2301型自力式流量调节阀

196

Product

BAIC GROUP

2301 Type Self-Operated Flow Regulator

Self-operated flow regulator (hereinafter referred to as flow valve) is a kind of energy-saving products

that do not need external energy, relying on the pressure change of the regulated medium itself to adjust the

flow rate automatically, and has the comprehensive functions of measurement, actuating and control.

Widely used for automatic control system in city heating, heating system and petroleum, chemical,

metallurgy, light industry and other industrial sectors. This product can be used for flow control of noncorrosive (up to 200℃) media such as liquids, gases and steam.

Connection dimensions and standards

This product consists of a valve body flat throttle valve, regulator seat, valve core, pressure

compensation balance bellows, upper and lower membrane covers, membrane, effective The specific

structure of the pressure spring is shown in Figs. 1 and 2.

Figure 2 DN150-250

Protective membrane

Throttle valve

Valve body

Valve seat

Valve core

Balanced bellows

Bonnet

Upper membrane cover

Membrane

Lower membrane cover

Actuator

When the controlled medium fluid upstream pressure P1

firstly flow through the variable throttle valve and

then flow through the valve seat to the valve, the variable throttle valve end surface and the upper diameter of

the valve seat d0

form a column shape throttling area d0F, whose value d0F = S.π.d0

, when it is less than the

diameter cross section of the regulator, the fluid will be throttled. A certain pressure difference ΔPs=P1

-Ps,

called the effective pressure, will be formed on the proximal both sides of d0. The flow rate of the fluid

- is the combined flow coefficient can be determined according to the Bernoulli equation of

fluid dynamics. Therefore, the measured amount of △Ps can indicate the actual flow size of the controlled fluid.

The cross-sectional area of a throttle valve is doF=Sπdo, so the throttle area d0F changes when the

value of s is changed. The larger S is, the larger its corresponding flow rate is. Adjusting the amount of the s

value enables the flow rate set value to be adjusted.

P1

and Ps pressure through the pipeline are introduced into the upper and lower membrane chamber, the

pressure difference △ Ps acting on the membrane F produces upward thrust, the counterforce generated by

the effective pressure spring compression displacement S will be balanced by (P1

-Ps)F membrane = S1K, S1

-

valve displacement, K-effective compression of the spring stiffness, due to the upper and lower valve seat flow

cross-section are basically the same so S1=S, so the regulating valve core always work at the set S value that

is the flow value position playing the role of flow regulation.

When the flow through the valve increases due to the process, i.e., when the load increases, Ps first

decreases and the value of (P1

-Ps) increases, the force acting on the F-membrane is upward, bringing the

valve core closer to the valve seat and causing Ps to increase. When the counterforce generated by the

effective compression spring compression displacement increase is balanced with the (P1

-Ps) increase in the

force acting on the F membrane, the valve core is stationary, at this time, the position of the valve core S2

and

the original setting flow rate corresponding to S1

will have a certain deviation, which means that the regulator

plays a role in regulating to a certain extent. The flow rate will return to within the tolerance allowed by the set

value.Conversely, when the load flow is reduced, the opposite regulation action can also play a regulatory role.

In order to improve the regulating accuracy of flow regulator , the product is equipped with a pressure

balancer, whose function is to compensate for the flow error caused by the fluctuation of pressure P1

, Ps

before the valve and P2

after the valve, Ps pressure is introduced into the outer chamber of the balanced

bellows through the middle hole of the connecting rod of the valve core, and the P2

pressure is introduced into

the inner chamber of the bellows, and the bellows effecting area is designed equal to the flow cross section of

the valve seat, which can offset the force of Ps and P2

acting on the valve core, and the position of the valve

core only depends on the magnitude of the effective pressure △Ps, which improves the accuracy of flow

regulation.

Figure 1 DN15-125

Note: ① The total height and weight of the flow valve part are the sum of the

height and weight of the control valve and actuator, respectively.

② Nominal pressure: PN16; PN40

③Flange standard: normally GB9113-2000 standard, can also provide

users with the following flange standard products, but should be

specially indicated when ordering:

1) DIN (Germany) 2) ANSI (USA)

3) JPL (Japan) 4) JIS (Japan)

Outline dimensions and weight

197

Product

BAIC GROUP

Figure 3 DN15-125 Figure 4 DN150-250

Approx.

weight(kg)

Nominal

diameter

DN (mm)

2. The outline dimensions of the actuator

are shown in Fig. 5 Fig. 6 and Table 2.

* Effective area A (cm²)

Approximate weight (kg)

Nominal diameter DN

Figure 5 A=280

Figure 6 A=600

1. Valve body outline dimensions and weight as shown in Figure 3, Figure 4 and Table 1

Accessories category and outline dimensions

Figure 7 Extension part (for temperatures >140°C) Isolation tanks (for temperatures >140°C)

Product main technical parameters

Note: The flow rate range needs to be converted when the medium fluid is not water.

Note: ▲DN150 above medium temperature of 140 ℃ to 200 ℃ matching isolation tank

and extension part.

▲ Stainless steel is available upon special request.

▲ Attention should be paid to the relationship between the actual operating pressure

and the operating temperature.

198

Product

BAIC GROUP

Nominal diameter DN (mm) 15 20 25 32 40 50 65 80 100 125 150 200 250

Kvs value 3.2 5 8 12.5 20 32 50 80 125 160 320 450 630

Max. flow rate at

effective

pressure (m³/h)

0.02MPa 1.5 2.5 3.5 5.5 9.0 14 22 36 55 70 140 200 280

0.05MPa 2.5 3.5 5.5 9.0 12 22 36 55 85 110 220 320 450

PN16 Max. differential

pressure

△P(MPa)

1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.5 1.5 1.2 1.0 1.0

PN40 Max. differential

pressure

△P(MPa)

2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.5 1.5 1.2 1.0 1.0

Liquid: ≤140°C; Air: ≤

Max. operating temperature

80°C

Matching isolation tank: ≤200°C*

Allowable leakage amount 4×10-4×Rated valve capacity

Under specified test

conditions 10 bubbles/min 20 bubbles/min 40 bubbles/min

Pressure balancing elements Bellows Rolling membrane

Nominal pressure PN16(1.6MPa) PN40(4.0MPa)

Valve body material ** Cast steel

Valve core material Stainless steel, soft seal is PTFE + 0Cr18Ni9

Max. operating pressure ** Nominal pressure Note △Pmax

△Ps

Set flow range

m³/PMedium:

Water

0.02MPa 0.15 ~2 0.15 ~2 0.15 ~5 0.15 ~5 1.5 ~12 1.5 ~12 2.5 2.5 ~30 ~30

4~

70

4~

70

△Ps

0.05MPa 0.15 ~3 0.15 ~3 0.2 ~8 0.2 ~8 2~ 20 2~ 20 4~ 50 4~ 50 6~ 100 6~ 100

199

Actuator technical parameters

Product

BAIC GROUP

Rolling membrane is suitable for water, steam or oil and other media, the type of media (whether oil

resistance is required) should be specified when ordering.

Effective area (cm²) 280 600

Effective pressure (MPa)

0.02

0.05

Allowable differential pressure between upper and lower

membrane chamber (MPa) 0.4 0.15

Nominal pressure PN40

Material

Film cover Cast steel

Rolling membrane EPDM or FKM sandwich fiber※

Control pipeline, connectors Copper or steel pipe 8×1,

Ferrules connector M12×1.25

Insulation tank For use at 140°C or above

Extension part DN150~250 For use at 140°C or above

Note: △EPDM is suitable for water, steam and air media, FKM is suitable for oil, water, steam and

gas media, the type of media (whether oil resistance is required) should be specified when ordering.

Installation example

Installation example shown in Figure 9

Figure 9 Multi-user flow rate control

1. A few notes on site installation:

a. Site safety: the pipeline where the flow valve is installed should not be pressurized beforehand, and the

globe valves before and after the flow valve should be closed. Appropriate fire precautions should be

taken before welding is performed.

b. control performance: piping system pressure loss should be consistent with the loss considered in the

calculation of the size of the flow valve, import and export should have a certain straight segment

(generally 5D ~ 10D), in order to ensure the required control performance.

c. Installation position: there should be enough space for the operator to install and adjust the flow valve,

as well as to ensure the possibility of in site disassembly and maintenance of the flow valve and

accessories.

d. Filter: In order to ensure the normal use of the flow valve, filters should be installed in front of the flow

valve during installation and cleaned periodically. In plants with steam, there should be adequate

drainage and ventilation systems.

e. Flow valve group: Generally in the process piping, cut-off valves and bypass valves are installed to

form a valve group to adapt to the needs of continuous operation of the equipment. For maintenance and

unforeseen conditions, isolate with a cut-off valve and regulate with a bypass valve. The following layout

is recommended. f. In order to facilitate the regulation, display flow meters should be installed at

appropriate locations after (or before) the valve and near the valve where they can be easily observed.

Pressure gauge

200

Globe valve

Product

BAIC GROUP

Filter

Globe valve

Flow valve Globe valve Flow meter

Figure 10 Flow valve arranging method

2. Site installation

A. The installing personnel should first realize that the flow valve is a precision instrumentation equipment, can not be

collision, fall in order to avoid damage, affecting product performance.

B. The piping system should be flushed before the initial start-up and after the shutdown for maintenance, and then

the flow valve should be installed and the pressure in the pipeline should not exceed the limit value of the flow valve.

C. Be sure to install the flow valve in the direction of media flow (arrow on the valve body) as shown on the flow valve.

D. The flow valve should be mounted vertically upside down on the pipe. That is, the actuator is at the bottom and the

regulator is at the top, as shown in Figure 10. This ensures that the temperature of the medium is not transferred to

the actuator. When the medium temperature is below 80°C, the flow valve must be mounted upside down, i.e. with the

actuator mounted downwards. Supporting brackets should be added where the valve has a large weight or vibration.

3. Connection of control valve and actuator

Generally, regulators and actuators are shipped after connection and commissioning. If the user needs the

products to be shipped separately, it should be noted that after the arrival of the goods, it should be connected and

commissioned before use, first use the connecting nut to lock the actuator to the bonnet, then use copper or steel

pipe to connect the (+) and (+) ports (copper pipe 8 x 1 ferrule type connector M12 x 1.25), as shown in the figure.

201

Port

Product

BAIC GROUP

Port Port Port

Bonnet

Bonnet

Figure 11 Connection of control valve and actuator

Ordering information

When ordering, users are requested to provide the following materials

· Product model

· Nominal pressure and upstream pressure P1

· Nominal diameter

· Flange standards

· Effective pressure and effective area

· Requirements to control flow value

· Valve body material

· Media type, density and temperature

· Whether there are special requirements

Technical parameters are subject to change without notice!