Pressure Range:ASME Class 600LB to 2500LB Size;40 – 200mm (1.5 – 8 inches)steam safety relief valve mounting surface for in-situ electronic valve testing

price

Model NO. steam safety relief valve

Delivery

Minimum Order 0

Supply Ability

Country of Origin

Stock Time Day

Pressure Range:ASME Class 600 LBto 2500LB
Connection:Flanged or Butt-weld
Size range & dimensions:40 – 200mm (1.5 – 8 inches)
MATERIALS:Carbon steel, various carbon & chrome moly steels austenitic stainless steels
TEMPERATURE RANGE:Saturated steam up to 649ºC (1200°F)
Pre-drilled yoke mounting surface for in-situ electronic valve testing

Quantity

Steam safety relief valve

How Dose steam safety relief valve Working?

Pressure in steam systems and related equipment is controlled by pressure reducing valve (PRV) stations and control elements that monitor pressure, return condensate from steam lines to boilers at the NIH Central Utility Plant, and separate steam and condensate at different pressures. Pressure in steam lines For many pressure vessels, pressure can rise above the rated design pressure for reasons including control instrument failure and pressure surges

Actual application scenario

The basic components of a spring-loaded"conventional"SRV consist of a vertical steam inlet, a horizontal discharge, and an internal disc that is held closed by a spring within the bonnet. Steam is discharged through the valve disc when it is lifted from its seat by steam and enters the valve port above the setsteam pressure, which the system operating pressure is selected by the designer by adjusting the spring. Set pressuresare greater than the normal operating pressure of the system to avoid unnecessary discharges, but they should never exceed the system's maximum allowable operating pressure. The valve releases steam through an outlet pipe that is flanged or threaded to the discharge port. The outlet pipe is bent at an elbow, from which the steam escapes to a vent

Steam Safety Relief Valve vs Pressure Relief Valve
Aspect	Steam Safety Relief Valve	Pressure Relief Valve (PRV)
Fluid Type	Compressible fluids: steam, gas, vapor	Compressible or incompressible fluids, depending on its subclass
Opening Behavior	Pop action: rapid full lift at set pressure, nearly full discharge	Depends on subclass: safety valve = pop action; relief valve = proportional (gradual) opening as pressure rises
Primary Function	Emergency discharge to prevent boiler/vessel rupture from overpressure — the"last line of defense"	Prevent system pressure from exceeding set value, e.g. liquid thermal expansion or blocked pumps
Reseating / Blowdown	Often has adjustable blowdown rings; reseats with a significant pressure drop (blowdown ~4–10%)	Relief valve usually lacks blowdown rings; reseats smoothly as pressure drops
Typical Applications	Steam boilers (ASME Sec I), gas pressure vessels, air receivers, steam piping	Hydraulic systems, liquid storage tanks, pump protection, process systems, liquid vessels (Sec VIII)
Applicable Standards	ASME Section I (boilers), Section VIII (gas vessels), API 520/521	ASME Section VIII, API 520 (liquid service), covering all subclasses
Throttling / Adjustability	Not for throttling; strictly a safety protection device	Safety device; relief valve allows proportional discharge (not continuous pressure regulation)

The following figure shows a typical function curve for a spring loaded safety valve. The operating set pressure of a 526 Series API Safety Valve with Adjusting Ring and Initial Sound Venting is defined. It is important to understand that the operating pressure of the protected equipment should be kept below the pressure at which the valve is re-seated. Most manufacturers, codes and standards recommend a difference between 4 - 6% between the re-seating pressure and the operating pressure to allow the valve to properly re-seat and achieve a good seat tightness again.

Dimension&Specification
Type	Size(in)	ANSI Flange Rating		Orifice Dime.	Center-to-Face Dimensions		Type	Size(in)	ANSI Flange Rating		Orifice Dime.	Center-to-Face Dimensions
Type	Size(in)	Inlet	Outlet	do	L	L1	Type	Size(in)	Inlet	Outlet	do	L	L1
SJO-150C	¾D1	150	150	9.5	96	92	SJO-600C	¾D1	600	150	9.5	96	92
	1D2	150	150	9.5	115	105		1D2	600	150	9.5	115	105
	1E2	150	150	12.7	115	105		1E2	600	150	12.7	115	105
	1½F2	150	150	16.0	121	124		1½F2	600	150	16.0	152	124
	1½G3	150	150	20.3	121	124		1½G3	600	150	20.3	152	124
	1½H3	150	150	25.4	124	130		2H3	600	150	25.4	162	154
	2J3	150	150	32.5	124	136		3J4	600	150	32.5	181	184
	3K4	150	150	38.9	162	156		3K4	600	150	38.9	181	184
	3L4	150	150	48.5	165	156		4L6	600	150	48.5	203	179
	4M6	150	150	54.5	184	178		4M6	600	150	54.5	203	178
	4N6	150	150	59.7	210	197		4N6	600	150	59.7	222	197
	4P6	150	150	72.4	229	181		4P6	600	150	72.4	254	225
	6Q8	150	150	95.3	241	240		6Q8	600	150	95.3	241	240
	6R8	150	150	114.6	241	240		6R10	600	150	114.6	267	240
	8T10	150	150	146	279	276
SJO-300C	¾D1	300	150	9.5	96	92	SJO-900C	¾D1	900	300	9.5	95	120
	1D2	300	150	9.5	115	105		1½D2	900	300	9.5	140	105
	1E2	300	150	12.7	115	105		1½E2	900	300	12.7	140	105
	1½F2	300	150	16.0	121	124		1½F3	900	300	16.0	165	124
	1½G3	300	150	20.3	121	124		1½G3	900	300	20.3	165	124
	1½H3	300	150	25.4	124	130		2H3	900	150	25.4	162	154
	2J3	300	150	32.5	124	136		3J4	900	150	32.5	181	184
	3K4	300	150	38.9	162	156		3K6	900	150	38.9	216	198
	3L4	300	150	48.5	165	156		4L6	900	150	48.5	222	197
	4M6	300	150	54.5	184	178		4M6	900	150	54.5	222	197
	4N6	300	150	59.7	210	197		4N6	900	150	59.7	222	197
	4P6	300	150	72.4	229	181		4P6	900	150	72.4	254	225
	6Q8	300	150	95.3	241	240
	6R8	300	150	114.6	241	240
	8T10	300	150	146	279	276
SJO-1500C	¾D1	1500	300	9.5	95	120	SJO-2500C	¾D1	2500	300	9.5	95	120
	1½D2	1500	300	9.5	140	105		1½D3	2500	300	9.5	178	140
	1½E2	1500	300	12.7	140	105		1½E3	2500	300	12.7	178	140
	1½F3	1500	300	16.0	165	124
	2G3	1500	300	20.3	171	156
	2H3	1500	300	25.4	162	154
	3J4	1500	300	32.5	181	184
	3K6	1500	300	38.9	216	197
	4L6	1500	150	48.5	222	197

Data for reference only. Contact our technicians for more details.

Steam Safety Relief Valve FAQ

FAQ 1

Q: What is the main difference between steam safety relief valve and ordinary pressure relief valve?

A: Steam safety relief valve features pop‑action full‑lift opening, specially designed for compressible media like steam and gas. Ordinary PRV usually opens proportionally and works for both liquid and gas. Steam safety relief valve has adjustable blowdown ring to meet boiler ASME standard requirements.

SJ Conclusion: Choose steam safety relief valve for boiler & steam piping service, do not use general‑purpose PRV as replacement.

FAQ 2

Q: Can I use this safety relief valve for liquid medium?

A: Not recommended. This valve is optimized for compressible steam/gas with pop‑action lift. When handling liquid media, unstable chattering, leakage and short service life may occur. Dedicated liquid relief valve shall be adopted for liquid working conditions.

SJ Conclusion: Steam safety relief valve applies for steam/gas only, select liquid‑type PRV for fluid service.

FAQ 3

Q: Can set pressure be adjusted on‑site? What should we notice?

A: Set pressure can be adjusted within the valve pressure range. Adjustment shall be performed under no‑pressure condition. After adjustment, the cap must be locked and sealed. Over‑range adjustment will cause safety risk and void warranty.

SJ Conclusion: Adjust within rated pressure range; lock cap after setting; forbidden to adjust under system pressure.

Recommend Products

Message Content

Country

Fax

WS&BOTIM

Company Name

Name

Pressure Range

Material Grades

End Connections

Operation

Size Range

File

You can only upload 1 attachments at most
Supported formats: PDF,JPG,PNG,EXCEL,WORD,STP,IGS,DWG,DXF,PDF,STEP
The size of the uploaded file should not exceed 10MB

SEND INQUIRY >

Talk To Our Team

Have a question for our team? Get in touch with the details below.

BOTIM

+39 389 949 9067

PHONE

+39 389 949 9067

andant@sanjingvalve.com

+39 389 949 9067

CONTACT INFORMATION

WORKING HOURS

Sitemap

Contact Us

Head Office Address: Viale del Lavoro.19,20003 Casorezzo Ml. Italy Testing zone
Address:Via S. Giovanni Bosco S.n.c.70020 – Poggiorsini (BA) – ITALY

EMAIL: andant@sanjingvalve.com
PHONE: +39 389 949 9067
WHATSAPP: +39 389 949 9067

Branch Office Address: Dongou Industrial Zone, Oubei Street, Yongjia Wenzhou City, Zhejiang Province China Testing zone 2 Address:No. 205, Linwu Road, Sanqiao Industrial Zone

What exactly is the relationship between SANJING Valve Company and SJ Valvole S.R.L.?

SANJING Valve Company is the main manufacturing company, responsible for valve production, quality control, testing, and technical support. SJ Valvole S.R.L. serves as SANJING’s Italian office, supporting its business development, customer communication, and commercial activities in Italy and the European market.

Integrated Manufacturing and European Service

The two operations work together to provide customers with coordinated manufacturing and local market support:

Manufacturing & Quality Control: SANJING Valve Company manages valve manufacturing, inspection, testing, and quality control at its production facilities.

European Market Support: SJ Valvole S.R.L. supports customer communication, commercial coordination, and business development in Italy and other European markets.

Project Coordination: Customer requirements, technical specifications, documentation, production, and delivery can be coordinated between the Italian office and the manufacturing team.

VACUUM VALVE

Safety Relief Valves

Control Valve

Level Gauge

Pressure Range:ASME Class 600LB to 2500LB Size;40 – 200mm (1.5 – 8 inches)steam safety relief valve​ mounting surface for in-situ electronic valve testing

Steam safety relief valve​

How Dose steam safety relief valve​ Working?

Actual application scenario

Recommend Products

Pressure Range:ASME Class 600LB to 2500LB Size;40 – 200mm (1.5 – 8 inches)steam safety relief valve mounting surface for in-situ electronic valve testing

Steam safety relief valve

How Dose steam safety relief valve Working?