ARC Aseptic Remote-Controlled Valve with PTFE Diaphragm

Transcription

1 ARC Aseptic Remote-Controlled Valve with PTFE Diaphragm PD GB Application ARC is an aseptic seat valve with PTFE diaphragm. It is available as a stop- or change-over valve. The valve is suited for aseptic operating conditions such as high sterilisation temperatures. ARC is characterised by excellent cleanability. Working principle ARC is operated by means of compressed air and can be supplied with or without spring return. Sterile stem sealing towards the atmosphere is ensured by a special designed PTFE/rubber diaphragm unit. The PTFE diaphragm does not allow product residues to build up on the product contact surface. Standard design ARC is based on the SRC valve design. It consists of actuator, intermediate piece, stem with diaphragm unit and valve bodies. The change-over version is a two body design. The valve is assembled by means of clamp rings and a stem clip system for easy maintenance. Materials Product wetted steel parts: Acid-resistant steel AISI 316L. Other steel parts: Stainless steel AISI 34. Finish: Semi bright. Product wetted seals: EPDM, PTFE. Other seals: NBR, EPDM. Technical data Pressure range: -8 kpa (-8 bar). Temperature range: -1 o C to +14 o C (EPDM). Optimum process conditions: >5 kpa (.5 bar), >2 o C. Max. sterilization temperature (steam - short time):15 o C-38 kpa (3.8 bar). Air pressure: 5-8 kpa (5-8 bar). Note! Vacuum is not recommended in aseptic applications. Expected lifetime of diaphragm unit under normal conditions: (no pressure shocks or cavitation). Size/Type Stop valve Change-over valve activations activations 38mm/DN mm/DN mm/DN mm/DN mm/DN Fig. 1. ARC with valve body combination 2 Valve body combinations Fig. 2. ARC diaphragm stem seal Actuator function. Pneumatic downward movement, spring return (NO). Pneumatic upward movement, spring return (NC). Pneumatic upward and downward movement (A/A). Other valves in the same basic design Sanitary Remote-Controlled valve, type SRC. Sanitary Long-Stroke valve, type SRC-LS. Sanitary Manual valve, type SMO. See also PD 619, PD and PD 689. Note! Activating the valve without internal product pressure reduces lifetime of diaphragm unit.

2 Pressure drop/capacity diagrams Stop valve

3 Pressure drop/capacity diagrams Change-over valve

4 Pressure data for ARC Actuator type / function 1. Pneumatic downward movement, spring return (NO-lower seat). 2. Pneumatic upward movement, spring return (NC-lower seat). 3. Pneumatic upward and downward movement (A/A). 6. Three-position (NO-lower seat).. Three-position (NC-lower seat). Table 1: Standard Valves - Max. static pressure in bar without leakage, valve seat fully closed. Actuator / Valve body Air Actuator Valve size Air consumption combination and direc- pressure type/ Type DN4 DN5 DN65 DN8 DN1 (Litres free air per stroke) tion of pressure (bar) function mm mm mm mm mm mm mm 1(NO) (NC).2 x Air pressure (bar). x Air pressure (bar) 5 1(NC) ISO DIN (NO) ISO DIN (NC) (NC) (NC) ISO (NC) DIN Table 2: Valves with reinforced spring or larger actuator - max. static pressure in bar without leakage, valve seat fully closed. Actuator/valve body Air Actuator Reinforced spring Larger actuator combination and direction pressure type/ Type Valve size Valve size of liquid pressure (bar) function DN4 DN5 DN65 DN8 DN mm mm mm mm mm mm mm mm 1(NO) 6(NO) ISO DIN (NO) DIN (NO) ISO (NC) (NC) (NC) ISO (NC) DIN

5 Pressure data for ARC Max. pressure in bar for ARC standard valves. Max. pressure in bar for ARC with reinforced spring. Max. pressure in bar for ARC with larger actuator. Table 3: The valve is in the closing phase. Approx. max. pressure at which the valve plug can close by means of the spring or air pressure. Actuator/valve body Actuator Valve size combination and direction type/function DN4 DN5 DN65 DN8 DN1 of pressure mm mm mm mm mm 2(NC) (NC) (6 bar) 1(NO) (NO) Table 4: Standard valves - Approx. static pressure in bar against which the valve plug can open by means of the spring or air pressure. Actuator/valve body Actuator Valve size combination and direction type/function DN4 DN5 DN65 DN8 DN1 of liquid pressure ,5 6 11,6 mm mm mm mm mm (NO) Spring opens Air opens (6 bar) Air opens (6 bar) Spring opens 6(NO) (NO) (NO) (NC) (NC) (NC) (NC) Table 5: The valve is closed - at these liquid pressures the valve will open. Actuator/valve body Actuator Valve size combination and direction type/function DN4 DN5 DN65 DN8 DN1 of pressure (bar) ,5 6 11,6 mm mm mm mm mm 2(NC) (NC) 1(NO) (6 bar) 6(NO) 1 1 1

6 Dimensions (mm) Size mm mm mm mm mm DN DN DN DN DN A A A A OD ID t C E F F H M/ISO clamp M/ISO male M/SMS male M/DIN male M/BS male Weigth (kg): Stop Change-over Options Equipment A) Male parts or clamp liners in accordance with required standard. B) Control & Indication (see chapter in Product Catalogue). C) Damper against water hammer. D) Actuator with stronger spring. E) Larger actuator for valve size mm, DN F) Two-step or three-position actuator. G) Tangential side port valve. A 1 H F 1 A 2 A 3 H F 2 A 4 Materials grades H) Product wetted seals of Nitrile (NBR) or Fluorinated rubber (FPM). C Tools I) Service tool for actuator. E E Ordering Please state the following when ordering: - Connections if not welding ends. - Size. - Valve body combination. - Actuator function, NO, NC or A/A. - Options. t E ID OD a.stop valve. Fig. 3. Dimensions. M t E M ID OD b.change-over valve. PD GB Sanitary Equipment, Headquarter Alfa Laval AB P O Box 3 SE-221 LUND, Sweden Telephone: Fax: sanitary.equipment@alfalaval.com The information contained herein is correct at the time of issue, but may be subject to change without prior notice.