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Control Valves
Pressure Reducing



Pressure Reducing

Pressure Reducing Valves

Self Contained Air Operated

Air Operated 1/2" thru to 4" Threaded and 250 Cast Iron Flanged

Leslie Super G Series valves are quite simply the best pressure reducing valves on the market. Available in versions suitable for steam, air and gas pressure and temperature control, they combine the simplicity of a self-contained regulator with the performance of more sophisticated control systems at a fraction of the cost. All Super G regulators have a very high rangeability (100:1) with no maximum pressure drop or pressure ratio limitations, and are very accurate over their full flow range.

Simple and Reliable

Leslie Super G There are only two moving parts in the valve body, making for drastically reduced maintenance headaches. The main control component is our exclusive Spiroflex® stainless steel diaphragm that operates smoothly over the full flow range and is capable of longer travel for high flow capacities. This is a long-lasting diaphragm with minimal maintenance characteristics. Another benefit of the Spiroflex® diaphragm is the ability to achieve total control with a minimum delta-p of 0.5 psi. Maximum Interchangeability
Many replacement parts are common across the line, thus reducing parts inventory cost. And those parts that might need inspection and replacement can be serviced without removing the valve from the line.

An Unusual Three-Year Warranty
Leslie Class GPK, GPB, and GPKP-1 pressure reducing valves, when installed and operated in accordance with our instructions, will be repaired or replaced free of charge if a failure should occur within three years from our shipping date. (We cannot be responsible for special or consequential costs or damages.)

Self Contained PRV Regulators 1/2" thru to 4" Threaded and 250 Cast Iron Flanged

Leslie GPKP-1 valves feature a unique patented dual diaphragm sensing chamber that provides unparalleled control accuracy and stability in one self-contained package. Large pilot clearances are far less subject to fouling problems, non-continuous bleed results in less direct carryover through the pilot assembly, and the constant-gain pilot makes for unmatched performance accuracy throughout the entire operating range. A single Leslie GPKP-1 can be used in many applications where competitive designs must use multiple regulators in double reduction and 1/3-2/3 installations.


 Leslie L Series
Internal Pilot, Piston-Operated Reducing Valves and
LX Series Differential Pressure Regulators

• 1/2 - 3" Valve Sizes



• ANSI CL 125 - 600



• End Conn.: THD, SWE, BWE, RF


• Body Mat'l: Cast Iron (LKY), WCB (LS-5),  Bronze (LY)



General Pressure Reduction and Regulation Service
Leslie L Series internal pilot, piston operated reducing valves provide a high degree of accuracy over the entire flow range and a widely adjustable reduced pressure range. Single-seated, with a fully-guided main stem that closes with inlet pressure, this valve demonstrates superior ability for tight shut-off.

L Series valves are available with Teflon® self-cleaning piston seal or metal piston rings.

Differential Pressure Service
Leslie LX Series differential pressure regulators maintain a constant differential between the air, gas or steam pressure passing through the regulator, and any other liquid or gas pressure whose relationship to the regulator outlet pressure should be a constant. The differential is maintained regardless of operating variation.

LX Series regulators are adjustable to a differential pressure range of 5 psi to 40 psi. All valves in this series provide this differential range, without changing springs or diaphragms.

These differential pressure regulators are available in the same sizes and ratings at the "L" Series reducing valves.