VALVE PROVING DEVICE
The Valve Proving Device option checks that both safety shutoff
valves in a Compact Fuel Train are fully closed before a system
startup and after shutdown when wired and interlocked with a
suitable flame monitoring relay as shown in the wiring diagrams
on Sheet 1597A-5. The Valve Proving Device will halt the start-up
sequence to a burner if it detects an open safety shutoff valve,
thus preventing ignition under dangerous conditions. For IRI
requirements, the Valve Proving Device can be used in
lieu of a
vent line.
APPROVALS
—
UL listed
—
FM approved
—
NFPA 86-2003 compliant
—
IRI approvable (when ordered as 1595A-V with Valve Proving
Device in lieu of Vent Line)
—
AGA ANSI Z21.21/CGA 6.5: "Commercial/Industrial Safety
Shutoff Valves"
Valve
Pipe size Capacity
designation
inches
in cfh
1595A-01
1/2
325
1595A-0
3/4 390
1595A-1
1
1260
1595A-2
11/4 1550
1595A-3
11/2 1700
1595A-4
2
1780
*
System designer to determine if 23 mesh is sufficient for application.
DESCRIPTION
The 1595A Double Shut-off Valve combines two safety shut-
off valves in one housing. This reduces piping costs and space
requirements.
APPLICATION
The 1595A Double Shutoff Valve is recommended for industrial
and commercial process heating and boiler applications that
require two safety shutoff valves in series, with visual indication
and FM valve seal overtravel proof-of-closure switch. They can
be used with air, natural gas, propane and other non-corrosive
gases.
Pre-packaged compact gastrain systems are easily created
without additional piping by adding surface mounted devices
such as high and low gas pressure swtiches, valve proving
system or pressure regulator (see Bulletin 1597A).
FEATURES
All valve components are designed and built to ISO 9001
standards to ensure safe, reliable operation
.
—
Two actuators with independent valve operation.
—
Standard visual position indicator on first valve.
—
Standard valve seal overtravel FM proof-of-closure switch with
visual indication on second valve.
—
Test nipples downstream of each valve for a permanent and
ready means to make tightness checks.
—
housing.
—
Fast cycling operation.
—
Maximum operating pressure 7 psi.
—
Standard 1/2" to 2" NPT threaded flanges.
BENEFITS
—
Compact design saves installation space.
—
Dual solenoids, integral flanges, and side taps reduce piping
time and costs.
—
When used with 1597A prepackaged fuel train, connecting
pipes for surface-mount devices are eliminated.
—
Slow-opening provides smoother light-off.
—
Optimized internal contours provide a low pressure drop.
—
Flow adjustment allows performance specific throttling.
Bulletin 1595A
Page 2
Product Overview | 1595A Shutoff Valve
Capacity in cfh of natural gas
at pressure drop of 1"wc
sp. gr. = 0.65 at 60°F
