zfvalve

Function: The dynamic flow balance valve keeps the flow constant between 31-600KPa.

 

Role: Keep the flow through the valve constant.

 

Theory: When the incoming flow pressure P1 increases, the sleeve of the valve sleeve moves downward, compressing the spring inside the valve bladder, and reducing the flow area of the valve hole at the bottom of the valve bladder, that is, reducing the Kv value of the valve bladder. Thus, although the pressure difference ΔP across the damper is increased, the Kv value is reduced, and the product of the two, that is, the flow rate Q, remains substantially unchanged under the action of the spring.

 

The pipeline of the constant flow system is installed at the end without stepping.

 

The pump system is chilled water pump and cooling water pump to prevent the pump from over-flowing when the number of units changes.

 

A place where a constant flow rate is required, such as a cooling tower.

 

Water supply pipes or return pipes can be installed.

 

Selection and precautions

 

Selection: Only according to the flow selection.

 

The valve pressure working range is greater than the minimum starting pressure difference.

It cannot be installed in series with the proportional integral electric control valve.

Constant flow system hydraulic balance scheme

 

Dynamic differential pressure balancing valve

 

Theory: The high pressure upstream of the electric regulating valve is guided to the lower side of the control bellows through the pressure guiding tube; the pressure downstream of the electric regulating valve is guided to the upper side of the control bellows through the external pressure guiding tube or the internal pressure guiding hole.

 

When the pressure on the high pressure side rises, the bellows moves upwards, causing the valve stem and the valve cone to move upward, causing the pressure on the medium pressure side to rise, thereby dynamically maintaining the pressure difference between the medium pressure side and the high pressure side and the spring. The preset force balance ensures the dynamic constant of the pressure difference across the electric control valve. When the pressure on the high pressure side is lowered, the bellows moves downward, and the situation is similar.

 

Adjust the differential pressure of the spring to adjust the differential pressure setting.

 

Function: Dynamically keep the pressure difference between the controlled points constant at the set value.

 

Function:

 

Ensure dynamic chilled water balancing of the controlled system to prevent dynamic imbalance in the system.

 

Prevents noise and vibration from being generated by the electric control valve regulating valve.

 

The regulating valve in the system can be selected with a driver with less driving force to avoid the danger of burning the valve.

 

Provides good valve authority for the regulating valve, ensures the realization of the linear heat-dissipating controlled system, and ensures the rapid and stable system.

 

The debugging workload is very small, the installation cycle is accelerated, and debugging can be avoided when the system is changed or expanded.

 

Conveniently correct the difference between actual and design conditions.

 

Maximum flow limit function.

 

Ensure dynamic hydraulic balance of the controlled system.

 

The dynamic differential pressure balancing valve dynamically maintains the pressure difference ΔP between the controlled points constant at the set value, and the Kv value of the other unoperated electric regulating valve does not change, so the water quantity of the branch is dynamically constant. The amount of water in the branch changes only when the electric regulating valve is actuated, that is, when the Kv value changes.

 

Prevent electric noise and vibration from the electric control valve.

 

The adjustment valve uses a driver with a smaller driving force.

 

The pressure difference between the two ends of the electric regulating valve is constant, and the pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve. Therefore, the adjusting valve uses a driver with a smaller driving force.

 

Provides good valve authority for the regulator valve.

 

Definition of valve authority:

 

The pipeline of the fixed and variable flow system is installed at the end without step by step.

 

The pipeline, branch pipe or riser of the variable flow system is installed without stepping.

 

The valve of the single-pressure pipe must be installed back to the water, and the valve water supply or return pipe of the double-pressure pipe can be installed.

 

Selection: The valve body is selected according to the Kv value. The Kv value of the selected valve is greater than the design value. The valve pressure drop is used to calculate the valve Kv value, not the control pressure difference. Select the drive with a controlled differential pressure.

 

Dynamic differential pressure balance electric control valve

 

Theory: The essence is that a dynamic differential pressure balancing valve and an electric regulating valve are combined into one. The valve is a double valve cone structure, the upper valve cone is the valve cone of the electric regulating valve, and the lower valve cone is the valve of the dynamic differential pressure balancing valve. Cone, the dynamic differential pressure balancing valve provides a constant pressure difference (0.2Bar or 0.5Bar) before and after the electric valve cone (upper valve cone). The pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve, when the electric valve cone ( When the upper valve cone is not actuated, the valve flow capacity kv is constant, and the pressure difference ΔP is constant, so the flow rate Q of the valve is constant; only when the electric valve cone (upper valve cone) acts, the flow through the valve will Changes have occurred, thus achieving a perfect unification of dynamic balance and adjustment functions.

 

Process: The upper and lower ends of the diaphragm form a balance with the force of the internal spring, ie P1 = P2+P spring.

 

When the system pressure fluctuates, when P1 increases, the balance is destroyed, and the force below the diaphragm is greater than the upper side, so the diaphragm will move upwards, close the small differential pressure control valve spool, so that P2 increases and reaches equilibrium again. Show.

 

On the contrary, the differential pressure control valve is opened so that the pressure difference of the regulating valve spool is always constant throughout the operation of the switch, so that the flow rate change through the valve is only one-to-one corresponding to the opening degree of the regulating valve.

 

 

 

The pipeline of the variable flow system is installed at the end without stepping.

 

The main advantage:

 

The occupied space is small, and the automatic balance of the system is good.

One leak point is missing for each group of valves.

Easy to install and maintain.

Disadvantages:

 

It is not as flexible as the split solution (dynamic differential pressure balance valve + electric control valve), and the differential pressure of the split solution can be adjusted on site.

Variable flow system hydraulic balance scheme

 

Solutions to common phenomena of hydraulic imbalance:

 

The system is uneven in temperature and heat. The running energy consumption of the pump is too high → hydraulic calculation, reasonable piping, the same program, static balancing valve. Dynamic differential pressure balancing valve or dynamic flow balancing valve, integral valve.

Variable flow system operation is out of regulation. The load is stable, but the room regulating valve moves frequently, causing the room temperature to fluctuate frequently. The system stabilization time is too long → dynamic differential pressure balance valve or integral valve.

The regulating valve produces noise and vibration. The regulating valve is not closed, and there is a danger of burning the valve in severe cases. The valve of the regulating valve is too small, the curve of the valve is deformed, and the linear heat-dissipating controlled system becomes a controlled system of the throwing heat. Dynamic differential pressure balancing valve or integral valve.

 

Hydraulic balance valve, also known as self-operated balance valve, flow control valve, flow controller, dynamic balance valve, flow balance valve, is an intuitive and simple flow adjustment control device. The application of the hydraulic balancing valve in the pipe network allows the flow to be set directly according to the design. The valve automatically eliminates the flow deviation caused by the residual head and pressure fluctuations of the pipeline under the action of water. The set flow rate is maintained regardless of changes in system pressure. These functions of the valve make the pipe network flow adjustment complete once, and the network adjustment work becomes a simple flow distribution, effectively solving the hydraulic imbalance of the pipe network.

 

Chinese name: hydraulic balance valve

 

Medium temperature: 0-150 ° C

 

Working pressure: 1.6MPa

 

Working temperature: 150 ° C

 

Scope of application

 

 

 

The hydraulic balance valve is mainly used in centralized heating (cold) and other water systems to distribute the flow of the pipe network as needed, eliminate the hydraulic imbalance of the water system, solve the problem of uneven heat and heat, and save energy and save 15%-20%. .

 

Performance characteristics

 

(1) It can set the flow according to the design or actual requirements, which can automatically eliminate the pressure difference fluctuation of the system and keep the flow rate unchanged.

 

(2) It overcomes the uneven heat and cold of the system and improves the quality of heating (cooling).

 

(3) It completely solves the contradiction that the pressure difference between the proximal end is large and the pressure difference at the distal end is small.

 

(4) It can reduce the amount of circulating water in the system and reduce the resistance of the system.

 

(5) It can reduce the design workload, and does not require complicated hydraulic balance calculation on the pipe network.

 

(6) It can reduce the difficulty of network adjustment, simplifying complicated network adjustment work into simple traffic distribution.

 

(7) It can eliminate the traffic redistribution work when the heat source of the multi-heat source pipe network is switched.

 

(8) The flow rate display values are all randomly calibrated on the test bench, and the flow rate (m3/h).

 

Technical Parameters

 

Working pressure difference: 20-600KPa;

 

Flow accuracy: 5%.

 

Material and life:

 

Body - high quality grey cast iron

 

Internals - brass, stainless steel

 

Spring - stainless steel

 

Diaphragm - EPDM

 

Lifetime - more than ten years

 

Selection:

 

It can be selected according to the pipe diameter.

 

It can be selected according to the maximum flow rate and the flow range of the valve.

 

 

The difference between the two balancing valves is that the thermostatic balancing valve

 

manually adjusts the opening degree of the thermostat valve, while the auto balancing valve automatically adjusts the opening degree of the thermostat valve by using temperature sensors.

 

 

 

Thermostatic balancing valve (referred to as constant temperature valve) is an energy-saving product. The principle is to control the temperature of the valve by using the temperature sensor in the temperature control valve head. When the room temperature rises, the temperature sensor expands due to thermal expansion and compresses the stem to make the valve close small. When the room temperature drops, the temperature sensor shrinks due to cooling, and the stem springs back to open the valve. Therefore, when the room has other auxiliary heat sources (sunlight, other heaters) and the room temperature is higher than the set temperature, the valve automatically closes down, the water intake of the radiator decreases, ultimately saving the heat of heating.

 

The setting temperature of the auto balancing valve can be adjusted artificially. The constant temperature valve will automatically control and adjust the water quantity of the radiator according to the set requirements, so as to achieve the purpose of controlling the indoor temperature. Temperature control in user's room is realized by constant temperature control valve of radiator. The constant temperature control valve of radiator is composed of a constant temperature controller, a flow regulating valve and a pair of connectors. The core component of the constant temperature controller is the sensor unit, namely the temperature package. The temperature chamber can induce the volume change caused by the change of ambient temperature, drive the valve core to produce displacement, and then adjust the water quantity of the radiator to change the heat dissipation of the radiator.

 

 

Strainers, dirt separators and backflow preventers are designed to prevent impurities from entering the specified pipe section. Comparing these three types of products, we can analyze from the following points: first, flow resistance. Many manufacturers tend to ignore this point and push the performance of the product to push the product's practicality. However, if the flow resistance fails to meet the requirements, and there will be impurities in the later stage, the flow resistance will be larger and larger, especially affecting the energy consumption, thus the gain is not worth the loss.

 

 

 

The flow resistance of ZhengFeng's products is tested by the third-party testing center in China to achieve the best product status and reduce the daily operating costs of customers; Second, the filter core material. If used in medium for a long time, the filter core material shall have a long life, which can prevent frequent replacement and the risk of secondary pollution caused by corrosion of the filter core being washed away; Third, filtering performance.

 

This is also a point that will be paid attention to. According to the customer's working conditions, ZhengFeng can customize a special filter to achieve the use effect; Fourth, discharge function. In the market, the function of sewage discharge is often neglected, and some manufacturers may only consider the part of filtration function while missing the part of timed emission. All sorts of surprises are hard to predict, apart from the human cost, if cleaning is required. Therefore, the filtering products of ZhengFeng have additional sewage discharge devices, such as y strainer with drain valve, magnetic y strainer, magnetic dirt separator, etc., to meet the requirement that customers can easily open the device outside the valve and clean the impurities inside the valve without removing the valve.

Basic information

 

This valve is used as a two-way closed circuit device.

 

Features

 

1. No need for sluice Wells, which reduces the amount of installation work;

 

2. Does not affect the traffic, and underground parts of the integration, effectively prevent theft;

 

3. Stem has a special extendable structure, which can effectively prevent the ground from sinking;

 

4. Long life, no internal leakage.

 

 

 

Principle

 

This underground gate valve uses the form of pin coupling to transfer the sensor force existing in the gearbox and transmission shaft buried in the ground. The telescopic drive rod is extended until it is installed in the underground bonnet. This layout and approach ensure that work is done properly and efficiently.

 

Installation and Commissioning

 

Connect the valve with the water supply pipe, extend the expansion drive rod to the set height, tighten the expansion limit device to maintain the extension height, backfill the pipe groove, tamp and make cement pier foundation, put the valve box plate on the cement foundation, place the valve box cover, lay the road surface and make the valve box cover equal to the road surface. For specific use, please consult ZhengFeng Valve Group.

Basic Information

 

This non slam check valve prevents backflow of media and reduces water hammer to achieve the safe and quiet effect.

 

 

 

Features

 

1. Small fluid resistance, large flow;

2. Automatic control using medium energy;

 

3. Prevent water hammer phenomenon;

 

4. Slowly-closing silencing.

 

 

 

Principle

 

When the pipe supplies water from the inlet end of the valve, the water from the needle valve and one-way valve enters the valve cover control room and then is discharged downstream through the ball valve. Due to the small opening of the needle valve, the discharge speed of the control room is greater than that of the inlet to replenish water, thus reducing the pressure in the control room. The inlet pressure acting under the main valve disc all the time lifts the main valve disc, thereby opening the main valve disc and supplying water downstream. When the pipeline stops supplying water, the downstream water begins to flow back. Due to the effect of the one-way valve, the backflow water cannot flow out after entering the valve cover control room through the ball valve. As a result, the pressure of the valve cover control room increases gradually and the main valve disc is closed tightly.

 

Installation and Commissioning

 

Needle valve and ball valve adjust together to get the best opening or closing speed. For specific use, please consult ZhengFeng Valve Group.

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Product scope , Standards & Materials

 

Size Range: 2"~24"

Pressure Rating: 10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2

Coating: Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2