ZDT automatic circulation pump protection valve
- sell:021-32051999
- sell:021-32050777
- fax:021-66099555
Details
- Product Introduction
- Service Promise
- Ordering Process
ZDT automatic circulating pump protection valve ZDT automatic recirculating pump protection valve is a pump protection device. It automatically protects the centrifugal pump (especially the transmission of hot water medium) at low load operation may occur in the pump body part of cavitation damage and instability. Once the pump flow below the preset flow, bypass fully open to ensure that the minimum pump needs. Flow rate. Even if the main road is completely closed, i.e. the flow rate of the main road is zero, the minimum flow rate can be automatically circulated through the bypass. Pressure is lowered through the integrated multistage throttle pressure reducing valve in the bypass.
ZDT automatic recirculation valve has a larger diameter bypass, this valve is used for larger bypass flow, pressure difference up to 4MPa.
Working principle
At the same time, the main disc drives the bypass stem and transfers the action of the main disc to the bypass. By controlling the position of the bypass disc, the throttle area of the bypass can be changed to control the bypass flow. When the main disc returns to the valve, the bypass flow can be controlled. When the seat is closed, all flow flows back through the bypass. When the main disc rises to the top position, the bypass is completely closed, and all the flow of the pump flows to the throttle system.
The valve has four functions:
1. Flow perception: The main valve disc of the automatic recirculation valve can automatically perceive the main flow in the process system, so as to determine the position of the main disc and the bypass disc according to the flow.
2. Recirculation Control: Automatic Recirculation Valve can suck the minimum flow required for normal operation of the pump into the storage device by-pass, adjust the H-Q characteristics of the pump to achieve recirculation.
3. Bypass multistage decompression: Bypass control system can reduce the high pressure of reflux medium from pump outlet to low pressure suitable for reflux storage device with low noise and wear.
4. Check: Automatic recirculation valve also has the function of check valve to prevent liquid from flowing back into pump body. ZDT bypass check is optional.
Characteristic
Simple structure, reliable and stable operation, only a small number of moving parts.
It is easy to install and can be installed vertically or horizontally at the pressure outlet of the pump.
Bypass flow is large, maximum to 60% of main flow, and KV value can be adjusted.
Bypass maximum working pressure difference to 4MPa (optional bypass check function).
It can be applied to other liquid media such as water, oil and methanol. The working temperature ranges from -196 to +300 C.
Material of main parts
No | name | Material (common) | No | name | Material (common) | ||
1 | Valve body | WCB | CF8 | 11 | O-ring | EPDM | EPDM |
2 | Recirculation valve flap | 2Cr13 | 304 | 12 | Stud | 45 | 0Cr18Ni9 |
3 | Recirculation valve seat | 2Cr13 | 304 | 13 | Hex nuts | 35 | 0Cr18Ni9 |
4 | Threaded sleeve | 2Cr13 | 304 | 14 | cap | WCB | CF8 |
5 | O-ring | EPDM | EPDM | 15 | Guide block | 2Cr13 | 304 |
6 | Main valve flap | 2Cr13+STL | 304+STL | 16* | bushing | 2Cr13 | 304 |
7 | O-ring | EPDM | EPDM | 17* | Porous sleeve | 2Cr13 | 304 |
8 | pad | 2Cr13 | 304 | 18* | End ring | 2Cr13 | 304 |
9 | Hex nuts | 304 | 304 | 19* | spring2 | 60Si2Mn | 1Cr18Ni9Ti |
10 | spring | 60Si2Mn | 1Cr18Ni9Ti | 20* | Compression nut | 2Cr13 | 304 |
* parts needed for bypass check function.
performance parameter
Valve specificationmm | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
Maximum main flowm3/h | 12 | 28 | 30 | 50 | 100 | 114 | 200 | 400 | 455 | 750 | 1250 | 1650 |
bypasssizemm | 15 | 20 | 20 | 25 | 40 | 40 | 50 | 80 | 80 | 100 | 100 | 150 |
Maximum bypass flow coefficient Cv | 2.3 | 4.6 | 4.6 | 6.9 | 18.5 | 18.5 | 34.7 | 69.3 | 69.3 | 116 | 116 | 170 |
Note: The main inlet and outlet size of the valve depends on the pump outlet.size. |
Valve specification | sizemm | bypass | weightKg | |||
DN(mm) | S | H | L | (DNB) | PN10/16/25 | PN40/64 |
25 | 115 | 102 | 267 | 15 | 12 | 18 |
32 | 115 | 102 | 267 | 20 | 14 | 20 |
40 | 115 | 102 | 267 | 20 | 14 | 20 |
50 | 130 | 108 | 305 | 25 | 22 | 26 |
65 | 165 | 127 | 381 | 40 | 46 | 51 |
80 | 181 | 127 | 381 | 40 | 46 | 51 |
100 | 209 | 159 | 495 | 50 | 105 | 118 |
125 | 267 | 220 | 575 | 80 | 143 | 156 |
150 | 267 | 220 | 575 | 80 | 220 | 240 |
200 | 300 | 220 | 600 | 100 | 255 | 302 |
250 | 356 | 305 | 780 | 100 | 400 | 455 |
300 | 530 | 280 | 830 | 150 | 590 | 650 |
The best quality, first-class service Qigao creates more value for you!
"Qigao Valve" expects to continuously improve service quality and strive for excellence. "Sincere service" is the eternal theme of "Qigao". "Qigao" strictly followsIS09001-2000 Quality system certification requirements, strict quality control, responsibility to people, to ensure the healthy operation of production, sales and service. Strengthen communication with users and provide quality products to our customers with perfection and perfect service. Hereby our factory makes the following commitments:
Product Standards:
Products in strict accordance with ChinaGB、HG Standard and USAPISuch as standard design, manufacturing, acceptance. The hardness of the sealing surface meets the requirements of the state and the width exceeds the national standard.
pre-sale service:
Product introduction, technical exchange, non-standard product design, troubleshooting。
Sale service:
A trustworthy contract guarantees timely delivery and keeps in touch with customers. For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.
After sales service:
1、"Qigao" brand product quality period is from the factory12In the month, the implementation of the "three guarantees" service (return, replacement, warranty).
2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions, so as to further improve product quality.
3、Respond quickly to the quality of user complaints, after-sales service personnel rushed to the scene in 24-36 hours (48 hours outside the province).
4、For after-sales service, users are required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of Qigao.
1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.:
a、Structure length;
b、Connection Type;
c、Nominal diameter, full diameter, reduced diameter, pipe size;
d、Operating medium and temperature, pressure range;
e、Tests, inspection standards and other requirements
2、The factory can configure various types of driving devices according to customer's specific requirements.。
3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.
4、For futures and order customers, please call us in advance to tell the required valve model, specification, quantity, delivery time and location, and timely transfer to the factory account according to the total 30% deposit or full payment. The rest of the payment is pending. Import before shipment to arrange delivery in time.
Order Process:
1、Customer purchase list fax to021-33872143,Or call us 021-33872141
2、Receive customer purchase list, provide valve model selection and quotation (price list)。
3、Specific agreement: delivery date, special requirements, etc.。
download Google:
1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.:
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2、The factory can configure various types of driving devices according to customer's specific requirements.。
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3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.
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4、For futures and order customers, please call us first to tell the required valve model, specifications, quantity, delivery time and location, and press the total30%The deposit or full payment will be remitted to our factory account in time., The rest of the payment will be remitted before shipment to arrange delivery in time.。
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Sale service:
Trustworthy contract, guarantee timely delivery, keep in touch with customers at any time。
For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.
After sales service:
1、"Qigao" product quality period is from the factory12Month, practice“Three packs”Service (return, replacement, warranty)。
2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions.,
In order to further improve product quality。
3、Respond quickly to the quality of user complaints, after-sales service personnel24-36Hours (outside the province48Hour) rushed to the scene。
4、For after-sales service, the user is required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of “Qigao”.。
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