IHSUNG TECH
HIGHCONTRL & HIGHTECHNOLOGY
ly-Lok
ReliF Vallve
IHSUNG TECH.CO.,LTD.
Relief Valve
CONTENTS
▣ Proportional Relief Valves shown
▣ Technical Data
……… 2
……… 3 ~ 6
Pressure-Temperature Ratings
Back Pressure
Set Pressure and Resealing Pressure
Materials of Construction
Flow Data at 70°F (20°C) – Air & Water
Dimensions
2
Relief Valve
▣ Proportional Relief Valves shown
Plug
Cap
Spring
Label
Lock nut
Lock wire hole
Stem seal
Stem
O-ring
End connections
Relief valve shown
Features
■ Service up to 250 psig (17.2 bar)
■ One spring for the full set pressure range
■ 1/2 in. and 12 mm end connections—IHRV series
Operation
relief valves OPEN when system pressure reaches the set pressure and CLOSE when system
pressure falls below the set pressure.
■ High-pressure —select and install the spring that covers the required set pressure
; apply the matching label to the cap.
■ Low-pressure IHRV series—the spring is already installed.
※For valves not actuated for a period of time, initial relief pressure may be higher than the
set pressure.
3
Relief Valve
▣ Technical Data
Pressure-Temperature Ratings
Item
Relief valve
Working Pressure at 70°F (20°C)
250 psig (17.2 bar)
Set Pressure
10 ~ 250 psig (0.68 ~ 17.2 bar)
Outlet Pressure
250 psig (17.2 bar)
Seal Material
Fluorocarbon FKM
Temperature, °F (°C)
–10 (–23)
Neoprene
Ethylene
propylene
Maximum Set Pressure, psig (bar)
–40 (–40)
–30 (–34)
Buna N
-
-
-
-0 (-17)
-10 (12)
25 (-4)
30 (-1)
50 (10)
150 (65)
250
(17.2)
250
(17.2)
250
(17.2)
250
(17.2)
200 (93)
250 (121)
275 (135)
300 (148)
-
➀ The pressure-temperature ratings are based upon laboratory testing to ensure that the cracking pressure
does not
deviate by more than 20 % from the initial room-temperature set pressure.
➁ Outlet pressure should not exceed inlet pressure.
Back Pressure
System back pressure increases the set pressure of the valve.
To compensate, multiply the back pressure by 0.8 and subtract the result from the desired
set pressure.
Use the result to pre-set the valve while back pressure is equal to atmospheric pressure.
Example:
Desired set pressure is 120 psig. System back pressure is 40 psig.
Step 1. Multiply back pressure by 0.8.
40 psig * 0.8 = 32 psig.
Step 2. Subtract result from desired set pressure.
120 psig – 32 psig = 88 psig.
Step 3. Pre-set proportional relief valve to 88 psig.
4
Relief Valve
Set Pressure and Resealing Pressure
■ Set pressure is the upstream pressure at which the first indication of flow occurs.
Set pressure of each valve after initial relief is repeatable within ± 5 % at room temperature.
■ Resealing pressure is the upstream pressure at which there is no indication of flow. Resealing
pressure is always lower than set pressure.
Testing
Every R series proportional relief valve is tested for set and resealing performance.
Test Set Pressure
psig (bar)
Minimum Resealing
Pressure as a Percentage
of Set Pressure, %
10 to 20 (0.68 to 1.3)
50
175 to 250 (12.0 to 17.2)
94
Item
Relief valve
Materials of Construction
1 Plug
2 Cap
12 O-ring
3 Label
13 Insert
4 Lock nut
14 Seat retainer
15 Quad seal
5 Spring
16 Body
6 Spring support
7 Bonnet
8 Quad seal
9 O-ring
10 Retainer
11 Stem
5
Relief Valve
Flow Data at 70°F (20°C) – Air & Water
6
Relief Valve
Dimensions
➀ Dimensions are for reference only and are subject to change.
End Connections
Inlet
Outlet
Ordering
Number
Dimensions , in. (mm)
A
B
C
38.7
37.3
104.6
46.7
114.0
35.7
103.0
32.2
99.5
35.7
103.0
1/4“ Iy-Lok
1/4“ Iy-Lok
IHRV-04T
6mm Iy-Lok
6mm Iy-Lok
IHRV-06M
8mm Iy-Lok
8mm Iy-Lok
IHRV-08M
1/2” Iy-Lok
1/2” Iy-Lok
IHRV-08T
12mm Iy-Lok
12mm Iy-Lok
IHRV-12M
1/2” Male NPT
1/2” Iy-Lok
IHRV-08NMT
1/2” Male NPT
12mm Iy-Lok
IHRV-04NMT
1/4” Male NPT
1/4” Female NPT
IHRV-04NMF
30.0
3/8” Male NPT
3/8” Female NPT
IHRV-04NMF
34.5
1/2” Male NPT
1/2” Female NPT
IHRV-04NMF
38.0
46.7
1.IHSUNG RELIF VALVE
Ordering system
2.SIZE
04: 1/4”
08: 1/2”
IHRV-08 N M
1
2
3
4
T
5
3.PIPE THREAD
N: NPT
R: PT
4,5. END TYPE
M:MALE
F:FEMALE
T:TUBE O.D
7