The STP21 direct-acting solenoid valve adopts a direct-acting structure where the solenoid coil directly drives the valve core to open and close, operating without relying on medium pressure differential, achieving zero pressure differential start. Port sizes 1/8, 1/4, 3/8 inch, bore DN4-DN10, pressure 0-10bar, suitable for fluid control under small bore, low pressure differential or zero pressure differential conditions.
Technical Parameters
Parameter
Value
Bore
DN4-DN10 (1/8, 1/4, 3/8 inch)
Working Pressure
0-10bar (zero pressure differential start)
Working Temperature
-5C to 80C
Valve Body Material
Brass / Stainless Steel
Voltage
AC220V / DC24V
Seal Material
NBR / EPDM / PTFE
Action Mode
Normally Closed / Normally Open (optional)
Connection
Internal Thread
Product Features
Zero pressure differential start: operates without medium pressure differential, suitable for vacuum and low pressure conditions
Direct-acting structure: extremely fast response, reliable operation
Small bore design: suitable for precision flow control
Simple structure, easy maintenance
Normally closed / normally open types available
Material options: brass or stainless steel
Selection and Installation Guide
For zero or low pressure differential conditions, direct-acting type is preferred
Select port size based on flow requirements (1/8, 1/4, 3/8 inch)
For large bore and high flow conditions, pilot-operated type is recommended
Install with valve body arrow aligned with fluid flow direction
Install coil vertically upward to avoid liquid accumulation
When medium contains impurities, install a filter before the valve