preventing pump damage caused by insufficient flow, increased temperature rise, or severe cavitation. (Older power plants may use on/off type minimum flow control valves, as well as mechanical automatic pump circulation valves.)

Operating Conditions: Pressure drop reaches 160-350 kg, making it the valve with the greatest pressure differential in the power plant system. Flow rate is typically 30% of normal flow.

Valve Requirements: Cavitation resistant, anti-clogging structure, Class V sealing rating. The valve operates continuously during pump startup and shutdown. After normal pump startup, the valve closes, and it is typically fail-safe open.

3. High/Low Temperature Heater Feedwater Heater Drainage and Condensate Heater Drainage:

Control Requirements: Control the condensate level in the heaters and drain it promptly, i.e., high water level discharge and normal water level drain.

Operating Conditions: The medium is saturated water. The pressure difference between the control valves between heaters is generally 6-30 kg. The last-stage drain valve is directly connected to the condenser or deaerator.

Valve Requirements: Resistant to flash erosion, V or VI sealing class, the valve is usually fault-open.

4. Deaerator Level Control Valve (DALC):

Control Requirements: Provides flow to maintain the normal water level in the deaerator and eliminates dissolved gases by adding steam to raise the water temperature.

Operating Conditions: During startup, the flow rate is low and the pressure difference is high; under normal conditions, the flow rate is high and the pressure difference is low, similar to the feedwater valve.

Valve Requirements: Effectively resists cavitation at low flow rates.

5. Desuperheater Valve (Desuperheater):

Control Requirements: Injects high-pressure water into the steam to achieve the required steam temperature.

Operating conditions: Medium is water, pressure differential is large. Valve requirements: Various types: nozzle type, auxiliary atomizing type, self-contained type, and wafer type.

6. Desuperheating and pressure reducing valve (high and low pressure bypass valve):

Control requirements: Adjust high-temperature and high-pressure steam to a certain temperature and pressure; provide a bypass channel for the steam turbine, allowing the boiler to operate independently of the steam turbine.

Operating conditions: Desuperheating and pressure reducing of high-temperature and high-pressure steam.

Valve requirements: Thermal shock resistance, noise reduction, and rapid response.

FAIRCHILD control valve selection requirements for accessories:

During the production process, the control system places various special requirements on valves. Therefore, control valves must be equipped with various auxiliary devices (hereinafter referred to as accessories) to meet the needs of the production process. Control valve accessories include:

1. Valve positioner: Improves the regulating performance of the control valve and ensures accurate positioning;

2. Valve position switch: Displays the upper and lower limit travel positions of the valve;

3. Pneumatic position-holding valve: Maintains the valve at the pre-failure opening position when the air supply fails;

4. Solenoid valve: Enables electromagnetic switching of the air path, ensuring the valve is at the desired safe opening position in case of power failure;

5. Handwheel mechanism: Allows manual operation of the valve when the controller malfunctions;

6. Pneumatic relay: Accelerates the actuator's movement and reduces transmission time;

7. Air filter and pressure regulator: Purifies the air supply and regulates air pressure;

8. Air tank: Ensures that the springless cylinder piston actuator can move the control valve to a fail-safe position in case of air supply failure. Its size depends on the cylinder size, valve actuation time requirements, and valve operating conditions.

In short, the purpose of these accessories is to make the control valve's function more complete, efficient, and comprehensive. Commonly used models are as follows: 10262, 10262B, 10262BE, 10262BEH, 10262BEHSC, 10262BEJT, 10262BET, 10262BH, 10262BHSC, 10262BJ, 10262BJU, 10262BR, 10262BT, 10262BU, 10262C, 10262CB, 10262CE, 10262CET, 10262CH, 10262CJ, 10262CL, 10262CR, 10262CT, 10262CU, 10262E, 10262EH, 10262EHJ, 10262EHSC, 10262EJ, 10262EJN, 10262EJSC 10262EN 10262ENT 10262ESC 10262ET 10262H 10262HJ 10262HJN 10262HN 10262HNSC 10262HSC 10262J 10262JL 10262JN 10262JNSC 10262JNT 10262JNU 10262JSC 10262JU 10262L 10262N 10262NT 10262NU 10262NUSC 10262P 10262R 10262RH 10262RU 10262SC 10262SCU 10262T 10262TU 10262U 10262X 10263 10263B 10263BE 10263BEH 10263BEHT 10263BH 10263BHSC 10263BJ 10263BT 10263C 10263CB 10263CH 10263CJ 10263CL 10263CR 10263CT 10263CU 10263E 10263EJ 10263EJN 10263EJU 10263EN 10263EP 10263ET 10263H 10263HJN 10263HN 10263J 10263JN 10263JNU 10263JSC 10263JU 10263L 10263N 10263NP 10263NT 10263NU 10263R

Our company primarily deals with European and American brands, and can source brands from any European country. For example, our key German brands include: FESTO, BURKERT, BOSCH-REXROTH, IFM, TURCK, P+F, BALLUFF, SICK, HIRSCHMAN, MURR, HYDAC, GSR, CROUZET, E+H, PILZ, HAWE, SIEMENS, STAUFF, EUCHNER, EMG, UNIVER, ATOS, NORGREN, etc. We have cooperative relationships with approximately 500 brands of varying sizes from other European countries.

We also have companies in the US, and cooperate with approximately 200 brands, including ASCO, Vickers, MAC, Parker, Moog, Fairchild, Denison, Ross, UE, MTS, and GEFRAN.

We have agency rights for Japanese brands, such as CKD, TOYOOKI, NACHI, DAIKIN, SMC, KOGANEI, TACO, NOK, and TOKIMEC.

We also supply ATOS solenoid valves, ATOS amplifiers, ATOS solenoid directional valves, and more.