Van an toàn Leser Type 441

Full lift safety valves open rapidly within an overpressure of 5% to the full design lift. They are used in particular for vapours and gases, in applications where the maximum mass flow has to be discharged rapidly. LESER type 441 is suitable for almost any industrial application, and are worldwide one of the best selling spring-loaded flange type safety valves.

There are four series available:
Type 441 ANSI: Cast steel construction with ANSI flanges. Two body materials: stainless steel and cast steel. Center to face length in accordance with API 526, greater discharge capacity than standard API valves.
Type 441/442 DIN: Cast construction with DIN flanges. Two body materials: stainless steel and carbon steel.
Type 441/442 “XXL”: Robust welded construction with DIN or ANSI flanges. Welding procedures to EN and ASME standards. Two body materials: stainless steel and carbon steel.

Type	Bonnet	Flange ANSI B 16.5		Flange		Main Characteristic
		PR	NPS	N	DN
441 ANSI	closed	#150…#300	1″…8″	–	–	Cast Construction, semi nozzle
442 ANSI	open
441 DIN	closed	–	–	16…40	20…200
442 DIN	open
441 “XXL”	closed	#150…#300	8″…16″	10…25	200…400	Welded construction, full nozzle
442 “XXL”	open

Code của dòng van an toàn leser

Leser – Type 441, 442 DIN (DN 20 – 200)

Valve size: 20×32 20×40 25×40 32×50 40×65 50×80 65×100 80×125 d0 [mm]: 18 18 23 29 37 46 60 74 Body material: 0.6025 (Cast iron) Bonnet: closed H2 4411.4372 4411.4382 4411.4392 4411.4402 4411.4412 4411.4422 4411.4432 H3 4411.4373 4411.4383 4411.4393 4411.4403 4411.4413 4411.4423 4411.4433 H4 4411.4374 4411.4384 4411.4394 4411.4404 4411.4414 4411.4424 4411.4434 open H3 4421.4375 4421.4385 4421.4395 4421.4405 4421.4415 4421.4425 4421.4435 Body material: 0.7043 (Ductile Gr. 60-40-18) Bonnet: closed H2 4415.7382 4415.7392 4415.7402 4415.7412 4415.7422 4415.7432 H3 4415.7383 4415.7393 4415.7403 4415.7413 4415.7423 4415.7433 H4 4415.7384 4415.7394 4415.7404 4415.7414 4415.7424 4415.7434 open H3 4425.7385 4425.7395 4425.7405 4425.7415 4425.7425 4425.7435 Body material: 1.0619 (SA 216 WCB) Bonnet: closed H2 4412.4502 4412.4512 4412.4522 4412.4532 4412.4542 4412.4552 4412.4562 H3 4412.4503 4412.4513 4412.4523 4412.4533 4412.4543 4412.4553 4412.4563 H4 4412.4504 4412.4514 4412.4524 4412.4534 4412.4544 4412.4554 4412.4564 open H3 4422.4505 4422.4515 4422.4525 4422.4535 4422.4545 4422.4555 4422.4565 Body material: 1.4408 (CF8M) Bonnet: closed H2 4414.4642 4414.4652 4414.4662 4414.4672 4414.4682 4414.4692 H4 4414.4644 4414.4654 4414.4664 4414.4674 4414.4684 4414.4694

Product Overview

• API Series (Type 526)
• Clean Service (Type 483, 484, 485, 488)
• Compact Performance (Type 437, 459/462)
• High Performance (Type 441/442)
• Critical Service (Type 447)
• Change Over Valves (Type 310, 311)