LESER Product Overview

Click on one of the
valves for details

High Performance
API
Compact Performance

Compact Performance

Threaded and flanged safety valves with compact dimensions for economical protection of small and midsized capacites. Many orifice diameters, seals and connections offer a very wide area of application.
High Efficiency
Modulate Action
Clean Service
Critical Service
Best Availability
S&R Valves

Compact design with high capacity relative to valve size
Large selection of possible connections and seals for different operating conditions
Quick delivery (2 - 4 weeks from the factory or next day from local warehouse)
Space-saving horizontal installation possible
Single Trim (identical internal parts for steam/gas/liquids) allows economical maintenance
Longer lifespan of optional bellows through integrated shielding

Nominal Diameter at Inlet	DN 15 - DN 40 \| 3/8" - 2"
Orifice	D - F \| D - F
Actual Orifice Diameter d0	6 mm - 17,5 mm \| 0,236 in - 0,689 in
Actual Orifice Area A0	28,3 mm² - 241 mm² \| 0,044 in² - 0,374 in²
Pressure	0,1 bar - 850 bar \| 1,5 psig - 12.328 psig
Temperature (iaw DIN EN)	-270 °C to 550 °C \| -454 °F to 1.022 °F
Body Material	1.4104, 1.4404, 0.7043, 1.0619, 1.4408 \| SA 479 430, SA 479 316L, Ductile Gr. 60-40-18, SA 216 WCB, SA 351 CF8M
Valve Connection	Threads iaw DIN ISO 228-1, DIN ISO 7-1 / BS 21, ANSI / ASME B1.20.1. Flange iaw DIN EN 1092-1 / DIN 2501.
Bellows Material (optional)	Stainless steel, Elastomer (EPDM)
Load Type	Spring loaded

Type 437 Metal to metal or sealing plate
G 3/8 - 1 (NPT 1/2" - 1")
Type 438 O-ring disc
G 3/8 - 1 (NPT 1/2" - 1")
Type 439 Vulcanized soft seal disc
G 3/8 - 1 (NPT 1/2" - 1")
Type 459 Metal to metal or sealing plate
1/2" - 2" (1/2" - 2")
Type 459 HDD Metal to metal or sealing plate Massive construction for high pressure
1/2" - 2" (1/2" - 2")
Type 462 O-ring disc
1/2" - 2" (1/2" - 2")
Type 462 HDD O-ring disc Massive construction for high pressure
1/2" - 2" (1/2" - 2")

Compact Performance