Product Overview
Va l v e s
Pe r f o r m a n c e
Model Opening Pressure ASME Rating
Number psig (kg/cm
2
) BTUH (K-Calories)
2 5 0 - 3 / 4 I N - 1 5 1 5 ( 1 ) 5 1 5 , 0 0 0 ( 2 , 0 4 3 )
2 5 0 - 3 / 4 I N - 3 0 3 0 ( 2 . 1 ) 7 9 0 , 0 0 0 ( 3 , 1 3 4 )
2 5 0 - 3 / 4 I N - 3 6 3 6 ( 2 . 5 ) 9 0 0 , 0 0 0 ( 3 , 5 7 1 )
2 5 0 - 3 / 4 I N - 4 0 4 0 ( 2 . 8 ) 9 7 3 , 0 0 0 ( 3 , 8 6 1 )
2 5 0 - 3 / 4 I N - 4 5 4 5 ( 3 . 2 ) 1 , 0 6 5 , 0 0 0 ( 4 , 2 2 6 )
2 5 0 - 3 / 4 I N - 5 0 5 0 ( 3 . 5 ) 1 , 1 6 0 , 0 0 0 ( 4 , 6 0 3 )
2 5 0 - 3 / 4 I N - 6 0 6 0 ( 4 . 2 ) 1 , 2 5 2 , 0 0 0 ( 4 , 9 6 8 )
2 5 0 - 3 / 4 I N - 7 5 7 5 ( 5 . 3 ) 1 , 6 1 5 , 0 0 0 ( 6 , 4 0 9 )
2 5 0 - 3 / 4 I N - 1 0 0 1 0 0 ( 7 ) 2 , 0 7 5 , 0 0 0 ( 8 , 2 3 4 )
2 5 0 - 3 / 4 I N - 1 2 5 1 2 5 ( 8 . 8 ) 2 , 5 3 5 , 0 0 0 ( 1 1 , 0 5 9 )
2 5 0 - 1 I N - 1 5 1 5 ( 1 ) 7 7 0 , 0 0 0 ( 3 , 0 5 6 )
2 5 0 - 1 I N - 3 0 3 0 ( 2 . 1 ) 1 , 1 7 0 , 0 0 0 ( 4 , 6 4 2 )
2 5 0 - 1 I N - 3 6 3 6 ( 2 . 5 ) 1 , 3 3 0 , 0 0 0 ( 5 , 2 7 8 )
2 5 0 - 1 I N - 4 0 4 0 ( 2 . 8 ) 1 , 4 3 7 , 0 0 0 ( 5 , 7 0 2 )
2 5 0 - 1 I N - 4 5 4 5 ( 3 . 2 ) 1 , 5 7 5 , 0 0 0 ( 6 , 2 5 0 )
2 5 0 - 1 I N - 5 0 5 0 ( 3 . 5 ) 1,710, 000 ( 6 , 7 8 6 )
2 5 0 - 1 I N - 6 5 6 5 ( 4 . 6 ) 2 , 1 1 0 , 0 0 0 ( 8 , 3 7 3 )
2 5 0 - 1 I N - 7 5 7 5 ( 5 . 3 ) 2 , 3 8 5 , 0 0 0 ( 9 , 4 6 4 )
2 5 0 - 1 I N - 1 0 0 1 0 0 ( 7 ) 3 , 0 6 0 , 0 0 0 ( 1 2 , 1 4 2 )
2 5 0 - 1 I N - 1 2 5 1 2 5 ( 8 . 8 ) 3 , 7 3 5 , 0 0 0 ( 1 4 , 8 2 1 )
2 5 0 - 2 I N - 3 0 3 0 ( 2 . 1 ) 4 , 1 0 0 , 0 0 0 ( 1 6 , 2 7 0 )
2 5 0 - 2 I N - 3 6 3 6 ( 2 . 5 ) 4 , 6 0 0 , 0 0 0 ( 1 8 , 2 5 4 )
2 5 0 - 2 I N - 4 0 4 0 ( 2 . 8 ) 5 , 0 0 0 , 0 0 0 ( 1 9 , 8 4 1 )
2 5 0 - 2 I N - 4 5 4 5 ( 3 . 2 ) 5 , 5 0 0 , 0 0 0 ( 2 1 , 8 2 5 )
2 5 0 - 2 I N - 5 0 5 0 ( 3 . 5 ) 5 , 9 0 0 , 0 0 0 ( 2 3 , 4 1 2 )
O r dering Info r m a t i o n
Model Part Weight
Number Number Description lbs. (kg)
2 5 0 - 3 / 4 I N - 1 5 1 8 1 2 2 0 Relief Valve
3
⁄
4
NPT, 15 psi (1 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 3 0 1 8 1 2 2 5 Relief Valve
3
⁄
4
NPT, 30 psi (2.1 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 3 6 1 8 1 3 2 5 Relief Valve
3
⁄
4
NPT, 36 psi (2.5 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 4 0 1 8 1 4 0 5 Relief Valve
3
⁄
4
NPT, 40 psi (2.8 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 4 5 1 8 1 4 2 5 Relief Valve
3
⁄
4
NPT, 45 psi (3.2 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 5 0 1 8 1 5 2 5 Relief Valve
3
⁄
4
NPT, 50 psi (3.5 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 6 0 1 8 1 9 0 5 Relief Valve
3
⁄
4
NPT, 60 psi (4.2 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 7 5 1 8 1 6 2 5 Relief Valve
3
⁄
4
NPT, 75 psi (5.3 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 1 0 0 1 8 1 7 2 5 Relief Valve
3
⁄
4
NPT, 100 psi (7 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 3 / 4 I N - 1 2 5 1 8 1 8 2 5 Relief Valve
3
⁄
4
NPT, 125 psi (8.8 kg/cm
2
) 1 . 3 ( . 6 )
2 5 0 - 1 I N - 1 5 1 8 1 9 2 0 Relief Valve 1 NPT, 15 psi (1 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 3 0 1 8 1 9 2 5 Relief Valve 1 NPT, 30 psi (2.1 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 3 6 1 8 2 0 2 5 Relief Valve 1 NPT, 36 psi (2.5 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 4 0 1 8 2 0 3 0 Relief Valve 1 NPT, 40 psi (2.8 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 4 5 1 8 2 1 2 5 Relief Valve 1 NPT, 45 psi (3.2 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 5 0 1 8 2 2 2 5 Relief Valve 1 NPT, 50 psi (3.5 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 6 5 1 8 2 2 3 5 Relief Valve 1 NPT, 65 psi (4.6 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 7 5 1 8 2 3 2 5 Relief Valve 1 NPT, 75 psi (5.3 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 1 0 0 1 8 2 4 2 5 Relief Valve 1 NPT, 100 psi (7 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 1 I N - 1 2 5 1 8 2 5 2 5 Relief Valve 1 NPT, 125 psi (8.8 kg/cm
2
) 1 . 5 ( . 7 )
2 5 0 - 2 I N - 3 0 1 8 3 0 2 5 Relief Valve 2 NPT, 30 psi (2.1 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
2 5 0 - 2 I N - 3 6 1 8 3 1 2 5 Relief Valve 2 NPT, 36 psi (2.5 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
2 5 0 - 2 I N - 4 0 1 8 3 1 7 5 Relief Valve 2 NPT, 40 psi (2.8 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
2 5 0 - 2 I N - 4 5 1 8 3 2 2 5 Relief Valve 2 NPT, 45 psi (3.2 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
2 5 0 - 2 I N - 5 0 1 8 3 3 2 5 Relief Valve 2 NPT, 50 psi (3.5 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
Series 250
Pressure Relief Valves
Pe r fo r m a n c e
Model Opening Pressure ASME Rating
Number psig (kg/cm
2
) BTUH (K-Calories)
260-1 1/2IN-30 3 0 ( 2 . 1 ) 3 , 3 0 0 , 0 0 0 ( 1 3 , 0 9 5 )
260-1 1/2IN-36 3 6 ( 2 . 5 ) 3 , 8 0 0 , 0 0 0 ( 1 5 , 0 7 9 )
260-1 1/2IN-40 4 0 ( 2 . 8 ) 4 , 1 0 0 , 0 0 0 ( 1 6 , 2 7 0 )
260-1 1/2IN-45 4 5 ( 3 . 2 ) 4 , 5 0 0 , 0 0 0 ( 1 7 , 8 5 7 )
260-1 1/2IN-50 5 0 ( 3 . 5 ) 4 , 9 0 0 , 0 0 0 ( 1 9 , 4 4 4 )
O r dering Info r m a t i o n
Model Part Weight
Number Number Description lbs. (kg)
260-1 1/2IN-30 1 8 2 6 2 5 Relief Valve 1
1
⁄
2
NPT, 30 psi (2.1 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
260-1 1/2IN-36 1 8 2 7 2 5 Relief Valve 1
1
⁄
2
NPT, 36 psi (2.5 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
260-1 1/2IN-40 1 8 2 7 3 0 Relief Valve 1
1
⁄
2
NPT, 40 psi (2.8 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
260-1 1/2IN-45 1 8 2 8 2 5 Relief Valve 1
1
⁄
2
NPT, 45 psi (3.2 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
260-1 1/2IN-50 1 8 2 9 2 5 Relief Valve 1
1
⁄
2
NPT, 50 psi (3.5 kg/cm
2
) 1 7 . 3 ( 7 . 8 )
71
B
OILER
C
ONTROLS
Boiler Controls
McDonnell & Miller
Series 260
Pressure Relief Valves
08. Water Feeders 70-76• 3/6/07 1:48 PM Page 71