Low flow control valves

Low flow control valves are a type of top-guided single-seated control valve, characterized by their simple structure, good sealing performance, and reliable operation.

The effective and sufficient top guide system overcomes vibrations at small openings, resulting in a longer effective service life. The smaller flow coefficient expands the valve’s range of applications.

The actuator can be selected from various options, including multi-spring pneumatic diaphragm mechanisms or electric actuators.

Low flow control valves

Performance

Actuator Selection

 

Pneumatic Diaphragm Actuator

Fully Electronic Electric Actuator

 

 

Multi-spring Type

Integrated Smart Type with Internal Control Box

 

Application

Regulation, On/Off

Regulation

Air Supply Pressure/Voltage

Supply Pressure (Spring Range))

140(20-100) Kpa G

240(400-200) Kpa G

280(80-240) Kpa G

 

Power Supply AC 200 V±10% 50Hz

or

Power Supply AC 380 V±10% 50Hz

Connection

Air pipe connection RC1/4

Standard: Cable entry 2-PE (G1/2″)

Explosion-proof: Protective sleeve PE (3/4″) can be installed

 

Direct Action

Increasing air pressure moves stem downward, valve closes

Increasing input signal moves stem downward, valve closes

Reverse Action

Increasing air pressure moves stem upward, valve opens

Increasing input signal moves stem upward, valve opens

Hysteresis

≤1%FS (with positioner)

≤0.8%FS

Linearity

2%FS (with positioner)

≤±1%FS

Ambient Temperature

-10°C ~+70°C

Standard type: -10°C ~ +60°C

With space heater: -35°C ~ +60°C

Explosion-proof type: -10°C ~ +40°C

Surface Coating

Green, acrylic polyurethane enamel 

Blue, acrylic polyurethane enamel

 

Optional Accessories

Electric (pneumatic) valve positioner, filter regulator, valve transmitter, solenoid valve, limit switch

Space heater

Standard Specifications

Valve body type

Straight-through cast globe valve body

Valve plug type

Unbalanced single-seat piston plug

Nominal diameter

DN15/20/25 NPS 1/2”-1”

Nominal pressure

PN16~100, CLASS 150LB~600LB

Connection type

Flange FF, RF, MF, RTJ; Welding SW, BW

Face-to-face dimension

Complies with IEC 60534

Bonnet types

Standard type (-5°C~230°C);

Extended bonnet with cooling fins (for temperatures above 230°C);

Low-temperature extended type (-196°C~-45°C);

Bellows sealed type, Jacketed type

Packing

V-ring PTFE packing, flexible graphite packing, etc.

Gasket

Metal-reinforced graphite gasket

Actuator

Pneumatic multi-spring diaphragm actuator, piston actuator, electric smart actuator

Surface coating

Green acrylic polyurethane paint

Special Specifications

Special inspectionsBody material penetrant testing (PT), radiographic testing (RT), flow characteristic test, low-temperature test.
Special treatmentsNitriding treatment for internal parts, hard alloy coating for sealing parts
Special cleaningCompletely oil-free, dehydration treatment
Special specificationsSpecial piping or special air fittings, vacuum service conditions, stainless steel fasteners, special coatings
Special dimensionsCustomized according to user’s structural length or external dimensions

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we look forward to collaborating with you.