Circle Seal

500 SERIES RELIEF VALVES

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

68

520 B - 1M - 50

1/8

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

6

520 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

1

520 T1 - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

9

520 T1 - 1M - 50

1/8

50

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

1

520 T1 - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

5

D520 B - 1M - 10

1/8

10

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

10

D520 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

1

D520 B - 1M - 20

1/8

20

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

20

D520 B - 1M - 4

1/8

4

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

129

D520 B - 1M - 50

1/8

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

8

D520 B - 1M -50

1/8

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

2

524 B - 1M - 10 (6.0-13.9)

1/8

10

Pipe, Male - Exhaust to Atm.

Brass

Silicone

89

524 B - 1M -15

1/8

15

Pipe, Male - Exhaust to Atm.

Brass

Silicone

650

524 B - 1M - 30

1/8

30

Pipe, Male - Exhaust to Atm.

Brass

Silicone

1

532 B - 1M - 30

1/8

30

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

3

532 B - 1M - 150

1/8

150

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

1

532 B - 1M - 16.7

1/8

16.7

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

2

532 B - 1M - 7.2

1/8

7.2

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

2

532 T - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

1

532 T - 1M -4 (2.5-5.9)

1/8

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

13

532 T - 1M -5

1/8

5

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

135

532 T - 1M - 4

1/8

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

16

532 T - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

1

532 T1 - 1M - 1

1/8

1

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

D532 B - 1M - 2

1/8

2

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

20

D532 B - 1M - 23

1/8

23

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

1340

D532 T - 1M -20

1/8

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

1

D532 T - 1M -50(29-72)

1/8

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

5

D532 T1 - 1M -50

1/8

50

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

D532 T1 - 1M - 20

1/8

20

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

533 A - 1M - 20

1/8

20

Pipe, Male - Exhaust to Atm.

Aluminum

Neoprene

1

559 B - 1M - 1

1/8

1

Pipe, Male - Exhaust to Atm.

Brass

Buna N

2

559 B - 1M - 10

1/8

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

4

559 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

Buna N

2

559 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1202

559 B - 1M - 120

1/8

120

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 B - 1M - 90

1/8

90

Pipe, Male - Exhaust to Atm.

Brass

Buna N

3

D559 B - 1M -1 (0.5-2.4)

1/8

1

Pipe, Male - Exhaust to Atm.

Brass

Buna N

4

D559 B - 1M -20 (14-31)

1/8

20

Pipe, Male - Exhaust to Atm.

Brass

Buna N

135

D559 A - 1M - 10

1/8

10

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

9

D559 B - 1M - 100

1/8

100

Pipe, Male - Exhaust to Atm.

Brass

Buna N

202

D559 B - 1M - 20

1/8

20

Pipe, Male - Exhaust to Atm.

Brass

Buna N

81

D559 B - 1M - 32

1/8

32

Pipe, Male - Exhaust to Atm.

Brass

Buna N

3

D559 B - 1M - 5

1/8

5

Pipe, Male - Exhaust to Atm.

Brass

Buna N

5

D559 B - 1M - 50

1/8

50

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 T - 1M - 20

1/8

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

1

559 T - 1M - 30

1/8

30

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

176

559 T - 1M - 5

1/8

5

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

3

559 T - 1M - 50

1/8

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

1

562 B - 1M - 31

1/8

31

Pipe, Male - Exhaust to Atm.

Brass

Ethylene Propylene

222

D562 T1 - 1M -4

1/8

4

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Ethylene Propylene

1

D559 B - 1MM -125

125

Pipe, Male to Male

Brass

Buna N

5

559 B - 1 P2M - 65

1/8-1/4

65

Pipe, Female to Pipe, Male

Brass

Buna N

126

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 T - 2M - 100

1/4

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

1

520 T - 2M - 50 (31.1-72.9)

1/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

1

520 T - 2M - 100

1/4

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

6

520 T - 2M - 110

1/4

110

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

1

520 T - 2M -4

1/4

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

1

D520 T - 2M - 100

1/4

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

1

D520 T1- 2M - 100

1/4

100

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

1

532 B - 2M - 125

1/4

125

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

1

532 B - 2M - 20

1/4

20

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

2

532 T1- 2M -.5

1/4

0.5

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

D532 T - 2M -1(.5-2.4)

1/4

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

20

D532 T - 2M -10(6.0-13.9)

1/4

10

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

20

D532 T - 2M -50(31.1-72.9)

1/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

10

D532 T - 2M - 100

1/4

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

10

D532 T - 2M-20

1/4

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

9

D532 T - 2M-50

1/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

7

MD532 T1 - 2M -130

1/4

130

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

8

533 A - 2M - 95

1/4

95

Pipe, Male - Exhaust to Atm.

Aluminum

Neoprene

8

533 T - 2M - 60

1/4

60

Pipe, Male - Exhaust to Atm.

Brass

Neoprene

3

559 B - 2M - 10

1/4

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 B - 2M - 140

1/4

140

Pipe, Male - Exhaust to Atm.

Brass

Buna N

2

559 B - 2M - 125

1/4

125

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 T - 2M - 4

1/4

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

3

D559 A - 2M - 4

1/4

4

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

22

D559 B - 2M - 15

1/4

15

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

D559 N - 2M -100

1/4

100

Pipe, Male - Exhaust to Atm.

Naval Brass

Buna N

7

D559 T - 2M - 1 (0.5-2.4)

1/4

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

53

D559 T - 2M -10 (6-13.9)

1/4

10

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

34

D559 T - 2M -100(73-150)

1/4

100

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

8

D559 T - 2M -20 (14-31)

1/4

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

19

D559 T - 2M -4 (2.5-5.9)

1/4

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

47

D559 T - 2M -50 (29-72)

1/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

27

D559 T - 2M - 20

1/4

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

68

D559 T - 2M - 75

1/4

75

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

3

D559 T - 2M - 90

1/4

90

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

4

562 B - 2M - 1

1/4

1

Pipe, Male - Exhaust to Atm.

Brass

Ethylene Propylene

34

562 A - 2M - 28

1/4

28

Pipe, Male - Exhaust to Atm.

Aluminum

Ethylene Propylene

1

562 T - 2M - 7

1/4

7

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Ethylene Propylene

1

D562 N - 2M -113

1/4

113

Pipe, Male - Exhaust to Atm.

Naval Brass

Ethylene Propylene

15

520 T - 2MP- 100 (73-150)

1/4

100

Pipe, Male to Female

303 Stainless Steel

TFE Tefon

2

532 T - 2MP -10 (6-13.9)

1/4

10

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

45

532 T - 2MP -20 (14-31)

1/4

20

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

1

532 T - 2MP -50 (31.1-72.9)

1/4

50

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

4

532 T - 2MP - 100

1/4

100

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

8

559 T - 2MP - 75

1/4

75

Pipe, Male to Female

303 Stainless Steel

Buna N

1

580 B - 2MP- 25

1/4

25

Pipe, Male to Female

Brass

Teflon

1

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 T - 3M - 20

3/8

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

8

520 T - 3M - 20

3/8

20

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

1

D520 T - 3M - 20

3/8

20

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

2

D532 T1 - 3M - 10

3/8

10

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

559 B - 3M - 10

3/8

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

59

559 B - 3M - 100

3/8

100

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

D559 T - 3M -10 (6-13.9)

3/8

10

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

3

D559 T - 3M - 1

3/8

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

23

D559 T - 3M - 1

3/8

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

1

D559 T - 3M - 4

3/8

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

3

559 T - 3M - 1

3/8

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

112

520 B - 3MP - 1

3/8

1

Pipe, Male to Female

Brass

TFE Teflon

1

520 B - 3MP - 10

3/8

10

Pipe, Male to Female

Brass

TFE Teflon

7

520 B - 3MP - 100

3/8

100

Pipe, Male to Female

Brass

TFE Teflon

1

520 B - 3MP - 100

3/8

100

Pipe, Male to Female

Brass

TFE Teflon

2

520 B - 3MP - 20

3/8

20

Pipe, Male to Female

Brass

TFE Teflon

4

520 B - 3MP - 50

3/8

50

Pipe, Male to Female

Brass

TFE Teflon

1

524 B - 3MP - 150

3/8

150

Pipe, Male to Female

Brass

Silicone

2

532 T - 3MP- 10

3/8

10

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

37

532 T - 3MP- 4

3/8

4

Pipe, Male to Female

303 Stainless Steel

Viton® fluoroelastomer

4

559 B - 3MP - 10

3/8

10

Pipe, Male to Female

Brass

Buna N

1

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 B - 4M - 50 (31.1-72.9)

1/2

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

2

520 B - 4M - 80

1/2

80

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

1

520 B - 4M - 4

1/2

4

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

5

520 T - 4M - 4

1/2

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

9

520 T1 - 4M - 100 (73-150)

1/2

100

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

1

520 T1 - 4M - 140

1/2

140

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

TFE Teflon

3

532 A - 4M -20 (14-31)

1/2

20

Pipe, Male - Exhaust to Atm.

Aluminum

Viton® fluoroelastomer

1

532 B - 4M -4 (2.5-5.9)

1/2

4

Pipe, Male - Exhaust to Atm.

Brass

Viton® fluoroelastomer

6

532 T1 - 4M - 100

1/2

100

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

6

532 T1 - 4M - 20

1/2

20

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

3

532 T1 - 4M - 50

1/2

50

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Viton® fluoroelastomer

1

533 T - 4M - 1

1/2

1

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Neoprene

5

D559 A - 4D -45

1/4

45

Straight Thread MS 33656 w/o Cone Point to Exhaust to Atm.

Aluminum

Buna N

1

D559 A - 4D - 90

1/4

90

Straight Thread MS 33656 w/o Cone Point to Exhaust to Atm.

Aluminum

Buna N

9

D559 A - 4M - 10

1/2

10

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

4

D559 A - 4M - 100

1/2

100

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

6

D559 T - 4D - 1

1/4

1

Straight Thread MS 33656 w/o Cone Point to Exhaust to Atm.

303 Stainless Steel

Buna N

7

559 B - 4M - 4

1/2

4

Pipe, Male - Exhaust to Atm.

Brass

Buna N

292

559 B - 4M - 10

1/2

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 B - 4M - 125

1/2

125

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 B - 4M - 15

1/2

15

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1469

559 B - 4M - 50

1/2

50

Pipe, Male - Exhaust to Atm.

Brass

Buna N

1

559 T - 4M - 4

1/2

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

124

559 T1 - 4M - 50

1/2

50

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Buna N

5

559 T1 - 4M - 4

1/2

4

Pipe, Male - Exhaust to Atm.

316 Stainless Steel

Buna N

1

532 B - 4MP - 40

1/2

40

Pipe, Male to Female

Brass

Viton® fluoroelastomer

222

532 B - 4MP - 10

1/2

10

Pipe, Male to Female

Brass

Viton® fluoroelastomer

1

559 A - 4MP- 20

1/2

20

Pipe, Male to Female

Aluminum

Buna N

10

559 A - 4MP- 25

1/2

20

Pipe, Male to Female

Aluminum

Buna N

2

559 T - 4MP -100 (73-150)

1/2

100

Pipe, Male to Female

303 Stainless Steel

Buna N

1

559 A - 4MP - 1

1/2

1

Pipe, Male to Female

Aluminum

Buna N

7

559 B - 4MP - 12

1/2

12

Pipe, Male to Female

Brass

Buna N

1

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 B - 6M - 10 (6-13.9)

3/4

10

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

1

520 B - 6M - 50

3/4

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

3

D520 T - 6M - 50

3/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

TFE Teflon

16

532 T - 6M - 50

3/4

50

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Viton® fluoroelastomer

1

559 B - 6M - 1 (0.5-2.4)

3/4

1

Pipe, Male - Exhaust to Atm.

Brass

Buna N

24

559 T - 6M - 4

3/4

4

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

2

559 A - 6M - 20

3/4

20

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

1

559 A - 6M - 4

3/4

4

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

3

559 A - 6M - 50

3/4

50

Pipe, Male - Exhaust to Atm.

Aluminum

Buna N

3

559 B - 6M - 1

3/4

1

Pipe, Male - Exhaust to Atm.

Brass

Buna N

142

559 B - 6M - 10

3/4

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

46

559 B - 6M - 10

3/4

10

Pipe, Male - Exhaust to Atm.

Brass

Buna N

100

D559 T - 6M - 10

3/4

10

Pipe, Male - Exhaust to Atm.

303 Stainless Steel

Buna N

1

520 T - 6MP - 50

3/4

50

Pipe, Male to Female

303 Stainless Steel

TFE Teflon

1

559 A - 6MP- 10

3/4

10

Pipe, Male to Female

Aluminum

Buna N

13

559 A - 6MP - 4

3/4

4

Pipe, Male to Female

Aluminum

Buna N

4

559 B - 6MP - 10

3/4

10

Pipe, Male to Female

Brass

Buna N

20

559 T - 6MP - 100

3/4

100

Pipe, Male to Female

303 Stainless Steel

Buna N

4

559 T - 6MP - 75

3/4

75

Pipe, Male to Female

303 Stainless Steel

Buna N

48

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

520 B - 8M - 4 (2.5-5.9)

1

4

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

4

520 B - 8M - 50(31.1- 72.9)

1

50

Pipe, Male - Exhaust to Atm.

Brass

TFE Teflon

9

K520 T - 8MP - 15

1

15

Pipe, Male to Female

303 Stainless Steel

TFE Teflon

1

Part Number

Size

Set Pressure
PSI

Connection Type

Body Material

Seal Material

In Stock
Qty

D559 A -16 D -4

1

4

Straight Thread MS 33656 w/o Cone Point to Exhaust to Atm.

Aluminum

Buna N

3