02 Vent Valve S/ST T Bleeder 1/4" M.NPT

05 Valves » 11 Vent Valves

Marshall Excelsior is the only manufacturer in the industry that offers three types of vent valves - Low Emission, Self-Cleaning Low Emission, and Standard Vent Valves. All the vent valves below are designed to minimize loss of product while allowing the operator to effectively bleed down connections and detect liquid levels while filling containers. Vent valves provide an effective means to verify valves have closed in the transfer system when installed into the downstream auxiliary port on the Marshall Excelsior globe and angle valves. Opening the vent valve until liquid or vapor stops venting indicates it is safe to disconnect.


All brass versions have knurled stems that completely unscrew from the valve making the stems replaceable. The stainless steel version has a t-handle stem that is non-removable. The Low Emission Vent Valve and the Self-Cleaning Low Emission Vent Valve reduce emissions by 70 Percent during normal container filling operations.

The Self-Cleaning Low Emission Vent Valve cleans out the orifi ce hole each time it is operated. The hole is cleaned out with a #54 orifice drill that reams the valve’s orifice hole each time the adjusting screw is loosened or tightened, eliminating nuisance orifi ce clogging. The reduced venting emissions is achieved by forcing product to pass between the #54 orifice hole and the fl utes of the captured self-cleaning apparatus. The selfcleaning replacement screw (MEJ401SC) is compatible with all existing standard vent valve bodies allowing a standard vent valve to be converted into a self-cleaning low emission vent valve without reinstalling the valve body. The Standard Vent Valve has a #54 orifi ce with no self-cleaning apparatus. The Low Emission Vent Valve has a #72 orifice.

Vent Valve Features

• 70% emission reduction with our Self-Cleaning and Low Emission vent valves
• 1/4” MNPT Connection
• Available with dip tubes. See fixed maximum liquid level gauges

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