A compact sewage relief valve that is suitable for high pressures, responds very quickly and retains all the features and benefits of the Spring–Hydraulic version. It is an attractive solution to what may be otherwise a difficult application due to higher pressures or space (height) limitations.
- Operates using separate compressed air supply – An inexpensive 120 psi (8.3 bar) air compressor may be used for 200 psi (13.8 bar) or higher relief pressures by using a large diameter closing piston (1A). Benefit: Inexpensive Control Source for large pressure range.
- Using a chamber and diaphragm isolator (8), an accurate hydraulic pilot (4) opens reliably and repeatedly at its set pressure (gauge 5A) – Full operational (including pilot) check is quickly and cleanly performed by closing valve (7) and applying pressure at (2C). For quick flush open (3B). Benefit: Operation check of all components with flushing is quick and sanitary.