Safety valve · Full, instantaneous opening

ALPER safety valve

Full opening ALPER full-opening safety valve with lever and 90° piped discharge

Safety valve with full, instantaneous opening (A.I.T.) and 90° piped discharge. It detects overpressure in tanks, boilers, or pipelines and discharges the excess fluid without auxiliary power, in bronze or stainless steel and up to 280 °C.

Inlet¼″ to 4″ threaded · DN15–DN100 flanged
OpeningFull, instantaneous (A.I.T.)
Maximum pressurePN25 metal seat · PN16 PTFE
Max. temperature280 °C stainless · 240 °C bronze
MaterialRG5 bronze or 316L stainless
DischargePiped at 90°

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Questions about the figure or the set pressure? Call 933 720 888 or email valfonta@valfonta.com.

Bench-tested with compressed air
Supplied set to the pressure you specify
Numbered main components
¼″ drain hole for condensate

What the ALPER is used for

The ALPER is a safety valve with full, instantaneous opening for liquids, compressed air, inert gases, and steam. When the pressure exceeds the set value, it opens and discharges the excess fluid; once the pressure returns to normal, it closes again. It has a ¼″ female threaded hole for draining and removing condensate. More background in our article on pressure relief devices.

ALPER technical specifications

Type	Safety valve with full, instantaneous opening (A.I.T.)
Discharge	Piped at 90°
Connections	Inlet: male BSP thread or DIN flanges · Outlet: female BSP thread (flanges on request)
Materials	Bonnet: RG5 bronze or CF-8M stainless · Base: RG5 bronze or AISI 316L stainless · Plug: PTFE, RG5 bronze, or AISI 316L stainless
Maximum pressure	PN25 with metal seat · PN16 with PTFE seat
Maximum temperature	280 °C in stainless steel · 240 °C in bronze
Fluids	Liquids, compressed air, inert gases, and steam
Test	On a test bench with pressurized air at room temperature; supplied set to the requested pressure
Certification	Catalog with PED 97/23/EC certificate; CE marking depending on figure (see table). Material, heat, and output certificates on request
Other options	AISI 302/316 stainless spring · Viton, NBR, or EPDM seat · ANSI inlet flange · NPT thread

Available figures

Figures (lever / sealed)	Bonnet · base · plug	Inlet	BSP outlet	CE certificate
375 / 376	CF-8M stainless · 316L stainless · 316L stainless	Thread ¼″–1¼″	¾″ and 1¼″	Yes
377 / 378	CF-8M stainless · 316L stainless · 316L stainless	Flanges DN15–DN32	¾″ and 1¼″	No
385 / 386	Bronze · 316L stainless · 316L stainless	Thread 3/8″–4″	½″–4″	Yes
387 / 388	Bronze · 316L stainless · 316L stainless	Flanges DN15–DN100	¾″–4″	No
395 / 396	Bronze · bronze · PTFE or bronze	Thread 3/8″–4″	½″–4″	Yes
397 / 398	Bronze · bronze · PTFE or bronze	Flanges DN15–DN100	¾″–4″	On request

ALPER technical documentation

PDF

ALPER safety valve catalogPDF · 3 pages · features, figures, and sizes

Frequently asked questions about the ALPER

Which figure do I need?

It depends on the material, the connection, and the actuation. Odd-numbered figures (375, 377, 385, 387, 395, and 397) have a lever, and even-numbered ones are sealed. Figures 375 to 378 are stainless steel, 385 to 388 combine a bronze bonnet with a stainless base, and 395 to 398 are bronze, with a PTFE or bronze plug.

What maximum pressure does it accept?

PN25 with metal seat and PN16 with PTFE seat. The maximum temperature is 280 °C in stainless steel and 240 °C in bronze.

Is it supplied preset?

Yes. All are tested on a bench with pressurized air at room temperature and supplied set to the pressure specified by the customer.