The ZCM series semi-direct acting automatic gas and low-pressure gas-liquid solenoid valve (nominal diameter ranging from DN10 to DN100) is a high-security, large-bore fluid control device specially designed and developed for automated pipeline control of gas safety, gas drainage, low-pressure large-flow, and atmospheric pressure vacuum pipelines. As a core execution element in inflammable and explosive gas pipe networks and various industrial low-pressure fluid control loops, this series features deep structural optimization targeting low pressure below 4bar (0.4MPa), zero-pressure conditions, and the chemical characteristics of specialized media like gas. It focuses on solving common industry pain points under ultra-low pressure environments, such as the inability of traditional pilot valves to open due to insufficient pressure differential, and the tendency of pure direct acting valves to overheat and burn out due to excessive coil power consumption under large-bore conditions. The series offers multiple premium valve body materials including brass, SS304 stainless steel, and heavy-duty cast iron (where JF/CF represents high-strength flange versions of different materials). Small-bore valves utilize G/NPT thread connections, while large-bore valves adopt international standard flange connections, perfectly matching urban gas boiler networks, gas power generation pipe networks, industrial kiln combustion control, low-pressure gas-liquid mixed transmission, and various industrial safety protection systems.
This series of valves utilizes a semi-direct acting (also known as lift-type direct acting) control mechanism and belongs to the normally closed automatic valve type. Its core advantage lies in the perfect integration of the zero-pressure differential startup characteristic of direct acting valves and the fluid dynamic assistance characteristic of pilot valves. When the electromagnetic coil is de-energized, under the rigid compression action of the return spring force, the pilot hole remains closed, and the medium enters the cavity above the main valve core (diaphragm or piston) through the fluid channel. Under the combined action of the main spring force and the gas system's own pressure, the sealing assembly is tightly pressed against the main valve seat, achieving absolutely reliable, zero-leakage airtight shut-off.
When the electromagnetic coil is energized, a customized electromagnetic assembly instantly generates a powerful electromagnetic attraction force that first opens the pilot hole, and pressure in the cavity above the main valve core quickly relieves to the outlet end through the pilot hole. Simultaneously, the moving iron core of the electromagnet directly pulls up the main valve core assembly through a specialized mechanical linkage lift structure. In extreme working conditions where the system pressure differential is 0bar (such as zero pressure differential, vacuum, or system startup without pressure), the electromagnetic force can directly and rigidly pull open the main valve port, achieving millisecond-level rigid actuation and precise switching. When a weak pressure differential exists in the system, the main valve port is fully opened through the collaborative thrust generated by the electromagnetic attraction force and the medium pressure differential, restoring ultra-large flow unhindered passage. Once the coil is de-energized, the electromagnetic field disappears, and the valve core assembly resets and locks at high speed within milliseconds under the drive of the main spring force, completing a rapid and rigid safety shut-off.
Product Image:ZCM Automatic Solenoid Valve for Gas and Low-Pressure Gas-Liquid