Yukon Oil Furnace User Manual download pdf (Page 27)

A Guide to Home Heating Oil Tanks

Automatic Valves

Automatic valves (which include anti-siphon valves) are also used, but not required on most

home-heating oil tank installations. The automatic valve is usually installed in addition to a

manual valve. These valves will not allow fuel to ﬂow free from a tank if piping develops a leak.

Fusible Link / Anti-siphon Valve

A fusible link valve is an optional safety valve designed to shut off the fuel supply in the event

of a ﬁre. Typically, a fusible link valve is installed at the furnace.

Anti-siphon Valve

It is advantageous to have an automatic valve located at the tank when the tank or oil level is

above the height of the oil burning appliance - for example when a tank is installed inside an

attached garage with the furnace in the basement. The following clauses from the B139 Code

provide the requirements for the use of an anti-siphon valve:

6.4.5 c When the total capacity of tanks connected to one supply line exceeds

2500 litres (550 gal), all connections for the transfer of oil to and from the

consuming appliance shall be situated at the top of the tank, transfer shall be by

pump only, and means shall be provided to prevent siphoning, except where oil

types #5 and #6 are used.

A suitable, automatically operated device, designed to shut off the fuel supply in case of

breakage of the supply piping, shall be installed when more than one burner is supplied from

a single pump set.

Note: This requirement provides protection if the supply piping between an upstream

pump and the burner is broken.

These valves operate with the use of a diaphragm that requires a minimum suction draw

from the pump at the appliance before fuel is allowed to pass through it.

Without a sufﬁcient vacuum draw from the pump, oil cannot free ﬂow from the tank by the

siphoning action of a broken line. These valves are commonly referred to in the oil industry as

an “oil safety valve” or OSV, although the term is actually a trademark of Webster Industries.

This is an example of an automatic shut off valve.An example of an anti-siphon valve

for a top of tank fuel hook-up.

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 47 48

No comments

Yukon Oil Furnace User Manual Page 27