Single seat control Valve Manufacturer in China
The structure of our longz single seat control valve is compact. The flow channel adopts the S-shaped design, which can be selected according to your flow capacity and pressure requirements. Regarding the strict sealing requirements for your project, our single seat control valve is capable of providing the sealing configuration you need.
various types of Our single seat control valve
The cage type single seat control valve protects the valve body from damage caused by flash and cavitation. The valve body and fluid passage have an “S” flow line shape, resulting in low pressure drop loss, large flow rate, and a wide adjustable range. The valve core has a large guiding area and good vibration resistance.
The feed water rotary control valve regulates flow by rotating a cylindrical valve plug to alter the size of the opening formed between the plug and the valve seat.
The operation of the steam pressure-reducing valve is controlled by the pressure downstream of the valve. When the pressure sensor detects an increase in valve pressure indication The opening of the pressure-reducing valve is decreased.
The main advantages of single seat control valve
Our Longz single seat control valve features a metal valve seat that meets ASME B16.104 Class IV standards, and a soft-sealing valve seat that meets Class VI standards: This level of isolation is beyond what a double-seat valve can achieve, as once thermal expansion occurs, the two sealing lines can no longer align simultaneously. The rated adjustable ratio is 30:1, and it can reach 50:1 when using the corresponding internal components.
Your Trusted single seat control valve supplier in China
Longz has obtained ISO 9001 international quality management system certification, ISO 14001 environmental management system certification, API certification from the American Petroleum Institute, and other certificates confirming that its products meet domestic and international authoritative quality standards. The company also holds more than 50 invention patents and technology innovation patents.
The single seat control valve can be used in the petroleum industry for pressure regulation and flow control. With its sturdy structural design and precise throttling characteristics, it can adapt to complex medium conditions such as high pressure differences and prone to cavitation. It maintains stable and reliable regulating performance in processes like crude oil transportation and refining and processing.
Single-seat control valve is used in the chemical industry where the unbalanced force is small. The fluid force acting on the valve core is relatively low, so it operates more stably under high pressure differences and is less likely to vibrate. It can well adapt to process load fluctuations, thereby ensuring the smoothness and reliability of the regulation process.
In power plants, a single regulating valve, with its high precision and fast response capabilities, can operate independently without the need for an air source. Therefore, it is easy to integrate into the DCS system, enabling high-precision closed-loop regulation of the water level. This effectively ensures the stability of the water level and the accuracy of control during the operation of the unit.
- certificate
- Dimensions of single seat control valves
| DN | L | H1 | H2 | H3 | Electric actuator | Pneumatic actuator | ||||
| inch | mm | ANSI 150 PN 16/25 | ANSI 300 PN 40 | ANSI 600 PN 64/100 | ||||||
| GB/T 12221 | GB/T 17213.3 | GB/T 17213.3 | ||||||||
| 3/4 | 20 | 150 | 184 | 194 | 206 | 40 | 135 | 274 | 381LSA-20 | ZJHA/B 22 |
| 160 | 184 | 197 | 210 | 43 | 146 | |||||
| 1 1/4 | 32 | 180 | 210 | 235 | 251 | 45 | 163 | 302 | 381LSB-30 | ZJHA/B 23 |
| 200 | 222 | 235 | 251 | 56 | 163 | |||||
| 2 | 50 | 230 | 254 | 267 | 286 | 73 | 165 | |||
| 2 1/2 | 65 | 290 | 276 | 292 | 311 | 83 | 217 | 375 | 381LSB-50 | ZJHA/B 34 |
| 310 | 298 | 317 | 337 | 102 | 235 | |||||
| 4 | 100 | 350 | 352 | 368 | 394 | 110 | 236 | |||
| 5 | 125 | 400 | 402 | 425 | 500 | 146 | 340 | 465 | 381LSC-99 | ZJHA/B 45 |
| 480 | 451 | 473 | 508 | 170 | 340 | |||||
| 8 | 200 | 600 | 543 | 568 | 610 | 220 | 383 | |||
This single-seat regulating valve can precisely control key process parameters such as flow, pressure and temperature. Each parameter adjustment is highly accurate and stable, thus fully meeting our strict standards for control accuracy and fulfilling the strict requirements for precise regulation in actual working conditions.
EngineerPolish Oil CompanyThis single seat control valve features sensitive operation characteristics and rapid response capabilities, enabling it to quickly adjust the valve opening according to the control signal. Even when dealing with changes in process parameters, it can effectively enhance the control performance and stability of the system
Purchasing ManagerSaudi Chemical Company
The applicable temperature varies depending on the material. It ranges from -196℃~566℃
This single seat regulating valve is made of either V-shaped polyvinyl fluoride packing or graphite packing.
The bonnet of this single seat regulating valve is of the bolt-pressing type.
The connection type of this single-seat regulating valve includes flange type: FF, RF, RJ, TG, MFM/ and welding type: 5W (40-50mm); BW(65-200mm)
Seal gland: Check for leakage and, as needed, tighten or replace the packing.
Valve core and valve seat sealing surface: Regularly inspect for erosion, scratches and deposits.
Actuator: Check if the diaphragm is aged or damaged, if the spring is worn out, and if the air source pressure is stable.
Positioner: Calibrate the zero point and travel to confirm a reliable connection of the feedback rod.
Valve stem: Check for straightness and surface scratches. Replace the guide sleeve if necessary.