Automatic recircualtion valve-pump protection valve
Negotiable Min Order Quantity Unit
- Required Quantity
-
- Place of Origin
- China
- Brand name
- DATIAN
- Payment Terms
- L/C,Others,T/T
- Production method
- Negotiable
- Shipping / Lead Time
- Negotiable / Negotiable
- Keyword
- industrial valve, valves, pump valves
- Category
- Valves
Shanghai Datian Valve Pipe Engineering Co.,Ltd.
- Verified Certificate
-
9
Product name | Automatic recircualtion valve-pump protection valve | Certification | - |
---|---|---|---|
Category | Valves | Ingredients | - |
Keyword | industrial valve , valves , pump valves | Unit Size | - |
Brand name | DATIAN | Unit Weigh | - |
origin | China | Stock | - |
Supply type | - | HS code | 8481 |
Product Information
Automaic
Recycle Valve-Shanghai Datian Valve
1. Brand: Datian
2. Model No.:ZDT series,ZDL
series,ZDM series,BY7 series,ZHD series
3. Manufacturer: Shanghai
Datian Valve Pipe Engineering Co.,Ltd.
4. Business Terms: FOB
Shanghai-slectable terms as FOB,C&F,CIF,EXW
5. Payment: TT,L/C,Cash,Crdit
Card
More information,pls feel
free to contact with Anne He for a soonest reply!
An
automatic recirculation valve (ARC valve) is a multifunctional valve whose
primary purpose is to ensure that a pre-determined minimum flow
is assured through a
centrifugal pump at all times. This is important as centrifugal pumps suffer
from overheating and cavitation and can
be permanently damaged if
they run dry.
Through many years of research and development,continuous innovation
and practice, shanghai datian valve Co. research ZD series Automatic
recirculation control
Valve, to prevent
overheating, serious noise, unstable and erosion damage of centrifugal pump
under low load operation. As long as the flow rate of the pump valve below a
certain value, the bypass backflow mouth will automatically open to ensure
necessary minimum flow of pump.
Application on
■ Chemical industry
■ Petrochemical industry
■ Steel factory
■ Fire protection system
■ Traditional power plant
■ Shipment/shipping
■ Paper-making industry
■ Environmental protection
■
Centrifugal pumps require protection
If you use centrifugal pumps
for any liquid-boiler feed water, condensate, or process fluids, a significant
investment has been made in the pump, driver and related controls. Minimum flow
protection is vital upon pump start up and low demand conditions. If reliable
protection does not exist, the following unfavorable effects can interfere with
the performance and reliable operation of the pump.
The liquid’s temperature will
rise due to friction and hydraulic losses within the pump. Figure 2a
illustrates the temperature rise in relationship to the H-Q curve. The curve
indicates that at or near the best efficiency point,the temperature rise is minimal
and not significant to the pump operation.
The process flow removes the
generated heat from the pump. The temperature increases as the flow through the
pump is reduced.Frictional and hydraulic losses generate heat, while the
quantity of fluid to which this heat is transmitted is reduced. The rise in
temperature results in the formation of vapor. The elevated temperature / vapor
pressure of the liquid results in problems ranging from damaged seals and
bearings to complete failure of the rotating elements. Internal recirculation
within the pump, often termed incipient recirculation, can cause a form of
cavitation leading to impeller damage. Internal recirculation is illustrated in
Figures 2b and 2c.
High specific speed pumps have
power curves which rise as the flow reduces. If adequate flow is not
maintained, motor overload will
result.
Three protection ways for pump
■ Con tinuous cir cu lat ing syste m
Minimum requirement of
continuous circulating system pump is unrelated with the discharge of Process
flow changes system. After setting of minimum flow, through orifice plate
directly backflow to storage tank. Although continuous minimum flow circulation
can protect pump very good,but pump must provide greater power output to ensure
system
process flow plus recycle
flow, which causing additional energy waste.
■ Con trol circulating syste m
Control circulatory system is
assembly by the check valve, flow gauge, minimum flow control valve,control
circulation system, control circulation system can provide minimum flow
protection, when process flow is greater than minimum flow of pump, loop
closed, no extra energy loss. But system is complex,control components,
purchase, installation, maintenance cost is higher.
■ Automatic recirculation control valve
Automatic recirculation valve
set check valve, flow perception, bypass control valve, multi-stage step-down
in one, do not need power, control system and wiring, essential safety. Taking
up small space,reducing the possibility of high-speed fluid to malfunction to
minimum, with lower Installation and maintenance cost,It is the priority pump
protection way of modern industrial process.
ZD series Automatic
recirculation control valve
ZDT Model
■ Simple structure, low cost, long life, suitable for Low pressure
Working conditions.
■ Cast valve body, material: carbon steel or stainless steel etc.
■ Big flow of bypass, maximum flow is 60% of main flow, KV value
can be adjusted.
■ Bypass maximum operating pressure differential up to 4 MPa.
■ Pressure CL150# - 400#, size1’’ - 16’’.
ZDL Model
■ Multi-orifice cage bypass, low noise, suitable for middle and
low pressure conditions.
■ Forged steel body, material: carbon steel or Stainless steel etc.
■ Non-return valve function is standard, Maximum pressure
differential up to 6 MPa.
■ With venturi port main flow check valve structure, be applicable
for complicated working
conditions.
■ Pressure CL150# - 600#, size1’’ - 20’’.
■ Manual bypass operation is optional.
ZDM Model
■ Multistage decompression to preventing cavitation,reducing
velocity, suitable for high
pressure conditions.
■ Forged steel body, material: carbon steel or Stainless steel etc.
■ Non-return valve function is standard, Maximum pressure
differential up to 30 MPa.
■ Pressure CL150# - 2500#, size1’’ - 20’’.
B2B Trade
Price (FOB) | Negotiable | transportation | - |
---|---|---|---|
MOQ | Negotiable | Leadtime | Negotiable |
Payment Options | L/C,Others,T/T | Shipping time | Negotiable |
- President
- Yu chengshan
- Address
- No.3223,Zhouzhu Road,Pudong district,Shanghai,201323
- Product Category
- Other General Industrial Equipment,Valves
- Year Established
- 1998
- No. of Total Employees
- 101-500
- Company introduction
-
Shanghai Datian Valve Pipe Engineering Co., Ltd, was set up in 1998. For more than 20 years, DATIAN has been the recognized pioneer and leading provider of high quality Valves. Incorporating advanced flow control technologies, DATIAN's best of breed solutions have proven themselves in every level of the irrigation, water works and fire protection industries. Today, DATIAN's tailor-made solutions help global customers meet the challenges of the 21st century, delivering superior performance over a long service life at the most competitive price.
DATIAN Valve is one of the most professional manufacturers of ball valves in China. And we also offer control valve,automatic recirculation valve,gate valves, globe valves, check valves, bellows valves, butterfly Valves... Our valves are supplied for a broad range of applications in various industries such as power generation, chemical, petrochemical, oil, gas, pulp, paper, mining, cryogenic and ship building...
DATIAN Valves strives to maintain the following ethics:
Technically qualified personnel delivering the relevant technical expertise and solutions.
Sufficient stock levels in order to provide immediate standard order completion.
Competitive pricing on all equipment .
All round professionalism and integrity from all staff members
DATIAN Valves has passed CE, API, ISO,API certificates. All products supplied by the company are manufactured to the required standards. So for more information on the types of valves we supply, please do not hesitate to contact us by calling, or E-mail us. We look forward to hearing from you.
- Main Markets
-
Canada
China
India
Indonesia
Kazakhstan
Nigeria
Pakistan
U. Kingdom
U.S.A
Zimbabwe
- Main Product
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