Proportional Control Valves

Motorized Proportional Control Valves

Motorised proportional control valves position the plug of a globe valve according to the control signal by means of an electric linear actuator, continuously adjusting temperature, pressure or flow in heating, cooling and steam circuits in plants where compressed air is not available. The actuator operates as three-step (open–stop–close) or with an integral positioner.

Valve bodies are made from DN15 to DN300 in PN10–PN40 classes, in grey cast iron, ductile iron, cast steel and cast stainless steel. Actuator thrust is 0.5–5 kN depending on model and rated travel is 15 or 30 mm. Positioner types accept 0/4–20 mA or 0/2–10 V and provide position feedback in the same range; fail-safe types with spring and electromagnet close or open the valve when power fails.

0.5–5 kNactuator thrust

15 / 30 mmrated travel

DN15–300body sizes

IP65actuator protection

Buy Now Request a Quote

Main Applications

District and central heating heat exchangers
Air handling unit heating and cooling coils
Process heaters running on steam and hot water
Flow control in plants without compressed air
Control points connected to building automation

Technical Data

Actuator type	Electric linear; three-step or with positioner
Thrust	0.5–5 kN (depending on model)
Transit time	Three-step: approx. 60–300 s · positioner: 30–240 s; 15–60 s with fast motor
Supply	Three-step: 230 V or 24 V, 50 Hz · positioner: 24 V AC/DC or 100–240 V AC
Input signal	0/4–20 mA or 0/2–10 V
Position feedback	0/4–20 mA or 0/2–10 V; potentiometer on three-step
Fail-safe action	Spring and electromagnet extend or retract the stem; types tested to DIN EN 14597
Protection and ambient	IP65 · operation 5–60 °C
Characteristic	Equal percentage or linear; rangeability 50:1 (DN15–50)
Leakage class	Metal IV · high-performance metal V · soft seat VI
Kvs range	0.1–1500 m³/h (by size and plug)
Temperature	−10 / +220 °C with standard bonnet; up to 400 °C with insulating section or bellows

Material Options

Part	PN16 · grey cast iron	PN25 · ductile iron	PN40 · cast steel	PN40 · stainless
Body	EN-GJL-250 (EN-JL1040)	EN-GJS-400-18-LT (EN-JS1049)	1.0619	1.4408
Seat	1.4006 / 1.4008	1.4006 / 1.4008	1.4006 / 1.4008	1.4404 / 1.4409
Plug	1.4006	1.4006	1.4006	1.4404
Stem packing	PTFE-carbon V-ring, 1.4310 spring	PTFE-carbon V-ring, 1.4310 spring	PTFE-carbon V-ring, 1.4310 spring	PTFE-carbon V-ring, 1.4310 spring
Actuator housing and cover	Glass-fibre reinforced PPO	Glass-fibre reinforced PPO	Glass-fibre reinforced PPO	Glass-fibre reinforced PPO
Cable entry	3 × M20×1.5 polyamide glands	3 × M20×1.5 polyamide glands	3 × M20×1.5 polyamide glands	3 × M20×1.5 polyamide glands

Installation note: The actuator must not be mounted upside down (suspended); IP65 protection applies with cable glands fitted and the cover closed. Actuators with positioner and fail-safe action have no mechanical manual override. Fitting a flanged strainer ahead of the valve protects the plug and seat. Fast magnetically actuated types are also part of this group; their values depend on the model.

Advantages

No Air Needed

Only an electrical supply is required.
Suits plants without a compressor.

Standard Signals

mA and V inputs, feedback of the same type.
Direct connection to automation systems.

Fail-Safe Option

Spring closes or opens on power failure.
Overtemperature protection in heating circuits.

Class Choice

Four body materials from PN16 to PN40.
A body suited to steam and hot water.

Limit Contacts

Two mechanical or electronic contacts.
Position information and interlocking.

Construction and Design Features

Flanged globe body with single-seated plug
Electric linear actuator mounted on the yoke
Optional integral positioner and feedback module
Optional fail-safe unit with spring and electromagnet
Manual positioning with hex wrench (three-step types)

Send the fluid, flow, pressure drop, temperature, control signal and supply voltage through the Request a Quote form; we will prepare the motorised valve by Kvs and actuator thrust.

How to Choose?

Calculate KvsFind the required Kvs from design flow and the differential pressure across the valve.
Check thrustChoose an actuator with enough thrust for the shut-off differential pressure.
Choose the control typeSelect a three-step or positioner actuator to suit the controller.
Define fail-safe needsIf the valve must close on power failure, choose the spring-return fail-safe type.
Match the body to servicePrefer cast steel or stainless bodies for steam and high temperatures.

Complementary Products

Electric Actuators Heat Exchangers Process Control Instruments Circulation Pumps Flanged Y-Type Strainers Metal Bellows Expansion Joints

Why ORFA?

Since 1985Over 40 years of experience in supplying industrial installation equipment.

Technical ConsultancyWe help with Kvs, actuator thrust and signal compatibility selection.

Delivery from StockMotorised control valves are supplied from stock or at short notice.

Spare PartsPacking sets, plugs, seats and other valve spare parts from a single source.

In This Group

Other Proportional Control Valves

Pneumatic Proportional Control Valves

Pneumatic proportional control valves operate with compressed air and a positioner to continuously regulate process variables.

Details →

Our Products

Our Motorized Proportional Control Valves

ORFA supplies motorized proportional control valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.

Electric Proportional Control Valve

Electric proportional control valve with motor or solenoid actuator, 0–10 V / 4–20 mA control, 2 and 3-way globe body, DN15–DN80 and above, PN16 / PN40.