User Guide

Page 2 / BULLETIN 10-9
THERMOSTATIC EXPANSION VALVES
Outstanding Features & Benefits
of Sporlan Thermostatic Expansion Valves
Refer to Bulletin 10-10 for complete specifications of Thermostatic Expansion Valves, with Selective Thermostatic Charges.
Refer to Bulletin 10-11 for a complete discussion on Installing and Servicing Thermostatic Expansion Valves.
10
The Refrigeration System .................................................3
Types of Expansion Devices .............................................3
How the Thermostatic Expansion Valve Works .............3
Basic Operation ............................................................3
Effect of Pressure Drop Across the Valve Port ..........4
Balanced Port TEVs ......................................................5
Equalization Method ....................................................5
Thermostatic Charges ..................................................6
Sporlan Thermostatic Expansion Valves .............................7
Alternative Refrigerants .................................................7
Sporlan Selective Charges ..........................................7
Air Conditioning & Heat Pump Applications ...............7
Refrigeration Applications ...........................................8
Special Selective Thermostatic Charges and
Elements ......................................................................9
Thermostatic Expansion Valve Applications ..................9
System Design Factors ................................................9
Balanced Port TEVs ....................................................10
System Design For Part-Load Conditions .....................11
Two or more evaporators sections
handling the same load .......................................11
Single evaporator controlled by two TEVs ...................11
Hot gas bypass and desuperheating TEVs ..............12
Off-Cycle Pressure Equalization ................................12
R-717 (Ammonia) Applications .................................13
Thermostatic Charges for Ammonia Valves ............14
Factors Affecting TEV Operation and Performance ........14
Superheat....................................................................14
Valve Setting ..............................................................15
Evaporator Temperature ...........................................15
Subcooling ..................................................................15
Refrigerant Liquid Temperature and Pressure
Drop Across TEV ...................................................16
Thermostatic Charge .................................................16
Selection Procedure ........................................................16
Recommended Thermostatic Charges ..........................18
TABLE OF CONTENTS
• SELECTIVE THERMOSTATIC CHARGES
Designed to provide optimum performance for all appli-
cations—air conditioning and heat pump, medium and
low temperature refrigeration.
• THERMOSTATIC ELEMENT DESIGN
Long lasting and field proven stainless steel diaphragm
and welded element construction.
• DIAPHRAGM DESIGN
Large flat diaphragm permits precise valve control.
• REPLACEABLE THERMOSTATIC ELEMENTS
Field replaceable elements on all standard valves.
• BALANCED PORT DESIGN
TYPES (E)BF, EBS & O
Provides perfect pin and port alignment, and prevents
changes in pressure drop across the valve from influ-
encing valve operation. Provides excellent control on
applications having widely varying operating conditions.
• PIN CARRIER DESIGN
(CONVENTIONAL VALVES)
Provides precise pin and port alignment, and better
seating.
• ACCESSIBLE INTERNAL PARTS
Durable, leakproof body joint construction allows the valve
to be disassembled, and the internal parts cleaned and
inspected.
• MATERIALS OF CONSTRUCTION
Pin and port materials offer maximum protection against
corrosion and erosion.
• SILVER SOLDERED CONNECTIONS
For leakproof, high strength connection-to-body joints.
• ADJUSTABLE SUPERHEAT DESIGN
All standard valves are externally adjustable except the
Type Nl, which is internally adjustable through its outlet
connection.
⚠WARNING – USER RESPONSIBILITY
Failure or improper selection or improper use of the products described herein or related items can cause death, personal injury and property damage.
This document and other information from Parker Hannifin Corporation, its subsidiaries and authorized distributors provide product or system options for further
investigation by users having technical expertise.
The user, through its own analysis and testing, is solely responsible for making the final selection of the system and components and assuring that all performance,
endurance, maintenance, safety and warning requirements of the application are met. The user must analyze all aspects of the application, follow applicable industry
standards, and follow the information concerning the product in the current product catalog and in any other materials provided from Parker or its subsidiaries or
authorized distributors.
To the extent that Parker or its subsidiaries or authorized distributors provide component or system options based upon data or specifications provided by the user,
the user is responsible for determining that such data and specifications are suitable and sufficient for all applications and reasonably foreseeable uses of the compo-
nents or systems.
OFFER OF SALE
The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its accep-
tance are governed by the provisions stated in the detailed “Offer of Sale” available at www.parker.com.
FOR USE ON REFRIGERATION and/or AIR CONDITIONING SYSTEMS ONLY
Bulletin 10-9, March 2011 supersedes Bulletin 10-9 dated August 2005 and all prior publications.