CNG Field Service Bulletin
Luxfer Cylinder Valve Torque Precaution
ENP-714
November 15, 2018

1. Introduction
Luxfer Gas Cylinders issued a technical bulletin regarding over torque prevention for their
One-Turn Valve (OTV) model MPVE-250.
The bulletin is attached for your reference.
For additional information, contact Luxfer Customer Service via telephone or e-mail:
+1 800 764 0366
+1 951 684 5110
[email protected]

Warning Messages Used in this Bulletin

Personal injury or death may occur if procedures are not followed.
Depressurize and defuel the cylinder(s) before performing work on the valve.

Proprietary Statement
The information provided within this document is proprietary and confidential. All prior
versions, including updates and revisions forwarded separately, are proprietary. The
information provided by Agility Fuel Solutions to its customers and clients is solely for the
use of those customers and clients. No portion of this manual may be reproduced or
distributed without express written consent of Agility Fuel Solutions. Agility Fuel Solutions
reserves the right to utilize the intellectual property contained within this publication as
content for any other publication produced by Agility Fuel Solutions.
Trademark Notice
Agility® and TUFFSHELL® are registered trademarks of Agility Fuel Solutions. Drop-NGo™ is a trademark of Agility Fuel Solutions. Trademarks of other manufacturers are the
property of their respective companies.
Agility Fuel Solutions | 3335 Susan Street Suite 100 | Costa Mesa, CA 92626 USA
www.agilityfuelsolutions.com

ENP-714: Luxfer Cylinder Valve Torque Precaution (Downloaded Copy is Not Controlled)

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TECHNICAL BULLETIN
September 4, 2018

Luxfer OTV (One-Turn Valve) Model: MPVE-250

Topic: Over-Torque Prevention

Valve Use
WARNING: HAND OPERATE ONLY. DO NOT
USE TOOLS ON THE KNOB.
Valve is OPEN by turning counterclockwise
(CCW) 1-TURN ONLY. Valve is CLOSED by
turning clockwise (CW) 1-TURN ONLY.
WARNING: DO NOT APPLY EXCESSIVE
TORQUE. For reference, maximum allowed
torque is 45 in.-lbs.

Valve
State

Knob
Gap

Open

0.54”

Closed

0.40”

KNOB GAP

Valve will open and close with hand torque ONLY and will be
confirmed by positive stop of the handle. If in doubt, the valve’s
opened/closed state can be confirmed by measurement (see beside).
WARNING: DO NOT force knob past 1 turn from the open or closed
position. This can create unsafe conditions.

Over-Torque & Knob Damage
WARNING: Torques greater than the maximum specified are
unnecessary and can damage the valve and in extreme over-torque
cases might create unsafe conditions.
High over-torques can split the knob into 2 or 3 pieces. A cracked or
split knob does not affect valve sealing; however, it indicates excessive
torque applied to the knob. Replace a cracked or split knob immediately.

Luxfer OTV (One Turn Valve) Model: MPVE-250
Topic: Over-Torque Prevention

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Mitigation
Luxfer has a complementary upgrade kit available which can mitigate the impact of excessive
torque. An appropriately-skilled technician can quickly install the kit in the field. The kit consists of
both knob and back-up ring upgrade parts.

A.

Knob Upgrade
The knob upgrade has 4 pieces (see below left). It raises the knob ~ ⅛” and slightly
changes the appearance of the top of the knob (see below right). This knob is stronger
and more difficult to turn with a tool.
4-piece knob

B.

Knob upgrade installed

Back-Up Ring / Nut Upgrade
The kit includes a back-up ring and nut that are added to internal retaining ring (see
below). Installing these parts doubles the valve’s over-torque resistance.

Nut

Back-up
ring/nut
installed

Nut

Back-up ring

Nut
Back-up ring

Contact
For additional information please contact Luxfer Customer Service at:
1-800-764-0366 or +1 951 684 5110
or email: [email protected]

Luxfer OTV (One Turn Valve) Model: MPVE-250
Topic: Over-Torque Prevention

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