Product Overview | 1595A Shutoff Valve
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. —Standard 23 mesh* strainer on the inlet of the valve body housing. —Fast cycling operation. —Maximum operating pressure 7 psi. —Standard " 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.
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"
Capacity in cfh of natural gas at pressure drop of 1"wc sp. gr. = 0.65 at 60°F
Valve
Pipe size Capacity
designation inches
in cfh
1595A-01 1595A-0 1595A-1 1595A-2 1595A-3 1595A-4
1/2 3/4
325 390
1
1260 1550 1700 1780
11/4 11/2
2
* System designer to determine if 23 mesh is sufficient for application.
Bulletin 1595A Page 2
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