MINT-0305-XX
166 Keystone Drive
Rev. B
Montgomeryville, PA 18936
Phone: (215) 641-2700
Fax: (215) 641-2714
Page 1 of 2
Operating Instructions for Matheson 6295 Series Excess Flow Valves
1.
General
1.1
This excess flow valve is designed to provide automatic shut off of gas flow
under failure conditions which cause a flow in excess of the valve rating.
1.2
A provision for higher purge flows is provided for purging without nuisance shut
off.
1.3
The valve is a ¼ turn valve, providing two positions - AUTO and OPEN
(RESET). The valve handle is provided with cutouts which line up with a label
on the valve bonnet.
2. Installation
2.1
Only personnel trained in pipe or VCR fitting connections should install the EFV.
2.2
After installation, leak checking is required to prevent leaks of dangerous gases.
3.
Operation
3.1
If purging with an inert gas is desired, turn the handle so that the cutouts line up
with OPEN (RESET) on the bonnet label. In this position, the valve is locked
open, and will not shut off regardless of the flow rate. See Figure 1.
NOTE: DO NOT OPERATE THIS VALVE IN THE OPEN (RESET) POSITION WITH
ANY DANGEROUS GASES. THIS POSITION IS PROVIDED FOR PURGING
WITH INERT GASES, OR FOR RESETTING THE VALVE AFTER A SHUTOFF
DUE TO AN EXCESS FLOW CONDITION. FAILURE TO RUN IN THE AUTO
POSITION MAY RESULT IN A HAZARDOUS CONDITION.
