LF-6900 pages

LF-690 SERIES

‘Low Flow’ Hydraulic Reducing Regulator Piston Sensed for outlet control to 1380bar / 20000psi
Now with ceramic seating as standard
HANDLE

MAIN
SPRING

BEARING
SCREW

BONNET
ADJUSTING
SCREW

SENSOR
HOLDER
VENT
SEAT
SENSOR

VENT SEAT
NUT

CONNECTOR
HYDRAULIC
MAIN VALVE

OUTLET

BAFFLE
PLATE
SEAT
CARTRIDGE

INLET

BODY NUT

The LF-690 uses Ceramic Seating to provide ultimate
protection against the harsh service encountered on
hydraulic services. The unique seating cartridge provides
a dampening action on this critical component to prevent
‘chattering’ or ‘unstable frequency resonance’. The regulator
is self relieving with segregated captured vent to prevent
deterioration to the loading mechanism and making the
regulator cleaner to service. The seating area can easily be
accessed from the base of the regulator for speedy servicing
in situ.
APPLICATIONS:
• Wellhead logic and control systems
• Subsea valve actuator control
• Valve test rigs
• Liquid sampling
• Hydraulic Power Packs
FEATURES:
1380bar/20,000psi inlet pressure
Ceramic seating for ultimate resistance against
cavitation and erosion. Precision machined sensing
elements. 5 Sensor ranges for combination of low torque and
high sensitivity. Segregated captured vent
316SS Panel mounting rings

*Assembly drawing for reference only. Refer to office for specific detail.

STANDARD MATERIALS OF CONSTRUCTION
Regulator part
Body
Bonnet
Main valve
Seat
Valve spring
Sensor and Holder
Handwheel
Baffle Plate
Spring rests
‘O’ ring seals
Adjusting screw
Loading Spring
Bottom Nut
Lubricant

Material
316SS or 17-4PH SS
316SS
Ceramic TX2000
Ceramic TX3000
302SS
316SS
Nylon
316SS
316SS
NBR, Viton or EPDM
Ali Bronze
Spring Steel
316SS
Krytox GPL 205

NOTE: Product availability and specifications contained herein are subject to change without notice. Consult local distributor or factory for potential revisions and/or service related issues.

PRESSURE TECH LTD, Unit 24, Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QH
Tel: +44 (0)1457 899307 Fax: +44 (0)1457 899308
e-mail: info@pressure-tech.com

// pg 1 of 2

www.pressure-tech.com
Designed and built in the UK