Spring micro opening closed safety valve A41H/Y

Brief Introduction to the Structure of Spring Micro opening Closed Pressure Relief Valve

1. The spring micro opening closed pressure relief valve has the characteristics of simple structure, good sealing performance, accurate opening pressure, large discharge capacity, small reseating pressure difference, and easy adjustment.

2. Nozzle type valve seat: The valve seat is a displacement nozzle type valve seat. When steam flows through the outlet of the valve seat, it reaches the speed of sound and has a high emission coefficient. The sealing surface of the valve seat is welded with cobalt chromium tungsten hard alloy, which is wear-resistant and erosion resistant, and has a long service life.

3. Thermoelastic valve disc: The valve disc is designed as a thermoelastic structure, which utilizes its small deformation under medium pressure to improve sealing ability and overcome the forward leakage phenomenon of the pressure relief valve near the set pressure under medium pressure. The sealing surface of the valve disc adopts advanced laser quenching technology, which improves hardness, wear resistance, and impact resistance.

4. Adjusting the nut: By adjusting the adjusting nut and adjusting the compression of the spring, the valve can easily and quickly obtain accurate set pressure.

5. Back pressure adjustment sleeve: an auxiliary mechanism for adjusting the back pressure of the valve disc. By adjusting the back pressure adjustment sleeve, a suitable reseating pressure difference can be obtained. When increasing, reduce the back pressure of the valve. When lowering, increase the back pressure of the valve.

Product drawing

Product drawing.png

Product dimensions

model	DN	d0	D	K	g	g1	b	f	f1	Z-Фd	DN'	D1	K1	g2	g'	b1	f'	f1'	Z1-Фd1	L	L1	≈H
A41H-16C A41Y-16P/R	20	15	105	75		55	16	2		4-14	20	105	75	55		16	2		4-14	100	85	276
	25	20	115	85		65	16	2		4-14	25	115	85	65		16	2		4-14	100	85	276
	32	25	140	100		78	18	2		4-18	32	140	100	78		18	2		4-18	115	100	285
	40	32	150	110		85	18	3		4-18	40	150	110	85		18	3		4-18	120	110	292
	50	40	165	125		100	20	3		4-18	50	165	125	100		20	3		4-18	135	120	370
	65	50	185	145		120	20	3		4-18	65	185	145	120		20	3		4-18	140	130	375
	80	65	200	160		135	20	3		8-18	80	200	160	135		20	3		8-18	160	135	373
	100	80	220	180		155	22	3		8-18	100	220	180	155		22	3		8-18	170	160	513
	125	100	250	210		185	22	3		8-18	125	250	210	185		22	3		8-18	190	190	560
	150	125	285	240		210	24	3		8-23	150	285	240	210		24	3		8-23	205	195	570
	200	150	340	295		265	26	3		12-23	200	340	295	265		26	3		12-23	240	230	717
	250	200	405	355		320	30	3		12-26	250	405	355	320		30	3		12-26	350	320	940
	300	250	460	410		375	30	4		12-26	300	460	410	375		30	4		12-26	350	320	980
A41H-25C A41Y-25P/R	20	15	105	75		55	16	2		4-14	20	105	75	55		16	2		4-14	100	85	276
	25	20	115	85		65	16	2		4-14	25	115	85	65		16	2		4-14	100	85	276
	32	25	140	100		78	18	2		4-18	32	140	100	78		18	2		4-18	115	100	285
	40	32	150	110		85	18	3		4-18	40	150	110	85		18	3		4-18	120	110	292
	50	40	165	125		100	20	3		4-18	50	165	125	100		20	3		4-18	135	120	370
	65	50	185	145		120	22	3		8-18	65	185	145	120		20	3		4-18	140	130	375
	80	65	200	160		135	24	3		8-18	80	200	160	135		20	3		8-18	160	135	373
	100	80	230	190		160	24	3		8-23	100	220	180	155		20	3		8-18	170	160	513
	125	100	270	220		188	28	3		8-26	125	250	210	185		22	3		8-18	190	190	560
	150	125	300	250		218	30	3		8-26	150	285	240	210		24	3		8-23	205	195	570
	200	150	360	310		278	34	3		12-26	200	340	295	265		26	3		12-23	240	230	717
	250	200	425	370		332	36	3		12-30	250	405	355	320		30	3		12-26	350	320	940
	300	250	485	430		390	40	4		16-30	300	460	410	375		30	4		12-26	350	320	980
A41H-40C A41Y-40P/R	20	15	105	75	51	55	16	2	4	4-14	20	105	75	55		16	2		4-14	100	85	276
	25	20	115	85	58	65	16	2	4	4-14	25	115	85	65		16	2		4-14	100	85	276
	32	25	140	100	66	78	18	2	4	4-18	32	140	100	78		18	2		4-18	115	100	285
	40	32	150	110	76	85	18	3	4	4-18	40	150	110	85		18	3		4-18	120	110	292
	50	40	165	125	88	100	20	3	4	4-18	50	165	125	100		20	3		4-18	135	120	370
	65	50	185	145	110	120	22	3	4	8-18	65	185	145	120		20	3		4-18	140	130	375
	80	65	200	160	121	135	22	3	4	8-18	80	200	160	135		20	3		8-18	160	135	373
	100	80	235	190	150	160	24	3	4.5	8-23	100	220	180	155		22	3		8-18	170	160	513
	125	100	270	220	176	188	28	3	4.5	8-26	125	250	210	185		22	3		8-18	190	190	560
	150	125	300	250	204	218	30	3	4.5	8-26	150	285	240	210		24	3		8-23	205	195	570
	200	150	375	320	260	282	38	3	4.5	12-30	200	340	295	265		26	3		12-23	240	230	717
	250	200	450	385	313	345	42	3	4.5	12-34	250	405	355	320		30	3		12-26	350	320	940
	300	250	515	450	364	408	46	4	4.5	16-34	300	460	410	375		30	4		12-26	350	320	980
A41H-64C A41Y-64 C/P/R	20	15	130	90	51	68	20	2	4	4-18	20	105	75	55	51	16	2	4	4-14	100	95	268
	25	20	140	100	58	78	22	2	4	4-18	25	115	85	65	58	16	2	4	4-14	100	95	268
	32	25	155	110	66	82	24	2	4	4-23	32	140	100	78	66	18	2	4	4-18	115	105	279
	40	32	170	125	76	95	24	3	4	4-23	40	150	110	85	76	18	3	4	4-18	135	115	330
	50	40	180	135	88	105	26	3	4	4-23	50	165	125	100	88	20	3	4	4-18	160	125	360
	65	50	205	160	110	130	28	3	4	8-23	65	185	145	120	110	22	3	4	8-18	175	160	503
	80	65	215	170	121	140	30	3	4	8-23	80	200	160	135	121	22	3	4	8-18	175	160	498
	100	80	250	200	150	168	32	3	4.5	8-26	100	235	190	160	150	24	3	4.5	8-23	190	180	530
	150	100	345	280	204	240	38	3	4.5	8-34	150	300	250	218	204	30	3	4.5	8-26	280	260	657
A41H-100C A41Y-100 C/P/R	20	15	130	90	51	68	22	2	4	4-18	20	105	75	55	51	16	2	4	4-14	100	95	268
	25	20	140	100	58	78	24	2	4	4-18	25	115	85	65	58	16	2	4	4-14	100	95	268
	32	25	155	110	66	82	24	2	4	4-23	32	140	100	78	66	18	2	4	4-18	115	105	279
	40	32	170	125	76	95	26	3	4	4-23	40	150	110	85	76	18	3	4	4-18	135	115	330
	50	40	195	145	88	112	28	3	4	4-26	50	165	125	100	88	20	3	4	4-18	160	125	360
	65	50	220	170	110	138	32	3	4	8-26	65	185	145	120	110	22	3	4	8-18	175	160	503
	80	65	230	180	121	148	34	3	4	8-26	80	200	160	135	121	22	3	4	8-18	175	160	498
	100	80	265	210	150	172	38	3	4.5	8-30	100	235	190	160	150	24	3	4.5	8-23	190	180	530
	150	100	355	290	204	250	46	3	4.5	12-34	150	300	250	218	204	30	3	4.5	8-26	280	260	657

Technical Documentation

1.execution standard GB/T 12243-2021

2.Structural length standard：GB/T12221-2005

3.Flange Standard：GB/T9113.1-2000

4.Test Standard：GB/T13927-2022

Product Parts List

serial number	name	A41H-C/A41Y-Cmaterial	A41Y-Pmaterial	A41Y-Rmaterial
1	valve body	WCB	CF8	CF8M
2	valve seat	20Cr13/304	304	316
3	Adjustment Circle	20Cr13/304	304	316
4	valve disc	20Cr13/304	304	316
5	guide bushing	20Cr13/304	304	316
6	valve cover	25#	25#	25#
7	spring	50CrVA	50CrVACovering fluoroplastic	50CrVACovering fluoroplastic
8	valve stem	20Cr13	20Cr13	20Cr13
9	adjusting screw	45#	20Cr13	20Cr13
10	protective cover	ZG200-400	ZG200-400	ZG200-400
11	sealing surface	Welding D507	Welding Co based Hard Alloy

Installation instructions for spring micro opening closed safety valve

1. The safety valve must be installed vertically and directly on the joint of the container or pipeline. The inner diameter of the joint should not be less than the inlet diameter of the safety valve.

2. The outlet of the safety valve must be equipped with an appropriate expansion joint to prevent the thermal expansion of the discharge pipe from causing undue thermal stress to the safety valve. The inner diameter of the discharge pipe should be larger than the outlet diameter of the valve, and the length should be as short as possible to avoid bends. The weight of the discharge pipe and expansion joint should not act on the safety valve, but should be fixed on the building. The distance between the centerline of the discharge pipe and the centerline of the valve body should be as short as possible. Each safety valve should be equipped with a separate discharge pipe.

3. The outlet of the muffler should have sufficient area to prevent back pressure from affecting the discharge capacity of the valve.

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