253B Exhaust Throttle Valves

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.

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Showing 10 of 11 total products

Description	Compatibility	Flange Type	Flange Size	Nominal Inside Diameter	Price
253B-1-40-1Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF, Flapper O-ring	UNIVERSAL	ISO-KF	NW40	1.270 in. (32 mm)	$2,432
253B-1-40-2Exhaust Throttle Valve, 1.27 in. ID, NW40 ISO-KF	UNIVERSAL	ISO-KF	NW40	1.270 in. (32 mm)	$2,432
253B-2-50-1Exhaust Throttle Valve, 1.888 in. ID, NW50 ISO-KF, Flapper O-ring	UNIVERSAL	ISO-KF	NW50	1.888 in. (48 mm)	$2,767
253B-2-50-2Exhaust Throttle Valve, 2.00 in. ID, NW50 ISO-KF	UNIVERSAL	ISO-KF	NW50	2.000 in. (51 mm)	$2,767
253B-20-2CF-1Exhaust Throttle Valve, 0.779 in. ID, 2.75 in. CF Flange, Flapper O-ring	UNIVERSAL	CF	2.75 in. CF	0.779 in. (20 mm)	$2,829
253B-20-2CF-2Exhaust Throttle Valve, 1.27 in. ID, 2.75 in. CF Flange	UNIVERSAL	CF	2.75 in. CF	0.779 in. (20 mm)	$2,829
253B-20-40-1Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF, Flapper O-ring	UNIVERSAL	ISO-KF	NW40	0.779 in. (20 mm)	$2,432
253B-20-40-2Exhaust Throttle Valve, 0.779 in. ID, NW40 ISO-KF	UNIVERSAL	ISO-KF	NW40	0.779 in. (20 mm)	$2,432
253B-3-80-2Exhaust Throttle Valve, 3.00 in. ID, NW80 ISO-MF	UNIVERSAL	ISO-MF	NW80	3.000 in. (76 mm)	$2,918
253B-4-100-2Exhaust Throttle Valve, 3.875 in. ID, NW100 ISO-MF	UNIVERSAL	ISO-MF	NW100	3.875 in. (98 mm)	$3,619

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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

Accessories

Other Accessories

	Compare	Description	Compatibility	Drawings, CAD & Specs	Avail.	Price
		CB651-30-10Throttle Valve Cable, 651 Controller to 253 Valve, 10 ft.	UNIVERSAL			$126

Resources

Manuals

253B Throttling Valve Manual(0, PDF)