253B Exhaust Throttle Valves

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Overview

The 253B Exhaust Throttle Valve regulates the removal of gas from a processing system. Its flapper is positioned to modulate gas flow, thereby controlling process pressure. The 253 has a patented non-linear actuator placed between the flapper shaft and the motor drive shaft in order to generate a linear valve transfer characteristic and provide smooth linear pressure control.

Flapper is positioned to modulate gas flow
Patented non-linear actuator
Provides smooth linear pressure control

Products

Compare	Model	Compatibility	rankScore	Flange Type	Flange Size	Nominal Inside Diameter	Availability	Price
253B-1-40-1 Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF, Flapper O-ring $2,000 3 Weeks	253B-1-40-1 Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF, Flapper O-ring	UNIVERSAL	1.0	ISO-KF	NW40	1.270 in. (32 mm)	3 Weeks	$2,000
253B-1-40-2 Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF $2,000 3 Weeks	253B-1-40-2 Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF	UNIVERSAL	1.0	ISO-KF	NW40	1.270 in. (32 mm)	3 Weeks	$2,000
253B-2-50-1 Exhaust Throttle Valve, 1.888 in. ID, NW50 ISO-KF, Flapper O-ring $2,275 3 Weeks	253B-2-50-1 Exhaust Throttle Valve, 1.888 in. ID, NW50 ISO-KF, Flapper O-ring	UNIVERSAL	1.0	ISO-KF	NW50	1.888 in. (48 mm)	3 Weeks	$2,275
253B-2-50-2 Exhaust Throttle Valve, 2.00 in. ID, NW50 ISO-KF $2,275 3 Weeks	253B-2-50-2 Exhaust Throttle Valve, 2.00 in. ID, NW50 ISO-KF	UNIVERSAL	1.0	ISO-KF	NW50	2.000 in. (51 mm)	3 Weeks	$2,275
253B-20-2CF-1 Exhaust Throttle Valve, 0.779 in. ID, 2.75 in. CF Flange, Flapper O-ring $2,325 3 Weeks	253B-20-2CF-1 Exhaust Throttle Valve, 0.779 in. ID, 2.75 in. CF Flange, Flapper O-ring	UNIVERSAL	1.0	CF	2.75 in. CF	0.779 in. (20 mm)	3 Weeks	$2,325
253B-20-2CF-2 Exhaust Throttle Valve, 1.27 in. ID, 2.75 in. CF Flange $2,325 3 Weeks	253B-20-2CF-2 Exhaust Throttle Valve, 1.27 in. ID, 2.75 in. CF Flange	UNIVERSAL	1.0	CF	2.75 in. CF	0.779 in. (20 mm)	3 Weeks	$2,325
253B-20-40-1 Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF, Flapper O-ring $2,000 3 Weeks	253B-20-40-1 Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF, Flapper O-ring	UNIVERSAL	1.0	ISO-KF	NW40	0.779 in. (20 mm)	3 Weeks	$2,000
253B-20-40-2 Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF $2,000 3 Weeks	253B-20-40-2 Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF	UNIVERSAL	1.0	ISO-KF	NW40	0.779 in. (20 mm)	3 Weeks	$2,000
253B-3-80-2 Exhaust Throttle Valve, 3.00 in. ID, NW80 ISO-MF $2,400 3 Weeks	253B-3-80-2 Exhaust Throttle Valve, 3.00 in. ID, NW80 ISO-MF	UNIVERSAL	1.0	ISO-MF	NW80	3.000 in. (76 mm)	3 Weeks	$2,400
253B-4-100-2 Exhaust Throttle Valve, 3.875 in. ID, NW100 ISO-MF $2,975 3 Weeks	253B-4-100-2 Exhaust Throttle Valve, 3.875 in. ID, NW100 ISO-MF	UNIVERSAL	1.0	ISO-MF	NW100	3.875 in. (98 mm)	3 Weeks	$2,975
253B-60-63-2 Exhaust Throttle Valve, 2.362 in. ID, NW63 ISO-MF $2,350 3 Weeks	253B-60-63-2 Exhaust Throttle Valve, 2.362 in. ID, NW63 ISO-MF	UNIVERSAL	1.0	ISO-MF	NW63	2.362 in. (60 mm)	3 Weeks	$2,350

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Specifications

Type

253 Exhaust Throttle Valve
Valve Type

Butterfly/Throttle Valve
Operating Temperature

Standard: 0 - 100°C
Optional: 0 - 150°C
Valve Motor Ambient Operating Temperature

-20 to 40°C
Exposed Materials

316L S.S., Viton®
External Leak Rate

1x10^-8 scc/sec He (at shaft seal)

Closed Leakage

<10^-7 (Torr l/s)
(valves with a flapper o-ring)
Valve Speed

1.7 sec (open to close)
Drive Output Torque

Standard speed: 600 in-oz
High-speed: 170 in-oz
(with 651 Controller)
Resolution

1/12,000
Drive

Direct gear drive
Differential Pressure Across Valve

1 atm. (15 psig) max

Specifications

Type

253 Exhaust Throttle Valve
Valve Type

Butterfly/Throttle Valve
Operating Temperature

Standard: 0 - 100°C
Optional: 0 - 150°C
Valve Motor Ambient Operating Temperature

-20 to 40°C
Exposed Materials

316L S.S., Viton®
External Leak Rate

1x10^-8 scc/sec He (at shaft seal)

Closed Leakage

<10^-7 (Torr l/s)
(valves with a flapper o-ring)
Valve Speed

1.7 sec (open to close)
Drive Output Torque

Standard speed: 600 in-oz
High-speed: 170 in-oz
(with 651 Controller)
Resolution

1/12,000
Drive

Direct gear drive
Differential Pressure Across Valve

1 atm. (15 psig) max