ZZW type self operated temperature regulating valve is an energy-saving product that relies on the temperature changes of the regulated medium to automatically regulate without the need for external energy
ZZW type self operated temperature regulating valve is an energy-saving product that relies on the temperature changes of the regulated medium to automatically regulate without the need for external energy. The product types include ZZWP single seat self operated temperature regulating valve, ZZWM type sleeve self operated temperature regulating valve, and ZZWN type double seat self operated temperature regulating valve. The mode of action includes heating type (type B, when the temperature of the measured medium increases, the temperature valve closes) and cooling type (type K, when the temperature of the measured medium increases, the temperature valve opens).□ Product Features
1. No external energy is required, and automatic regulation is achieved by utilizing the temperature changes of the controlled medium itself.
2. It has a wide temperature setting range and is easy to adjust.
3. There is a pressure fluctuation compensation device for measuring and controlling the medium, which can improve the control accuracy.
4. The controller has proportional adjustment characteristics, smooth operation, and no noise.
5. There is an over temperature and overload protection device with high reliability.
Therefore, this series of products is widely used in various mechanical and electrical equipment such as heating, water supply, air conditioning, boilers, bubble hood furnaces, and various heat exchangers. Realize automatic adjustment of temperature difference. It can also be used for on-site adjustment in continuous production processes such as chemical, petroleum, power, metallurgy, etc., which can save energy and equipment investment, reduce maintenance and workload.
Working principle
Taking ZZWP-16B valve as an example:
The ZZW type self operated temperature regulating valve works based on the principle of liquid volume expansion when heated. The temperature detection element is inserted into the measured medium, and when the temperature rises, the volume of working fluid in the temperature chamber increases sharply, causing the pressure in the sealed chamber to increase. This compresses the bellows and moves the pushing spring downwards, thereby pushing the valve stem and valve core to move towards the valve seat direction, closing the valve and making the temperature of the measured medium approach the set value. The valve core stays in a new position, that is, the displacement of the valve core is proportional to the change in temperature of the measured medium, forming a certain proportional adjustment characteristic.
□ Main technical parameters
| Nominal diameter DN (mm) |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
| Nominal pressure PN (Mpa) |
1.6 4.0 |
rated flow
Coefficient Kv |
Single seat |
3 |
5 |
8 |
12.5 |
20 |
32 |
50 |
80 |
125 |
160 |
320 |
450 |
| two-seater |
|
|
10 |
15 |
35 |
35 |
60 |
100 |
150 |
176 |
400 |
500 |
| sleeve |
|
|
8 |
12.5 |
20 |
32 |
50 |
80 |
125 |
160 |
320 |
450 |
| Rated stroke (mm) |
8 |
6 |
10 |
14 |
20 |
35 |
| Allow maximum pressure difference Mpa) |
1.6 |
1.5 |
0.5 |
| Temperature regulation range (℃) |
0-70, 50-120, 100-170, 150-220, 200-270 |
| Adjustment accuracy (%) |
±10 |
| Allowable overload value (℃) |
Add 50 to the upper limit of the temperature adjustment range mentioned above |
| Operating environment temperature (℃) |
-40～+80 |
| Install connector |
G1″ |
| Capillary length (M) |
3. 5 |
| Warm pack material |
Brass H62, 1Cr18Ni9Ti |
| Valve body material |
WCB、 CF8、 CF8M |
| Valve core material |
1 CR 18 by 9 Ti 、 0 CR 17 of 12 mo 2 Ti |
| Allowable leakage amount |
Double seat, sleeve: 5 × 10-3Rated capacity of valve (Class II)
Single seat: 10-4Rated capacity of X valve (Grade IV) Soft seal Grade VI |
□ Installation and use
1. The use of temperature valves
(1) The temperature valve should be installed and used according to the specified working conditions. When installing the valve, it should be installed vertically and the inlet and outlet directions of the valve should be aligned with the flow direction of the medium.
(2) The installation location should be chosen in places with minimal impact and vibration as much as possible.
(3) The length of the temperature sensing package immersed in the measured medium shall not be less than 4/5 of the length of the temperature sensing package.
(4) The minimum bending radius of the capillary tube is not less than 75mm.
(5) The temperature sensor should be installed horizontally or diagonally upwards (see figure on the right)
2. The use of temperature valves
(1) The temperature valve has been debugged according to the user's requirements when it leaves the factory, and can be installed and operated after the goods arrive. If there is a significant difference between the controlled temperature and the set temperature, the temperature can be adjusted by adjusting the spring.
(2) When stopping work for a long time, please close the shut-off valve in front of the valve. This can extend the service life of the valve and avoid wasting steam (or high-temperature water) due to leakage.
□ Overall dimensions
| Nominal diameter DN |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
| Distance from flange end face L |
150 |
160 |
180 |
200 |
230 |
290 |
310 |
350 |
400 |
480 |
| Total height H |
500 |
540 |
580 |
640 |
700 |
750 |
820 |
950 |
| Temperature pack insertion depth T |
235 430 |
430 630 |
| Exposed height of temperature package h |
350 |
| Warm package diameter d |
25 (diameter of sheath is 28) |
| Weight Kg |
16 |
18 |
21 |
23 |
25 |
52 |
62 |
75 |
105 |
145 |
□ Application examples
Taking steam or high-temperature water as an example, steam or high-temperature water is heated to the required temperature by a heater through a temperature valve. Stop valves are installed before and after the temperature valve to cut off the steam (or high-temperature water) flowing through the regulating valve when maintenance or heating is stopped. The bypass is used as a backup in case of valve failure or maintenance, and is closed during normal operation. The temperature sensor is installed at the outlet of the hot water.
□ Connection size and standard
·Flanges according to GB/T9113-2000 (default standard)
You can also follow JB/T79.1-94, JB/T79.2-94, or HG20592-HG20635-2009
·Flange sealing surface type: PN16, PN25 are convex flanges
PN40 and PN64 (63) are concave convex flanges, and the valve body is a concave convex flange
·The distance between flange end faces shall be in accordance with GB12221-2005 (other standards must specify)
·Execution mechanism signal interface: Internal thread M16 × 1.5
·The distance between the valve body flange and the flange end face can be manufactured according to the user's standards, such as ANSI, JIS, DIN, etc
□ Ordering Notice
Please provide the following information when placing an order:
·Name and model of regulating valve
·Nominal diameter (mm), nominal pressure (Mpa), set temperature (℃) and range
·Capillary length (generally not exceeding 3m) (please specify special requirements)
·Pre valve pressure, post valve pressure
·Media name and status
·Material requirements for valve body and internal components
·Valve body flange standard (if not specified, our company will supply according to GB9113-2000 regulations)
·Valve body structure length (flange distance L) (if not specified, our company will supply according to GB12221-2005 regulations)
·Other special requirements
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