A range of compact, lightweight, low cost control valves for use on liquid steam or gas applications. Available in 2 way and 3 way body configurations for on/off and modulating control with either pneumatic or electric actuators.
Valve Trims
Standard on/off control valves incorporate built up stainless steel plug and spindle assemblies with ptfe soft inserts with the seat profile machined directly into the body castings. Modulating valves have solid stainless steel equal percentage or linear characteristic control plug and spindle assemblies with stainless steel screw in body seats. Leakage standards, Class IV for modulating. These valves are only part of Northvale’s extensive control valve programme and will be of particular interest to end users and contractors whose process control requirements do not necessitate the use of our more sophisticated PARAGON® 600 series of valves.
Body Styles
MINIMATIC valves are available with cast bronze bodies with end connections 1/2″ to 2″ BSPT or with flanges 15mm to 40mm PN16 for pressures up to 16 bar and 180°C.
For aggressive chemical applications investment cast 316 stainless steel bodies 1/2″, 3/4″, 1″ are available for services up to 25 bar and 180°C.
Gland Sealing
All MINIMATIC control valves incorporate our new “Low Fugitive Emission” maintenance free gland seals incorporating a modified spring loaded ptfe chevron ring set and new temperature compensated, split guide bushes widely spaced at the base of the gland and with the upper bush retained in the gland nut. These self-adjusting maintenance free glands result in improved sealing and extended periods between major overhauls.
New Minimatic Valve with Positioner
Northvale Korting has enhanced its mini control valve range with the addition of a new I to P positioner to the valve.
Valve Sizing
The universal method of valve sizing is by the Kv or Cv method. Both these flow coefficients give a positive indication of a valve’s capacity to handle flow. Each line size MINIMATIC control valve has a single fixed Kv value shown in the relative detail pages in this catalogue.
For practical purposes Northvale Korting uses simplified sizing formulas. More complex formulas for steam and gas will give only minor variations and are only appropriate for severe service conditions.
Having calculated the Kv coefficient required from the following formula the appropriate control valve size can be selected from the graphs, taking into account the maximum and minimum flow requirements. MINIMATIC control valves have modest turndown ratios and it is good practice to select a valve size which is 80-90% of its full stroke at max Kv requirement and not less than 10% at minimum Kv requirement.
On/Off and Modulating Control
To meet the growing demand for electrically operated valves Northvale introduced a range of lightweight, high output, linear electric actuators to fit all sizes of MINIMATIC valves.
Available in 2 way and 3 way body styles with soft seats for on/off and profiled stainless steel trim for modulating control.
Actuator Options
Actuators can be selected to suit different supply conditions and functions:
(a) On/Off valves – 24 and 220/240 volt ac
(b) Modulating valves – 24 volt ac only.
Standard actuators will remain “Stay Put” in their last position in the event of a power supply failure, for both 24 volt and 220/240 volt systems. Spring return actuators are available for 24 volt supply systems only and can be arranged to fail open or closed in the event of a power supply failure.
Control Signals
Modulating valves can be controlled by input signals either 0-10 volt dc or 4-20mA by simply selecting the appropriate connections on the terminal strip within the enclosure. Valves can be easily changed from one system to the other without the need to return them to the factory.