Working Principle
Self operated temperature regulating valves can be classified according to their functional form; Heating with temperature control type. Temperature controlled cooling type. Confluence (diversion) temperature regulating type. It is regulated based on the principle of thermal expansion, contraction when cooled, and incompressibility of the liquid. Insert the temperature sensor into the medium that needs to be controlled for temperature. When the temperature of the medium increases, the temperature sensing liquid expands, and the force overcomes the resistance of the spring, pushing the valve core to move downward. The valve tends to close, thereby reducing the flow rate of the heat medium; On the contrary, when the temperature of the medium is lower than the set temperature, the temperature sensing liquid contracts, and the reset spring pushes the valve core to open, increasing the flow rate of the heat medium and causing the temperature of the controlled medium to tend to rise. Repeating in a loop to maintain the temperature value of the controlled medium within the allowable range of the set temperature.
Product Features
This valve does not require external energy such as electricity or compressed air, making it safe and reliable. The temperature sensing liquid expands uniformly, with proportional adjustment control, high control accuracy, stable operation, and effective energy saving. The balanced valve body design enables the valve to work under larger pressure differentials, with linear or equal flow characteristics. The temperature setting operation is simple and convenient, with small size, light weight, and easy installation.
Material for Main Parts
| Material code | C(WCB) | P(304) | R(316) | |
|---|---|---|---|---|
| Main parts | Valve body, valve cover | WCB(ZG230-450) | ZG1Cr18Ni9Ti(304) | ZG1Cr18Ni12Mo2Ti(316) |
| Valve core, valve seat | 1Cr18Ni9Ti(304) | 1Cr18Ni9Ti(304) | 1Cr18Ni12Mo2Ti(316) | |
| Valve stem | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | |
| Bellows sleeve | 1Cr18Ni9Ti,1Cr18Ni12Mo2Ti | |||
| Balanced corrugated pipe | 1Cr18Ni9Ti | |||
| Warm package | H62,1Cr18Ni9Ti | |||
| Capillary | H62,1Cr18Ni9Ti | |||
| Joint | H62,1Cr18Ni9Ti | |||
Main Technical Parameters
| Nominal Diameter (mm) | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Rated Flow Coefficient Kv |
Single Seat | 5 | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | |
| Double Seat | 12 | 22 | 33 | 53 | 83 | 132 | 209 | 330 | 528 | 836 | ||||
| Sleeve | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | ||||
| Rated Stroke L (mm) | 6 | 8 | 10 | 14 | 20 | 35 | ||||||||
| Allowable Maximum Pressure Difference (MPa) | 1.6 | 1.5 | 0.5 | |||||||||||
| Temperature Regulation Range (℃) | 0 - 70, 50 - 120, 100 - 170, 150 - 220, 200 - 270 | |||||||||||||
| Regulation Accuracy (%) | ±5 | |||||||||||||
| Allowable Overload Value (℃) | Add 50 to the upper limit of the above temperature regulation range respectively | |||||||||||||
| Operating Environment Temperature (℃) | -40 ～ +80 | |||||||||||||
| Installation Joint | G1" | |||||||||||||
| Capillary Length (m) | 3, 5, 8 | |||||||||||||
| Allowable Leakage | Hard Seal (L/h) | Single Seat ≤ 10-4 × Valve Rated Capacity (Class IV); Double Seat, Sleeve ≤ 5 × 10-3 Valve Rated Capacity (Class II); | ||||||||||||
| Soft Seal (ml/min) | 0.15 | 0.15 | 0.15 | 0.30 | 0.30 | 0.45 | 0.60 | 0.90 | 1.70 | 4.0 | 4.0 | 6.75 | ||
Main Dimensions and Connection Dimensions: (PN1.6MPa)
| Nominal Diameter DN (mm) | L (mm) | D (mm) | L1 (mm) | H (mm) | G (mm) | Conduit Length (m) | D (mm) | D1 (mm) | Bolt Holes (n-Ф) |
|---|---|---|---|---|---|---|---|---|---|
| 32 | 180 | 25 | 430 | 380 | 1-1/4" | 3 | 135 | 100 | 4-18 |
| 40 | 200 | 25 | 430 | 410 | 1-1/4" | 3 | 145 | 110 | 4-18 |
| 50 | 230 | 25 | 430 | 450 | 1-1/4" | 3 | 160 | 125 | 4-18 |
| 65 | 290 | 25 | 430 | 490 | 1-1/4" | 3 | 180 | 145 | 4-18 |
| 80 | 310 | 25 | 430 | 530 | 1-1/4" | 3 | 195 | 160 | 8-18 |
| 100 | 350 | 25 | 430 | 560 | 1-1/4" | 3 | 215 | 180 | 8-18 |
| 125 | 395 | 25 | 550 | 600 | 1-1/4" | 4 | 245 | 210 | 8-18 |
| 150 | 470 | 25 | 550 | 640 | 1-1/4" | 4 | 280 | 240 | 8-23 |
| 200 | 600 | 25 | 550 | 690 | 1-1/4" | 4 | 335 | 295 | 12-23 |
| Note: If users need products with a nominal pressure of PN2.5MPa or nominal diameters of DN15, DN20, DN25, please inquire with our company for the dimensions. | |||||||||
(1) Before installation, check that the product model, tag number, and specifications match the requirements. Inspect the entire valve for missing or loose parts.
(2) Prior to installation, clean the pipeline. Ensure there is sufficient straight pipe section at the valve inlet and install a filter. When connecting the valve body to the pipeline flanges, ensure coaxiality.
(3) Thoroughly clean the pipeline before installing the valve.
(4) The installation site should ensure the safety of personnel and equipment, facilitating operation, disassembly, and maintenance.
(5) The valve should be installed vertically upright on horizontal pipelines. If necessary, it can be installed at an angle, but horizontal installation should be avoided. For occasions with heavy valve weight or vibration, use a support frame.
(6) The medium flow direction must align with the arrow on the valve body. The air supply should be dry and oil-free. The valve should be used in environments with temperatures ranging from -20℃ to 55℃.
(1) Cleaning the Valve: For general media, cleaning with water is sufficient. For media harmful to health, first understand their properties and then select an appropriate cleaning method.
(2) Disassembly: Remove rust from exposed rusted parts first. Before derusting, protect the machined surfaces of precision parts such as the valve seat, valve plug, valve stem, and push rod. Use special tools when disassembling the valve seat.
(3) Valve Seat: Minor rust or wear on the sealing surface can be repaired by machining. If damage is severe, replace the seat. However, both repaired and replaced hard sealing surfaces must be lapped.
(4) Valve Stem: If the surface is damaged, it must be replaced.
(5) Damage to Push Rod, Guide, and Sealing Surfaces: Reverse-acting actuators must be replaced; direct-acting actuators can be reused after proper repair.
(6) Compression Spring: If there are cracks or other defects affecting strength, replace it immediately.
(7) Wear Parts: Packing, gaskets, and O-rings must be replaced entirely during each maintenance. Check the valve plug and diaphragm for cracks, aging, or corrosion that may cause future failures. Decide whether to replace them based on inspection results, but the diaphragm service life should not exceed 2-3 years.
(8) When reassembling the valve, ensure alignment. Tighten bolts diagonally and lubricate sliding parts. After reassembly, debug the valve according to the factory test items and methods. During this period, accurately adjust the packing compression force and the valve plug closing position.
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If the model has not been selected before ordering, please provide us with the operating parameters:
(1) Nominal diameter DN (mm);
(2) Nominal pressure (MPa or bar);
(3) Fluid properties (including medium temperature, viscosity, or acidity/alkalinity);
(4) Pressure before and after the valve (pressure differential);
(5) Requirements for flow characteristics;
(6) Materials of valve body and valve core;
(7) Connection type;
(8) Driving method (provide air supply pressure, driving voltage);
(9) Supporting accessories (for pneumatic valves, it is recommended that users install an air filter triplet and a 2-position 5-way solenoid valve);
(10) On-site working conditions. -
If the product model of our company has been selected by the design unit, please order directly from our production department according to the model;
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When the application occasion is very important or the pipeline is relatively complex, please provide the design drawings and detailed parameters as much as possible, and our experts will review and check them for you.
