Solenoid Valve Sizing

To acquire dependable efficiency with solenoid valves on refrigeration or air-con programs calls for cautious consideration of software necessities in the course of the choice course of.

Sporlan presents all kinds of solenoid valve sizes and types which can be employed in refrigeration and air-con programs to electrically management refrigerant circulation. Solenoid valves are electrically operated ‘stop-valves.’ These are both absolutely open or absolutely closed. Bear in mind these don’t modulate circulation.

Two Fundamental Solenoid Valve Varieties:

Solenoid valves are usually categorized in accordance with the stem and plunger motion.

1. Direct appearing – Energizing the coil instantly opens the primary port of the valve permitting full circulation.

   
   

   A direct appearing valve pulls the plunger in opposition to inlet stress and is usually restricted to small functions or the place there’s a low stress differential throughout the valve.

2. Pilot operated – Energizing the coil opens a pilot port which releases stress above the primary disc/piston/diaphragm permitting it to maneuver to an open place for full circulation

   
   

   A pilot operated valve makes use of stress differential throughout the valve to permit for increased circulation capacities with out the necessity of a giant solenoid coil. A minimal of 1 psi stress differential is required to permit the disc/piston/diaphragm to return to its regular place. That is THE key assertion, with no minimal stress drop throughout the valve, as soon as in operation the primary port won’t return to regular.

Why sizing is vital:

There has all the time been an inclination within the business to pick solenoid valves based mostly on line dimension. Nevertheless, as a result of stress drop required for correct operation, this coverage is dangerous and never beneficial.

In different phrases, if a liquid line solenoid valve is being chosen for a system having 5/8 inch OD liquid line, there’s a tendency to pick any valve having 5/8 ODF connections. For instance we’ve got 4 valve sequence with 5/8 OD connection sizes starting from 6.0 tons to 23 tons. If a capability of 15 tons is required, selecting solely based mostly on line dimension can result in detrimental situations.

1. Below-sizing and a staved evaporator.
2. Grossly outsized valve which won’t have the minimal 1 psi stress drop and its disc/piston/diaphragm will NOT return to its regular place.

Sizing:

Select solenoid valve based mostly on system capability with a minimal of 1 psi stress drop. Then select from obtainable connection sizes. If desired connection sizes are unavailable bushings and couplings can be utilized to adapt, which is able to NOT have an effect on valve efficiency.

Instance:

15 ton, r410a, Liquid Line Solenoid valve with 5/8 OD connections:

Choices:

1. E14, a bit of over 3 psi stress drop throughout the valve and has 5/8 OD choice
2. E19, a bit of over 1 psi stress drop throughout the valve solely 7/8 OD choice

Sporlan 30-10: click on right here.

By Henry Papa

Gross sales Engineer SE

Parker Hannifin Sporlan
(216) 225-0514

Observe HVAC Know It All on Instagram, Fb, YouTube and LinkedIn and LISTEN to the HVAC Know It All Podcast

Save 8% on purchases at TruTech Instruments with code knowitall (excluding Fluke and Flir merchandise)