Performance characteristics of self-operated differential pressure regulating valve and flow selection of fire pump and sewage pump
Feb 07, 2023
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1. Overview of self-operated differential pressure regulating valve:
ZYF-16 self-operated differential pressure control valve does not require external energy, and relies on the pressure change of the medium to be regulated for automatic adjustment, automatically eliminates the remaining pressure head of the pipe network and the flow change caused by pressure fluctuations, and keeps the user's inlet and outlet pressure differences constant. Helps stabilize system operation. Especially suitable for household metering or automatic control system.
2. Performance characteristics of self-operated differential pressure regulating valve:
The differential pressure valve is a double disc structure with small unbalanced force of the valve stem and compact structure. It is used in the heating (air conditioning) water system to keep the pressure difference of the controlled system constant, and has the following characteristics:
1. Constant pressure difference of the controlled system;
2. Support the internal self-regulation of the controlled system;
3. Absorb the pressure difference fluctuation of the external network;
4. The advanced stepless pressure regulation structure is adopted, and the control pressure difference can be adjusted up to 25:1;
5. It has the function of automatically eliminating blockage;
6. The flange size conforms to GB4216.2 medium gray cast iron flange size.
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The drainage pumps used in buildings include submersible sewage pumps, submerged sewage pumps, vertical sewage pumps and horizontal sewage pumps. Due to the generally small site in the building and the small displacement, submersible sewage pumps and submerged sewage pumps can be preferred for drainage pumps. Among them, submerged sewage pumps are generally used in important places; vertical sewage pumps and horizontal sewage pumps require isolation. Seismic foundation, self-irrigating water absorption, and occupying a certain amount of space, so it is rarely used in buildings.
The flow rate of fire pumps and sewage pumps should be selected according to the second flow rate of domestic drainage design; when there is displacement adjustment, it can be selected according to the maximum hourly flow rate of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L/s. The head of the sewage pump is calculated and determined according to the lifting height and pipeline loss, and then a certain free head is added. The free water head should be 0.02~0.03MPa. The flow velocity of the sewage pump suction pipe and outlet pipe should not be less than 0.7m/s, and should not be greater than 2.0m/s.
In public buildings, a spare pump should be set up for each domestic drainage sump, and it should be operated alternately at ordinary times. For the drainage of the basement, equipment room, and garage to flush the ground, if there are two or more drainage pumps, there is no need to install a pump. When the sump cannot be equipped with an emergency drainage pipe, the water pump should have uninterrupted power supply; when the drainage inlet pipe can be closed, the uninterrupted power supply may not be provided, but an alarm device should be provided.
When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be discharged together; when lifting general waste water, the outlet pipes of submersible sewage pumps in different sumps can be combined and discharged according to the actual situation .
When two or more water pumps share one outlet pipe, valves and check valves should be installed on the outlet pipe of each pump. When the drainage of a single water pump may cause backflow, a check valve should be installed. It is not allowed to combine the pressure drain and the gravity drain in the building. When the submersible sewage pump lifts large debris, the submersible sewage pump should be equipped with a crushing device; when lifting sewage containing more fibers, a large channel submersible sewage pump should be used.
When the motor power of the submersible sewage pump is greater than or equal to 7.5kW or the diameter of the water outlet is greater than or equal to DN100, the fixed self-coupling device of the water pump can be used; when the power of the motor of the submersible sewage pump is less than 7.5kW or the diameter of the water outlet is less than DN100, a hose can be installed Mobile installation. When a submersible sewage pump is used for drainage of the sewage collection tank, a fixed self-coupling device for the water pump shall be installed to facilitate maintenance of the water pump. The drainage pump should be able to start and stop automatically and manually start and stop on site. Multiple water pumps can be operated in parallel and alternately, and can also be put into operation in sections.
ZYF-16 self-operated differential pressure control valve does not require external energy, and relies on the pressure change of the medium to be regulated for automatic adjustment, automatically eliminates the remaining pressure head of the pipe network and the flow change caused by pressure fluctuations, and keeps the user's inlet and outlet pressure differences constant. Helps stabilize system operation. Especially suitable for household metering or automatic control system.
2. Performance characteristics of self-operated differential pressure regulating valve:
The differential pressure valve is a double disc structure with small unbalanced force of the valve stem and compact structure. It is used in the heating (air conditioning) water system to keep the pressure difference of the controlled system constant, and has the following characteristics:
1. Constant pressure difference of the controlled system;
2. Support the internal self-regulation of the controlled system;
3. Absorb the pressure difference fluctuation of the external network;
4. The advanced stepless pressure regulation structure is adopted, and the control pressure difference can be adjusted up to 25:1;
5. It has the function of automatically eliminating blockage;
6. The flange size conforms to GB4216.2 medium gray cast iron flange size.
The drainage pumps used in buildings include submersible sewage pumps, submerged sewage pumps, vertical sewage pumps and horizontal sewage pumps. Due to the generally small site in the building and the small displacement, submersible sewage pumps and submerged sewage pumps can be preferred for drainage pumps. Among them, submerged sewage pumps are generally used in important places; vertical sewage pumps and horizontal sewage pumps require isolation. Seismic foundation, self-irrigating water absorption, and occupying a certain amount of space, so it is rarely used in buildings.
The flow rate of fire pumps and sewage pumps should be selected according to the second flow rate of domestic drainage design; when there is displacement adjustment, it can be selected according to the maximum hourly flow rate of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L/s. The head of the sewage pump is calculated and determined according to the lifting height and pipeline loss, and then a certain free head is added. The free water head should be 0.02~0.03MPa. The flow velocity of the sewage pump suction pipe and outlet pipe should not be less than 0.7m/s, and should not be greater than 2.0m/s.
In public buildings, a spare pump should be set up for each domestic drainage sump, and it should be operated alternately at ordinary times. For the drainage of the basement, equipment room, and garage to flush the ground, if there are two or more drainage pumps, there is no need to install a pump. When the sump cannot be equipped with an emergency drainage pipe, the water pump should have uninterrupted power supply; when the drainage inlet pipe can be closed, the uninterrupted power supply may not be provided, but an alarm device should be provided.
When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be discharged together; when lifting general waste water, the outlet pipes of submersible sewage pumps in different sumps can be combined and discharged according to the actual situation .
When two or more water pumps share one outlet pipe, valves and check valves should be installed on the outlet pipe of each pump. When the drainage of a single water pump may cause backflow, a check valve should be installed. It is not allowed to combine the pressure drain and the gravity drain in the building. When the submersible sewage pump lifts large debris, the submersible sewage pump should be equipped with a crushing device; when lifting sewage containing more fibers, a large channel submersible sewage pump should be used.
When the motor power of the submersible sewage pump is greater than or equal to 7.5kW or the diameter of the water outlet is greater than or equal to DN100, the fixed self-coupling device of the water pump can be used; when the power of the motor of the submersible sewage pump is less than 7.5kW or the diameter of the water outlet is less than DN100, a hose can be installed Mobile installation. When a submersible sewage pump is used for drainage of the sewage collection tank, a fixed self-coupling device for the water pump shall be installed to facilitate maintenance of the water pump. The drainage pump should be able to start and stop automatically and manually start and stop on site. Multiple water pumps can be operated in parallel and alternately, and can also be put into operation in sections.
