Spring Loaded · ISO 4126 · Over-Pressure Protection

Conventional Type Safety Valves for Pressure Equipment and Pipeline Protection

150LB~2500LB, sizes 1″ to 10″ (DN25~250mm), available in WCB, CF8, CF8M, CF3M, Monel, and Hastelloy C per ISO4126, API RP520, JIS8210, and DIN3320.

Overview

Coventional type safety valve is the ideal over pressure protection device for pressure equipment, pressure vessel and pipeline. When the medium pressure increases and exceeds the allowed pressure, the safety valve will open automatically to discharge fully, protecting the medium pressure from being increased continually. When the medium pressure reduces to the set up pressure, the relief valve will close timely, making sure the equipment or the pipeline work safely.

The bonnet of full sealed safety valve is sealed, preventing the dust or foreign matters from invading into the bonnet and preventing the toxic or inflammable mediums overflow from the bonnet. Open type safety valve is good for reducing the temperature in the bonnet for its bonnet is open, which is mainly applicable to steam pipeline and vessel. The coventional type safety valve with radiator is mainly applicable to the conditions of mediums with temperature 300℃ – 570℃.

The spring loaded safety valve with lever can be open with lever when the medium pressure reaches more than 75% of discharge pressure. Flowspec Luokai can produce the coventional type safety valve in accordance with ISO4126, API RP520, JIS8210, DIN3320.

1. Features

Safety valves are mostly precision castings, compact structure, nice appearance, bright surface.
Valve seat and body are separated type, seat is easy processing, and sealing surface is easy to grind into mirror surface, making sure on the valve sealing, convenient for disassembly and repair.
Reasonable designed disc holder is well-matched with nozzle ring, convenient for adjusting, which makes the safety valve discharge quickly, back to seat timely, achieving in on-off pressure difference.
Both valve seat and disc are Stellite welded, wear-resistance, erosion resistance, extending the valve service life.
Back pressure balance safety valve adopts high quality bellows, avoiding the effect of back pressure against discharge pressure.
The spring is processed with 2 x 24 hours constant temperature treatment, making sure the spring keep stable rigidity and correct lift in working condition.
Taking serious pressure testing on the valve body and seat, making sure that the safety valve work safely and reliably.

2. Technical Specifications

Class rating: 150LB~2500LB
Size: 1″ ~ 10″ (DN25~250mm)
Materials: steel A216 WCB, stainless steel A351 CF8, CF8M, CF3M, Monel, Hast. C
Set pressure tolerance: ≤±3%
Overpressure: ≤10%
Blowdown: ≤15%

3. Standards

Design & manufacturing: ISO4126, API RP520, JIS8210, DIN3320
Flanged ends: ANSI B16.5a, JIS B2212-2216, DIN2546-2551
Face to face: API 526, JIS B2001, DIN3202
Inspection & testing: API 527

4. Applications

Applicable medium: steam, air, gas, LPG, oil, corrosive liquids
Applicable temperature: -29℃~+350℃
Applicable fields: boiler, oil & gas field, steam equipment, oil vessel, pressure vessel

Safety Valve — Dimensions D Orifice — Safety Valve — D Orifice Dimensions

Safety Valve — E/F/G/H Orifice Dimensions

Dimensions — D Orifice (φ10, 71mm²)

Size	No.	Inlet (Lb)	Outlet (Lb)	Back Press. 38℃ (MPa)	L	L1	X	H A42	H A48	H A44	Wt (kg)
1 D2	0101	150	150	1.96 / 1.58	114.5	105.0	39	340	375	395	17
1 D2	0301	300	150	1.96 / 1.58	114.5	105.0	39	340	375	395	18
1 D2	03a01	300	150	1.96 / 1.58	114.5	105.0	39	340	375	395	18
1 D2	0601	600	150	1.96 / 1.58	114.5	105.0	39	340	375	395	19
1½ D2	0903	900	300	4.13 / 3.45	139.5	105.0	51	415	425	445	32
1½ D2	1503	1500	300	4.13 / 3.45	139.5	105.0	51	415	425	445	34
1½ D3	2503	2500	300	5.10 / 3.45	178.0	139.5	64	475	495	500	36

Dimensions — E Orifice (φ13, 126mm²)

Size	No.	Inlet (Lb)	Outlet (Lb)	Back Press. 38℃ (MPa)	L	L1	X	H A42	H A48	H A44	Wt (kg)
1 E 2	0101	150	150	1.96 / 1.58	114.5	105.0	39	340	375	395	17
1 E 2	0301	300	150	1.96 / 1.58	114.5	105.0	39	340	375	395	18
1 E 2	03a01	300	150	1.96 / 1.58	114.5	105.0	39	340	375	395	18
1 E 2	0601	600	150	1.96 / 1.58	114.5	105.0	39	340	375	395	19
1½ E 2	0903	900	300	4.13 / 3.45	139.5	105.0	51	415	425	445	32
1½ E 2	1503	1500	300	4.13 / 3.45	139.5	105.0	51	415	425	445	34
1½ E 3	2503	2500	300	5.10 / 3.45	178.0	139.5	64	475	495	500	36

Dimensions — F Orifice (φ16, 198mm²)

Size	No.	Inlet (Lb)	Outlet (Lb)	Back Press. 38℃ (MPa)	L	L1	X	H A42	H A48	H A44	Wt (kg)
1½ F2	0101	150	150	1.96 / 1.58	120.5	124.0	44	340	375	395	20
1½ F2	0301	300	150	1.96 / 1.58	120.5	124.0	44	340	375	395	23
1½ F2	03a01	300	150	1.96 / 1.58	152.5	124.0	44	400	430	440	29
1½ F2	0601	600	150	1.96 / 1.58	152.5	124.0	44	400	430	440	29
1½ F3	0903	900	300	5.10 / 3.45	165.0	124.0	51	475	495	500	35
1½ F3	1503	1500	300	5.10 / 3.45	165.0	124.0	51	475	495	500	37
1½ F3	2503	2500	300	5.10 / 3.45	178.0	139.5	64	475	495	500	42
1½ F2½	0903*	900	300	5.10 / 3.45	152.5	124.0	51	450	470	480	35
1½ F2½	1503*	1500	300	5.10 / 3.45	152.5	124.0	51	450	470	480	37

Dimensions — G Orifice (φ20, 324mm²)

Size	No.	Inlet (Lb)	Outlet (Lb)	Back Press. 38℃ (MPa)	L	L1	X	H A42	H A48	H A44	Wt (kg)
1½ G3	0101	150	150	1.96 / 1.58	120.5	124.0	44	377	394	415	24
1½ G3	0301	300	150	1.96 / 1.58	120.5	124.0	44	377	394	415	26
1½ G3	03a01	300	150	1.96 / 1.58	152.5	124.0	44	416	445	455	34
1½ G3	0601	600	150	1.96 / 1.58	152.5	124.0	44	416	445	455	34
1½ G3	0903	900	300	5.10 / 3.24	165.0	124.0	51	475	495	500	38
2 G 3	1503	1500	300	5.10 / 3.24	171.5	155.5	70	475	495	500	42
2 G 3	2503	2500	300	5.10 / 3.24	171.5	155.5	70	475	495	500	46
1½ G 2½	0101	150	150	1.96 / 1.58	120.5	124.0	44	385	420	430	26
1½ G 2½	0301	300	150	1.96 / 1.58	120.5	124.0	44	385	420	430	26
1½ G 2½	03a01	300	150	1.96 / 1.58	152.5	124.0	44	375	416	420	34
1½ G 2½	0601	600	150	1.96 / 1.58	152.5	124.0	44	375	416	420	34
1½ G 2½	0903	900	300	5.10 / 3.24	152.5	124.0	51	450	470	480	38

Dimensions — H Orifice (φ26, 506mm²)

Size	No.	Inlet (Lb)	Outlet (Lb)	Back Press. 38℃ (MPa)	L	L1	X	H A42	H A48	H A44	Wt (kg)
1½ H3	0101	150	150	1.96 / 1.58	124.0	130.0	43	377	394	415	26
1½ H3	0301	300	150	1.96 / 1.58	124.0	130.0	43	377	394	415	28
2 H 3	03a01	300	150	1.96 / 1.58	124.0	130.0	46	377	394	415	31
2 H 3	0601	600	150	1.96 / 1.58	162.0	154.0	46	420	450	460	38
2 H 3	0901	900	150	1.96 / 1.58	162.0	154.0	59	–	–	–	–