Size Range:25 mm X 50 mm to 250 mm X 350 mm,Pressure Rating:150LBTo 2500LB pilot operated safety relief valve

Size Range:25 mm X 50 mm to 250 mm X 350 mm,Pressure Rating:150LBTo 2500LB pilot operated safety relief valve

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Model NO. Pilot safety valve

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Size Range:25 mm X 50 mm to 250 mm X 350 mm
Pressure Rating:150LBTo 2500LB
Face Connection:Raise Face (R.F), Flat Face (F.F), Ring Type Joint (RTJ)
Body Material refer:Carbon Steel / Alloy Steel / Stainless Steel
Trims:CF8 / 8M / SS 304 / 316 cet..
End Connection:Flange End & Butt Weld

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Pilot Safety Valve

SJ pilot‑operated safety relief valve delivers reliable over‑pressure protection for pressure vessels, pipelines and process systems. As a high‑performance pilot safety valve, it adopts external pilot control structure, features high set‑pressure accuracy, stable opening‑closing performance and excellent tight shut‑off.

Our pilot operated relief valve is engineered for demanding working conditions, available in multiple material options and flange classes. Suitable for oil & gas, chemical, power and industrial process applications. SJ strictly complies with international safety standards, providing dependable pressure relief solutions to safeguard your whole system.

Echnical specification

Design standard API520
Structural length API526
Flanged ends ASME B16.5
Test &inspection API527

Materials for main parts
NO.	Part Name	Valve Materials

1	Body	WCB	CF8	CF3M
2	Nozzle	304+STL	304+STL	316L+STL
3	Disc	304+STL	304+STL	316L+STL
4	Guide	304	304	316L
5	Spring	50CrVA	50CrVA	50CrVA
6	Bonnet	WCB	CF8	CF3M
7	Bellows	316L	316L	316L
8	Cap	WCB	CF8	CF3M

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

FAQ for Pilot Safety Valve

Q1: What are the main advantages of a pilot‑operated safety relief valve?

A: Pilot operated relief valve maintains high set‑pressure accuracy even with varying back‑pressure. It delivers tight sealing close to set pressure, suitable for large‑size and high‑capacity over‑pressure protection applications.

SJ Conclusion: SJ pilot safety valve performs stably under high back‑pressure working conditions.

Q2: What media can your pilot safety valve handle?

A: Our pilot‑operated safety relief valve works for steam, gas, oil and non‑corrosive liquid. For corrosive medium, we can configure stainless steel internal components. Please specify medium, temperature and pressure in your inquiry.

SJ Conclusion: SJ supports custom material configuration for different process media.

Q3: Can pilot operated relief valve be used instead of conventional spring safety valve?

A: It can replace conventional safety valves for most projects, especially where back‑pressure fluctuates. For simple, low‑cost general‑purpose systems, conventional spring‑loaded safety valves are still a cost‑effective option.

SJ Conclusion: SJ can recommend suitable valve type based on your actual system parameters.

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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.

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