Alfa Laval LKC-2/LKC-H Non-return Valve

Non-return valve LKC-2 is designed for use in stainless steel pipe installations to prevent reverse flow.

Working principle

LKC-2 opens when the pressure below the valve plug exceeds the pressure above the plug and the spring force. The valve closes when pressure equalization has been achieved. A higher counter pressure will press the valve plug against the seat.

Standard Design

The valve body is in two parts, assembled by means of a clamp ring and hygienically sealed with a special seal ring. A guide disc and four legs guide the spring loaded valve plug with an O-ring seal. The valve is available with welding ends for tubes according to ISO and DIN 11850.

Technical Data

Temperature

Max. temperature: . . . . . . . . . . . . . 140°C (EPDM)
Min. temperature: . . . . . . . . . . . . . . -10°C

Pressure

Max. product pressure: . . . . . . . . . . 1000 kPa (10 bar)

Mechanical

Required differential pressure for opening the valve when fitted in a vertical pipe, as shown in fig. 3, is approx. 6 kPa (0.06 bar)

Options

Product wetted seal rings of Nitrile (NBR) or Fluorinated rubber (FPM).

Physical Data

Materials

Product wetted steel parts: . . . . . . . . 1.4301 (304) / 1.4404 (316L)
External surface finish . . . . . . . . . . . Bright (Machined Ra 1.6)
Internal surface finish . . . . . . . . . . . . Bright (polished), Ra < 0.8 µm
Product wetted seals: . . . . . . . . . . . EPDM rubber

Pressure drop/capacity diagram

 

Dimensions (mm)

Table 1. Dimensions – Vertical mounted

Table 2. Dimensions – Horizontal mounted