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www.Daniel.com
SPRING LOADED BACK PRESSURE VALVE
1
Introduction
1.1
Purpose of this manual
This manual provides guidance to owners and personnel in the installation, operation and
maintenance of the
Daniel
TM
Series 707 Control Valve manual, DAN-20064957
. It is
imperative that product owners and operation personnel read and follow the information
contained in this manual to ensure that the control valve is installed correctly and is
operating according to the design certifications and safety considerations.
1.2
Description of the 707 Backpressure Control
Valves
1.2.1
General features of the 707 control valve
The Daniel
™
707 Control Valve is a spring actuated pilotless valve. It uses the compression
force of pre-loaded heavy springs installed in the valve body to counter the developing
pump pressure at the upstream of the valve.
The valve comes configured with a check valve to prevent reverse flow and an adjustment
screw mechanism to adjust the spring pre-load.
The Daniel 707 Control Valves have the following characteristics:
•
Modular construction: All internal parts including seat ring can be removed with the
cylinder assembly without disturbing line connections.
•
Pilotless
•
No diaphragms
•
45° body design assures high capacity
•
Positive shut-off
•
O-ring plus metal-to-metal seat
1.2.2
Control valve applications
The 707 valve is designed primarily to maintain back pressure at the upstream of the valve.
It does not require a pilot control loop to operate and as such is better suited for high
viscosity and crude oil applications.
1.2.3
Operations overview of the 707 control valve
The Daniel 707 spring actuated control valve uses the force generated by the compression
of heavy springs installed on the spring side to the piston to counter the pressure on the
User manual
Introduction
DAN-20064957
August 2019
User manual
13
