Function: Reducing
Size: From 1/2’’ up to 2”
Body material: Carbon steel, Stainless steel, and Exotic materials
Trim materials: Stainless steel (std.) and Exotic materials
Diaphragms: Polychloroprene, PTFE, FKM, Stainless steel, others
End connections: Threaded and Flanged
Max rating: ANSI 1500
Cv Range: From 0.033 up to 12.8
Function: Reducing and Relief
Size: From 1/2’’ up to 2”
Body material: Carbon steel, Stainless steel
Diaphragms: NBR
End connections: Threaded and Flanged
Max rating: ANSI 1500
Cv Range: From 0.04 up to 4.9
Function: Reducing, Relief, and Backpressure
Size: From 1’’ up to10” standard Special design for 20’’
Body material: Carbon steel, Stainless steel, and Exotic materials
Diaphragms: Polychloroprene, PTFE, FKM, Stainless steel, others
End connections: Flanged
Max rating: ANSI 1500
Cv Range: From 6 up to 850
A self-operated control valve, also known as a self operated pressure control valve or self operated temperature control valve, is an auto control valve that relies on the pressure and temperature of the medium flowing through the valve as an energy source to drive the self operated control valve to work automatically and does not require an external power supply and secondary instrumentation. Contact our china valves manufacturers for more information on self actuated valve!
A self-actuated pressure control valve is a type of control valve that regulates the pressure of a fluid in a system without the need for an external power source or control signal. It operates on the principle of pressure balance.
The valve has a diaphragm or a piston that separates the process fluid from a reference pressure fluid. The reference pressure fluid is typically supplied from a source that is independent of the process fluid, such as a compressed gas or a spring-loaded pressure vessel.
When the process fluid pressure rises above the set-point of the valve, the diaphragm or piston is pushed upward, which in turn restricts the flow of process fluid through the valve. This causes the process fluid pressure to decrease until it reaches the set-point of the valve. At this point, the diaphragm or piston moves back down, allowing the process fluid to flow through the valve again.
The set-point of the valve is typically adjustable and can be changed by adjusting the tension of the spring or the pressure of the reference fluid.
Self-actuated pressure control valves are commonly used in different kinds of application of control valve in industry to maintain a constant pressure in a process line or to protect equipment from overpressure. They are simple, reliable, and require minimal maintenance.
Body Sizes and Face to Face Dimensions
| Size | Flanged | Threaded | ||||
| PN16 | NPT-F | |||||
| PN25 | ||||||
| PN40 | GAS-F Con | |||||
| ANSI 150RF | BSP-F | |||||
| ANSI 300RF | ||||||
| ANSI 600RF | ||||||
| A | B | C | A | B | C | |
| 1/2"(DN15) | 285mm | 80mm | 115mm | 130mm | 80mm | 115mm |
| 3/4"(DN20) | ||||||
| 1"(DN25) | ||||||
| 1 1/2"(DN40) | ||||||
| 2"(DN50) | N/A | N/A | N/A | |||
Sectional Drawing of R640 Series
Body Sizes and Face to Face Dimensions
| Size(DN) | Threaded | ||||
| NPT-F BSP-F | |||||
| A | B | C | ØD | E | |
| 1/2’’ DN15 | 305mm | 89mm | 345.5mm | 250mm | 122mm |
| 3/4’’ DN20 | |||||
| 1’’ DN25 | |||||
| 1 1/2’’ DN40 | |||||
Energy Efficiency: They do not require external power sources, reducing energy consumption.
Simplicity: With fewer components, they are easier to install and maintain.
Reliability: Their design reduces the risk of failures and increases system reliability.
Cost-Effectiveness: Lower operational and maintenance costs compared to electrically or pneumatically operated valves.
Self-operated control valves are used in various industries, including:
Oil and Gas: For pressure and flow regulation in pipelines and processing plants.
Chemical: To maintain precise control of chemical processes.
Water Treatment: For controlling water flow and pressure in treatment facilities.
HVAC: In heating, ventilation, and air conditioning systems to regulate temperature and flow.
