MK series
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THROTTLE/CHECK VALVE TYPE MK Size 6 through 30 up to 31,5 MPa up to 400dm 3 /min APPLICATION Valves type MK are throttle / check valves in which flow is dependent on temperature and pressure drop at the throttle point. They are designed to control the fluid flow rate in one direction and allow free slow in the opposite direction. The valves may be used in hydraulic systems, when working resistance is constant or change in speed at changing load is of no importance. The valves are for direct in-line mounting in any position by means of couplings. When there is a flow in throttle direction, fluid reaches the rear side of the poppet 3 of the check valve which is pushed onto its seat in the housing 2 by the spring 6. The fluid flows to the variable orifice 4 through the side bores in the poppet 3. Throttling takes place between the housing 2 and adjustable sleeve 1. With flow in the opposite direction, the fluid acts on the face surface of the poppet 3. The poppet 3 is lifted from its seat and the fluid flows freely through the valve. Simultaneously, part of the fluid getting through the ring slot 5 creates the desired effect as its self-cleaning. Caution : hold The valve install in hydraulic system to take hold on 2. hexagon of housing item 2. 1. It isn’t to allow for turn up the valve by nut item 1. Do not adjust under pressure.

TECHNICAL DATA Hydraulic fluid Filtrati Filtration ltrat Recommended filtration Nominal fluid viscosity Viscosity range Optimum working temperature (fluid in a tank) Fluid temperature range ati Maximum oper ating pres sure imum operat press Crack press Cracking pres sure ac

SCHEMES Graphical symbol PERFORMANCE CURVES measured meas ured at v = 41 mm 2/s and t = 50 oC ∆ p - Q curve - via open check valve with closed throttle ∆ p - Q curve - via closed check valve with open throttle

Orders coded in the way showed below should be forwarded to the manufacturer. Nominal size Direct in-line mounting Series number (10-19) - installation and connection dimensions remain NBR (for Fluids on mineral oil base) FPM (For Fluids on phosphate ester base) Further requirements in clear text (to be agreed upon with the manufacturer) Throttle/check valve should be ordered according to the above coding. The symbols in bold are the preferred versions available in short delivery time.