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Safety Valve Series

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Product drawing»

Structural drawing»

A41Y Spring-loaded Slightly Opening Safety Valve

product drawing

Overview

The A41Y spring-loaded micro-opening safety valve is a spring-loaded direct-acting safety valve with carbide sealing. Its valve disc opening height ranges from 1/40 to 1/20 of the flow passage diameter (micro-opening type). When the system pressure exceeds the preset safety value, the valve automatically opens to release pressure, and it closes automatically after the pressure returns to normal. Its "Y"-shaped carbide sealing surface possesses extremely high hardness, high temperature resistance, and erosion resistance, specifically designed to protect liquid or gas systems that require stable working pressure, small discharge capacity, and are subject to corrosive or abrasive media.

Features:

1. The sealing surface between the hard alloy sealing ("Y" type) valve disc and the valve seat is surfaced with hard alloys such as Stellite, which boasts high hardness, excellent wear resistance, high temperature resistance, and corrosion resistance, ensuring a long service life.
2. The spring-loaded micro-opening valve disc has a small opening height, limited discharge area, moderate discharge capacity, and rapid and smooth opening and closing action, making it suitable for liquid media or applications where controlled discharge is required.
3. Stable pressure and good repeatability: The use of precision coil springs ensures that the set pressure (opening pressure) is adjustable and stable, with a small pressure difference between opening and closing (re-seating pressure) and high repeatability.
4. Compact structure, wide applicability, mostly flange connection, short structural length, easy to install. Suitable for various liquid or gas media with working temperature ≤300℃.
5. Online adjustment available (for some models) Some models are equipped with adjustment screws and lock nuts, allowing on-site adjustment of the set pressure within a certain range, facilitating precise setting according to system requirements.

Dimensions & constructral diagram

Parts List

Part name	Water, steam, oil products	Corrosive media	Corrosive media	Corrosive media
Seat	2Cr13	CF8	CF8M	CF3M
Body	WCB	CF8	CF8M	CF3M
Adjusting ring	2Cr13	304SS	316SS	316L
Disc	2Cr13	304SS	316SS	316L
Guide sleeve	2Cr13	304SS	316SS	316L
Bonnet	WCB	CF8	CF8M	CF3M
Spring	50CrVa	50CrVa coated with TEFLON	50CrVa coated with TEFLON	50CrVa coated with TEFLON
Stem	2Cr13	2Cr13	316SS	316L
Adjusting screw	45# steel	2Cr13	2Cr13	2Cr13
Protective cover	ZG200	ZG200	ZG200	ZG200
Sealing surface material	Surfacing Co-based cemented carbide	Surfacing Co-based cemented carbide	Surfacing Co-based cemented carbide	Surfacing Co-based cemented carbide

Performance Specification Sheet

Model	Cast steel type
Caliper range	DN20 ~ DN200
Application temperature	≤350°C
Application media	Water, Steam and oil

Outline dimension table

Nominal Pressure (MPa)	Nominal Diameter	do	DN	L	L1	h
1.0MPa / 2.5MPa	20	15	20	100	85	276
	35	20	25	100	85	276
	32	25	32	115	100	285
	40	32	40	120	110	292
	50	40	50	135	120	370
	65	50	65	140	130	375
	80	65	80	160	135	373
	100	80	100	170	160	513
	125	100	125	190	190	560
	150	125	150	205	195	570
	200	150	200	240	230	717
	250	200	250	350	320	940
4.0MPa	300	250	300	350	320	980
	20	15	20	100	85	276
	35	20	25	100	85	276
	32	25	32	115	100	285
6.0MPa	40	32	40	120	110	292
	50	40	50	135	120	370
	65	50	65	140	130	375
	80	65	80	160	135	373
	100	80	100	170	160	513
	125	100	125	190	190	560
	150	125	150	205	195	570
	200	150	200	240	230	717
	250	200	250	320	940
	300	250	300	350	320	980
	20	15	20	100	95	268
	35	20	25	100	95	268
	32	25	32	115	105	279
	40	32	40	125	115	330
	50	40	50	160	125	360
	65	50	65	175	160	503
	80	65	80	175	160	498
	100	80	100	190	180	530
	150	100	150	280	260	657
10.0MPa	20	15	20	100	95	268
	35	20	25	100	95	268
	32	25	32	115	105	279
	40	32	40	135	115	330
	50	40	50	160	125	360
	65	50	65	175	160	503
	80	65	80	175	160	498
	100	80	100	190	180	530
	150	100	150	280	260	657

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