Self-operated temperature control valve defined: no external power source, and only rely on the energy of the charged fluid to its own operations and to maintain constant controlled variable valve. 
 Overview of Self-regulating valve 
 Rely on media flows through the valve's own pressure, and temperature as an energy-driven valve automatically, no external power supply and the second instrument. This self-regulating valve to the valve output feedback signal (pressure, pressure, temperature) through the tube signal is passed to the implementing agencies drive the valve to change the valve opening, to adjust the pressure, flow rate, the purpose of the temperature. This valve is divided into a direct effect and indirect role in both. 
 The direct-acting, also known as spring-loaded type, its structure is flexible, such as: the pieces of springs, bellows, the bellows-type bulb and so on, using the principle of balanced by the elastic force and the feedback signal. 
 Indirect-acting valve, the addition of a command (pilot valve) and it played the amplification of feedback signal to drive the main valve disc movement to change the valve opening and then through the implementing agencies. 
 If the pressure regulating valve, the feedback signal is the valve outlet pressure, the introduction of the implementing agencies through signal tube. 
 If the flow control valve, the valve at the exit of an orifice (or other resistance devices) out of the orifice at both ends of the differential pressure signal to the introduction of the implementing agencies. 
 If the temperature regulating valve, the valve outlet there are temperature sensors (or bulb) through the medium of thermal expansion and contraction within the temperature sensor actuator. 

 Self-operated temperature control valve to the automatic adjustment of the principle of liquid thermal expansion of liquid incompressible. Expansion of the liquid within the temperature sensor is uniform, controlling for the proportion of adjustment. Charged with a medium temperature, the sensor temperature liquid volume with the expansion or contraction. Charged with the medium temperature is higher than the set value, the temperature of liquid expansion, to promote the spool down to close the valve, reduce the heat medium flow; charged with the medium temperature below the set value, the temperature of liquid contraction, the return spring to promote the spool open, increase the flow of the heat medium. 
 Self-operated temperature control valve characteristics: (1) small size, light weight, easy to install 
 (2) accurate and reliable long life 
 Free maintenance work 
 Mediation set simple 
 Passive work (no power supply, the normal work of the gas source) 
 6. Without costly commissioning costs 
 Body seal V-shaped ring high temperature sealing components, to prevent the possibility of a tight locking stem leak. 
 Self-operated temperature control valve main technical performance indicators: 
 Nominal diameter DN (mm) 15 20 25 32 40 50 65 80 100 125 150 200 250 300 
 KV value (m3 / h) 3.2 5 8 12.5 20 32 50 80 120 180 260 350 450 500 
 The maximum allowable pressure differential pressure PN16 1.6 
 (MPa) PN 25 2.5 
 Nominal pressure (MPa) PN16 (body material for ductile iron operating temperature ≤ 220 ° C) PN 25 (body made of cast steel 
 Working temperature ≤ 350 ℃ 
 The temperature setting range (° C) 25 ° C ,35-110 ℃ 
 Balance components of stainless steel 316L waveform tube 
 Catheter length (m) 3.5-20 
 Circulation of media steam, water, hot oil 
 Self-operated control valve parameters 
 Nominal diameter DN 15 ~ 250mm 
 Nominal pressure PN1.6, 2.5,4.0,6.4 MPa 
 Flange Standard ANSI, JIS, DIN, GB, JB (special according to users) 
 Form of connection flange (FF RF RTJ) weld (SW BW), thread (1 "or less) 
 The valve cover of standard -17 ~ +450 ° C 
 Gland type bolt Clamp 
 V-shaped seal packing PTFE packing impregnated with PTFE asbestos packing, asbestos textile packing, graphite packing 

 Self-temperature regulating valve is widely used in heating, air conditioning, domestic hot water temperature to automatically adjust, as well as special occasions, the automatic temperature regulation, such as chemicals, textiles, pharmaceutical and other production engineering.