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Valve Interlocks for Engineers

The document describes QL valve interlocks manufactured by Smith Flow Control that can be installed on lever-operated quarter-turn valves without modifying the valve. The interlock uses an anchor, adaptor, and SFC nut to securely attach to the valve lever. It has a coded lock body that accepts SFC keys to lock and unlock the lever in the open or closed position, providing tamper-proof valve security. The interlocks are made of 316 stainless steel and are suitable for installation on live plant equipment in all climates.

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300 views4 pages

Valve Interlocks for Engineers

The document describes QL valve interlocks manufactured by Smith Flow Control that can be installed on lever-operated quarter-turn valves without modifying the valve. The interlock uses an anchor, adaptor, and SFC nut to securely attach to the valve lever. It has a coded lock body that accepts SFC keys to lock and unlock the lever in the open or closed position, providing tamper-proof valve security. The interlocks are made of 316 stainless steel and are suitable for installation on live plant equipment in all climates.

Uploaded by

Romina
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SFC KEY INTERLOCKS & PROCESS MANAGEMENT SYSTEMS

QL VALVE INTERLOCKS For lever operated valves

QL VALVE INTERLOCK (QLT & QLR)

QL valve (inter)locks suit all types of lever-operated quarter-turn valves - including Ball, Butterfly and Plug valves.

Installing the (inter)lock on the host valve is a simple procedure as described below and requires no modification
or hot-work to the host equipment as the anchor and adaptors are custom-machined to suit the valve.

QLR QLT

After removing the existing lever


Adaptor Anchor the QL is assembled as follows:

1 Install lock adaptor.

2 Install anchor.

3 Fit SFC nut.

4 Assemble QL lock, secure


lever and tighten screw.

1 2

Security Screw
Lock
Body

SFC Nut

Lever

3 4
PRODUCT FEATURES
Anti-Tamper Security Screw

SFC Lever

316 Stainless steel.


Linear ‘coded-card’ key design.
Robust construction.
Proven reliability in all climates.
Single or double key versions.

SFC Nut Coded Lock Body

Anchor

Lock Adapter

Closed Key Anti- Overide Mechanism

No modification to host valve.


Suitable for any valve type/model.
Can be installed on ‘live’ plant.

Locking Gear Cam

Open Key
Smith Flow Control Ltd
6 Waterside Business Park
Eastways Industrial Estate
Witham Essex CM8 3YQ
United Kingdom
Tel: +44 (0)1376 517901
Fax: +44 (0)1376 518720
sales@smithflowcontrol.com
www.smithflowcontrol.com

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