Electric single-seat control valve

Electric single-seat control valve consists of a straight-travel electric actuator and a single seat globe valve body. With built-in servo unit for receiving the signal of 4-20mA or 1-5VDC, and transform the current signal into corresponding straight travel displacement, automatically modify the opening of the valve to continuously control the pressure, flow rate, temperature and liquid level in the pipeline, Temperature, level and other process parameters of continuous adjustment. Electric single-seat control valve is suitable for applications of strict requirement to leakage, low differential pressure between upstream and downstream of the valve, and  the fluid has a certain viscosity or has small amount of fiber.

Valve body structure

1-Body,   2-Seat,   3-Gasket,   4-Valve plug   5-Bushing,   6-Gasket,   7-Bonnet
8-Packing,   9-Packing bushing,   10-Gland,   11-Stem,   12-Hex nut,  13-Stud
14- Hex nut,   15-Stud

Main technical data



Single-seat globe valve

Size (DN)

20、25、32、40、50、65、80、100、125、150、200 mm

Pressure rating

PM1.6、4.0、6.4 Mpa / CL150LB, CL300LB, CL600LB,

Flange standard

JB/T79.1-94、79.2-94、ANSI B16.5

Body material


Bonnet structure


Standard type: (-5 ~ 230 ℃), Heat dissipation type:(-45 ~ 230 ℃),

Low temperature type:(-196 ~ -45 ℃),Bellow sealed type

Bonnet type



V-type PTFE / flexible graphite

Trim structure

Single-seat / plunger disc

Trim material

Seat & Plug: SS304/SS316 surfacing welding Stellite, 

Shaft: SS304/SS316

Flow characteristic

Equal percentage / Linear



Flow characteristic

Linear,  percentage

Allowable range

50:1 ( CV<6.3 30:1)

Rated Cv value

Percentage CV1.6 ~ 630, Linear CV1.8 ~ 690

Leakage grade

Metal seal: IV grade ( 0.01% rated capacity )

Soft seal: VI grade (leakage standard: GB/T 4213)

Intrinsic error

±1.0 %

Return difference

≤1.0 %

Dead zone

≤1.0 %

Difference from beginning to end

±2.5 %

Rated travel difference

≤2.5 %

Note: performance listed base on the packing material in PTFE




Electric actuator, intelligent integrated



Power supply

220VAC ±10 % 50Hz, 380VAC ±10 % 50Hz,

Input signal


Action to close

Input signal increase, valve stem descend, valve close

Action to open

Input signal increase, valve stem ascend, valve open


≤0.8 %FS

Linear type

≤1 %FS

Environmental temperature

Standard type: -10℃~+60℃

With space heater: -35℃~+60℃

Explosive proof: -10℃~+40℃