Series	Name	Service	Pressure Control Range	Materials	Sizes	Cv
	BP-3	Back Pressure Regulator	Gas, Liquid	0-1,000 psig	316L SS, Brass, Monel, Hastelloy B, Hastelloy C	1/8", 1/4", 3/8"	0.2
	BP-6	Super Flow Back Pressure Regulator	Gas, Liquid	0-1,000 psig	316L SS, Monel, Hastelloy C, Titanium	1/2"	3.0
	BP-8	High Flow Back Pressure Regulator	Gas, Liquid	0-500 psig	316L SS, Brass, Monel, Hastelloy C	1/4:, 3/8", 1/2"	0.4-1.2
	BP-8LF	High Sensitivity Back Pressure Regulator	Gas, Liquid	0-500 psig	316L SS, Brass, Monel	1/4", 3/8", 1/2"	0.2
	CBP-3	Compact Back Pressure Regulator	Gas, Liquid	0-500 psig	316L SS	1/8"	0.2
	LB-1	Ultra Miniature Back Pressure Regulator	Gas, Liquid	0-500 psig	316L SS, Brass, Aluminum, Monel	1/16", 1/8"	0.005-0.30
	SBPR	Subatmospheric Back Pressure Regulator	Gas	1-30 psia	316L SS, Brass, Monel, Hastelloy C	1/4", 3/8", 1/2"	0.03-0.2
	BP-60	High Pressure Back Pressure Regulator	Gas, Liquid	0-2,000 psig	316L SS, Brass, Monel, Hastelloy C	1/4", 3/8"	0.005-0.04
	BP-66	High Pressure Back Pressure Regulator	Gas, Liquid	0-10,000 psig	316L SS, Monel, Titanium	1/4", 3/8"	0.01-0.12

 NOTES:

The BP-3 Series is designed for either liquid or gas service in instrumentation systems. Similar in design to pressure reducing control regulators which regulate outlet pressures, back pressure regulators control the inlet pressure. The many features of this regulator, particularly its precise throttling action, make it ideal for this type of application. In low flow or closed systems, over-pressures often are released by pressure relief valves. This type of relief is on/off with no throttling control. In contrast to relief valves, the back pressure control regulator with its throttling action substantially improves system pressure regulation.

The BP-6 Series was originally designed as a back pressure regulator for reverse osmosis water purification systems. It may also be easily used in pilot facilities and large instrumentation systems. The standard 316 stainless steel seat assembly, which was intended for long-term usage in sea water, may also be useful in various chemical environments. While the stainless seat assembly does not offer tight shutoff as it is not normally required in high flow systems. If more positive shutoff is required a Teflon/stainless seat assembly is available.

The BP-6 Series is normally provided in 316 stainless construction but other materials may be available.

The BP-8 Series is designed to control back pressure at low to moderate pressure ranges with relatively high flow. While designed primarily for instrumentation systems and similar to the PR-7, the BP-8 is also suitable for pilot plant, research and development activities. Special diaphragm and spring combinations give the user a selection of pressure ranges that are near atmospheric. The glass-filled Teflon/stainless seat assembly gives tight shutoff even at lower flows for most applications.

The 316SS and Teflon body assembly give service for most chemical environments and brass models are available for those applications not requiring that sort of corrosion resistance. If special requirements demand other materials of construction, please contact the factory with your needs.

The BP-8LF Series back pressure regulator is designed to furnish precise low back pressure control in analytical instrumentation. With the combination of the large diaphragm sensing area of the BP-8 series regulator and the low flow seat assembly of the BP-3 series regulator, pressure control down to 10 inches of waster is easily obtainable.

The CBP-3 Series is a compact back pressure regulator with some of the time-proven features of the BP-3 series and some new features evolving the compact size. This regulator is designed to allow the construction of compact sophisticated analytical instrumentation where the optimum in back pressure control is required. Standard features allow service in many varied applications including corrosive fluids and with the optional features available, the user can tailor this regulator to virtually any application requiring small to moderate flow rates.

The LB-1 Series is an ultra-miniature back pressure regulator that employs many of the same features found in the time-tested design of the CBP-3 & BP-3 series back pressure regulators. Designed for surface, panel or manifold mounting, the LB-1 offers the utmost in versatility to the systems designed. It's low internal volume of less than 3cc makes the LB-1 the perfect choice for systems that require rapid purge cycles. Standard features permit using this regulator in a wide variety of services, including corrosive fluids. The LB-1 can be tailored to virtually any application by utilizing the optional features. This regulator is designed to allow the construction of compact and sophisticated analytical instrumentation where the optimum in back pressure control is required and space is at a premium.

The SBPR Series subatmospheric back pressure regulator is designed to provide precise upstream vacuum control. One example of this could be to introduce a sample gas at a positive pressure into a vacuum chamber. Downstream of this chamber would be the SBPR and a vacuum pump. The positive pressure will build up in the chamber causing the SBPR to open and allow the chamber to return to the vacuum desired. The SBPR will then close and the process will repeat. The large diameter diaphragm aided by a vacuum assist spring, provides the user with optimum sensitivity for subatmospheric pressure control.

The BP-60 Series is the counterpart of the PR-50 pressure reducing series for systems that are higher in pressure and low to moderate flows. This regulator has a diaphragm for maximum sensitivity in providing relief at high pressures. The Teflon stainless seat assembly provides good shutoff in most applications. For economy purposes the cap assembly and knob are of aluminum construction as in the PR-50 companion unit. Good sensitivity and a wide selection of control ranges make this regulator an excellent selection in many research and pilot plant facilities.

The BP-66 Series is the counterpart of the PR-57 pressure reducing series for systems that are higher in pressure and low to moderate flows. This regulator has piston sensing to provide relief at high pressures. The Polyimide/stainless seat assembly provides good shutoff in most applications. For economy purposes the cap assembly and knob are of aluminum construction as in the PR-57 companion unit. Good sensitivity and a selection of control ranges make this regulator an excellent selection in many research and pilot plant facilities.

The complete Back Pressure Regulators catalog is available for download (29 pgs./757KB).