RL/RA Stainless Steel Safety Relief Valve (5～280bar)

RL/RA Series Safety Pressure Relief Valve (1/4″~1/2″)

Uses
RA limits the pressure of liquids or gases. When valve inlet pressure exceeds the preset pressure level (set pressure), the valve opens and medium is discharged through the outlet, reducing inlet pressure. When system pressure drops below reseating pressure, the valve closes.

Features
● Rubber-sealed disc ensures effective gas sealing. Stellite-faced disc provides resistance to high-temperature and frequent cycling.
● Direct acting construction ensures flexible valve operation.
● Wide pressure setting: 5~280bar
Note: RL/RA series pressure relief valve is designed for general over-pressure protection and shall not be used as certified safety valves meeting pressure vessel design standards.

Technical Data

● Set pressure repeatability: ±5% (>10bar),±0.5bar(≤10bar)
● Min. re-seating pressure: 85%* set pressure Inlet
● Allowable Pressure: 350bar
● Working temperature: see "Application of Sealing Materials"
● Discharge flow rate: see "Pressure - Flow Rate Curve

● Casing material: 304/630 stainless steel

● Disc seal material: FPM, EPDM, stellite alloy (+350℃)

● Installation method: vertical installation (with valve cap on the top)

● Pressure Regulation Method: Tighten the regulating valve cap clockwise to increase the set pressure; loosen the regulating valve cap counterclockwise to decrease the set pressure.

Product Details
概要描述
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Commodity name: RL/RA Stainless Steel Safety Relief Valve (5～280bar)
Commodity ID: EG00780
小标题: RL/RA Series Safety Pressure Relief Valve (1/4″~1/2″)

○ Set pressure: 5～280bar; -50℃～+350℃ ○ Connection: R1/4, R1/2, 1/4NTP ○ Limits the pressure of liquids or gase. When valve inlet pressure exceeds set pressure, the valve opens, reducing inlet pressure

Ordering Information

Table of Technical Data [mm]

Type	Set pressure	DN	Model	Inlet A	Outlet B	C	D	E	FlowPath Diameter (mm)
RL Low pressure valve	5–46 bar	6	RL06-1/4NPTM-1/4NPT-F-SS	1/4NPT	1/4NPT	70	36	27	5.0
		6	RL06-R1/4M-R1/4-F-SS	R1/4	Rc1/4	70	35	27	5.0
		10	RL10-R1/2M-R1/2-F-SS	R1/2	Rc1/2	80	42	33	7.5
RA High pressure valve	42–150 bar	6	RA06-1/4NPTM-1/4NPT-F-SS	1/4NPT	1/4NPT	76	34	28	4.5
		6	RA06-R1/4M-R1/4-F-SS	R1/4	Rc1/4	76	33	28	4.5
		10	RA10-R1/2M-R1/2-F-SS	R1/2	Rc1/2	88	40	39	6.0
	140–280 bar	6	RA06-1/4NPTM-1/4NPT-P-SS	1/4NPT	1/4NPT	82	34	28	4.5
		6	RA06-R1/4M-R1/4-P-SS	R1/4	Rc1/4	82	33	28	4.5
		10	RA10-R1/2M-R1/2-P-SS	R1/2	Rc1/2	90	40	39	6.0

Application of Sealing Materials

Sealing& Disk Code	Valve Disk	Casing seal	Applicable operating conditions
F	FPM	FPM	Suitable for water, air, oil, weak acids, weak base; -25℃～+150℃
P	PU90	FPM	High-pressure resistant, for neutral media such as water, air, ordinary hydraulic oil.Temperature:-30℃～+80℃
E	EPDM	EPDM	For ammonia, hot water, alcohol, ketone, refrigerant:-45℃～+120℃
S	Stellite alloy	Metal-to-Metal Seal	High-temperature and organic solvent resistant, suitable for frequent switching under high pressure. Temperature:-50℃～+350℃

Table of Spring Selection

Spring code	Pressure	Valve Series
X	5–11 bar	Low-pressure valve RL
A	10–22 bar
B	21–46 bar
C	42–92 bar	High-pressure valve RA
D	90–150 bar
E	140–220 bar
F	200–280 bar

Pressure - Flow Rate Curve

Uses
RA limits the pressure of liquids or gases. When valve inlet pressure exceeds the preset pressure level (set pressure), the valve opens and medium is discharged through the outlet, reducing inlet pressure. When system pressure drops below reseating pressure, the valve closes.
Features
● Rubber-sealed disc ensures effective gas sealing. Stellite-faced disc provides resistance to high-temperature and frequent cycling.
● Direct acting construction ensures flexible valve operation.
● Wide pressure setting: 5~280bar
Note: RL/RA series pressure relief valve is designed for general over-pressure protection and shall not be used as certified safety valves meeting pressure vessel design standards.
Technical Data
● Set pressure repeatability: ±5% (>10bar),±0.5bar(≤10bar)
● Min. re-seating pressure: 85%* set pressure Inlet
● Allowable Pressure: 350bar
● Working temperature: see "Application of Sealing Materials"
● Discharge flow rate: see "Pressure - Flow Rate Curve
● Casing material: 304/630 stainless steel
● Disc seal material: FPM, EPDM, stellite alloy (+350℃)
● Installation method: vertical installation (with valve cap on the top)
● Pressure Regulation Method: Tighten the regulating valve cap clockwise to increase the set pressure; loosen the regulating valve cap counterclockwise to decrease the set pressure.

Ordering Information

Table of Technical Data [mm]

Type	Set pressure	DN	Model	Inlet A	Outlet B	C	D	E	FlowPath Diameter (mm)
RL Low pressure valve	5–46 bar	6	RL06-1/4NPTM-1/4NPT-F-SS	1/4NPT	1/4NPT	70	36	27	5.0
		6	RL06-R1/4M-R1/4-F-SS	R1/4	Rc1/4	70	35	27	5.0
		10	RL10-R1/2M-R1/2-F-SS	R1/2	Rc1/2	80	42	33	7.5
RA High pressure valve	42–150 bar	6	RA06-1/4NPTM-1/4NPT-F-SS	1/4NPT	1/4NPT	76	34	28	4.5
		6	RA06-R1/4M-R1/4-F-SS	R1/4	Rc1/4	76	33	28	4.5
		10	RA10-R1/2M-R1/2-F-SS	R1/2	Rc1/2	88	40	39	6.0
	140–280 bar	6	RA06-1/4NPTM-1/4NPT-P-SS	1/4NPT	1/4NPT	82	34	28	4.5
		6	RA06-R1/4M-R1/4-P-SS	R1/4	Rc1/4	82	33	28	4.5
		10	RA10-R1/2M-R1/2-P-SS	R1/2	Rc1/2	90	40	39	6.0

Application of Sealing Materials

Sealing& Disk Code	Valve Disk	Casing seal	Applicable operating conditions
F	FPM	FPM	Suitable for water, air, oil, weak acids, weak base; -25℃～+150℃
P	PU90	FPM	High-pressure resistant, for neutral media such as water, air, ordinary hydraulic oil.Temperature:-30℃～+80℃
E	EPDM	EPDM	For ammonia, hot water, alcohol, ketone, refrigerant:-45℃～+120℃
S	Stellite alloy	Metal-to-Metal Seal	High-temperature and organic solvent resistant, suitable for frequent switching under high pressure. Temperature:-50℃～+350℃

Table of Spring Selection

Spring code	Pressure	Valve Series
X	5–11 bar	Low-pressure valve RL
A	10–22 bar
B	21–46 bar
C	42–92 bar	High-pressure valve RA
D	90–150 bar
E	140–220 bar
F	200–280 bar