Liquid Controls Air Actuated & Differential Check Valves K-7, K-15, & K-30 - Manual (Page 2)

2
K-7 Valve Operation
Table of Contents
Description Page Number
General Information .................................................. 2
Specifications ............................................................ 3
K-7 Valves ................................................................. 4-5
Installation ................................................................. 4
New Installations ....................................................... 4
Retrofit Installations ................................................... 4
Disassembly and Reassembly .................................. 5
K-15 Valves ............................................................... 6-7
Installation ................................................................. 6
New Installations ....................................................... 6
Retrofit Installations ................................................... 6
General Information
Liquid Controls Air Actuated/Differential Check Valves
are designed to prevent flow whenever air or vapor is
present, thereby assuring accurate measurement.
Check Valves are normally closed, spring loaded valves
installed on the meter outlet. When fluid enters the valve
from the inlet side, and the pressure is greater than the
back pressure combined with the force of the spring, the
spring will compress, opening the valve and allowing fluid
to pass through (as shown in the figure below).
When back pressure plus spring strength is greater than
the fluid pressure entering the meter, the valve will remain
closed.
These meters are used in conjunction with the air/vapor
eliminator to prevent air/vapor from being metered. This
is important when split compartment testing.
Disassembly and Reassembly .................................. 7
K-30 Valves ............................................................... 8
Installation ................................................................. 8
New Installations ....................................................... 8
Retrofit Installations ................................................... 8
Illustrated Parts Breakdown ...................................... 9-11
K-7 Valves ................................................................. 9
K-15 Valves ............................................................... 10
K-30 Valves ............................................................... 11
Description Page Number
! ! ! ! ! WARNING
• Before using this product, read and understand the instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application, installation, and maintenance
of equipment and/or systems in accordance with all applicable codes and ordinances.
• Failure to follow the instructions set forth in this publication could result in property damage, personal injury, or
death from fire and/or explosion, or other hazards that may be associated with this type of equipment.
Publication Updates and Translations
The most current English versions of all Liquid Controls publications are available on our website, www.lcmeter.com.
It is the responsibility of the Local Distributor to provide the most current version of LC Manuals, Instructions, and
Specification Sheets in the required language of the country, or the language of the end user to which the products are
shipping . If there are questions about the language of any LC Manuals, Instructions, or Specification Sheets, please
contact your Local Distributor.