PENN Controls - Building Automation and Controls - Electronic Expansion Valve - QREV and PSHC Electronic Expansion Valve and Superheat Controller - QREV - Introduction - LIT-12012398 - 2019-05-20

Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC) Product Bulletin

brand
PENN Controls
prodname
QREV and PSHC Electronic Expansion Valve and Superheat Controller
doctype
Product Bulletin
docnumber
LIT-12012398
revised_modified
2019-05-20

The Quick Response Expansion Valve (QREV) and the Precision Superheat Controller (PSHC) together are a compact, electronic, closed loop, rapid response superheat control solution for refrigeration and HVAC applications.

The QREV is next generation electronic expansion valve (EEV) technology, and provides maximum evaporator efficiency by quickly reaching the preferred superheat. The QREV includes a silicon-based microelectromechanical system (MEMS) pilot valve that responds to a signal from the PSHC and pilots a smooth gliding spool valve that regulates refrigerant flow through the QREV, virtually eliminating valve wear and extending valve life. You can order QREVs in several capacity ranges.

The PSHC is an electronic superheat controller that provides precise control to the QREV through varying load conditions. You install the PSHC on a pressure port at the evaporator outlet. The PSHC uses an internal pressure sensor and an external temperature sensor to control the QREV flow and maintain the preferred superheat at the evaporator outlet. The PSHCs are currently set up to control one of 18 approved refrigerants for easy commissioning.

Figure 1. QREV, PSHC, and wiring harness