How do I replace the needle in the Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291?

To replace the needle in the Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291, follow these steps: 1. Depressurize the hydraulic system fully and isolate the valve. 2. Unscrew and remove the valve from the manometer/installation if needed for access. 3. Remove the knob (polyamide 66) by unscrewing or pulling off, exposing the needle stem. 4. Carefully unthread and withdraw the worn needle (carbon steel) from the valve body, taking care not to damage the sealing surfaces. 5. Inspect the seat and internal threads; clean debris and check seals (NBR/PTFE). Replace seals if worn. 6. Fit the replacement needle of correct specification, screw it in smoothly and ensure proper engagement with the seat. 7. Reinstall the knob and reassemble the valve into the system or onto the manometer. 8. Pressurize slowly, check for leaks and confirm proper isolation function. 9. If difficulty or damage to body threads/seat is found, consider replacement or consult manufacturer; stainless AISI 316 version available on request.

How do I clean and maintain the Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291?

Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291. Cleaning and maintenance 1. Safety first - Relieve system pressure and vent residual fluid before any work. - Wear appropriate PPE (gloves, eye protection). - Ensure compatible fluids and temperatures (operation range â20Â°C to +100Â°C). 2. External cleaning - Wipe body and knob with a clean cloth dampened in mild soapy water or a neutral degreaser. - Do not use strong acids, chlorinated solvents or abrasive cleaners that can damage galvanization, polyamide knob or seals. 3. Disassembly (basic service) - Isolate and depressurize the circuit. - Unscrew valve from installation using appropriate wrench on hex flats; avoid twisting the knob assembly excessively. - For FT291, mind the 90Â° orientation when reassembling. 4. Internal inspection and cleaning - Open valve fully and inspect needle and seat for wear, scoring or deposits. - Remove light debris and deposits with a soft brush and isopropyl alcohol or a mild solvent compatible with NBR/PTFE. - Do not scratch seating surfaces; avoid metal picks. - If heavy corrosion or pitting is present, consider replacementâespecially near sealing surfaces. 5. Seals and components - Inspect NBR/PTFE sealing elements for hardening, cuts, swelling or extrusion. - Replace seals showing deterioration. Use compatible NBR/PTFE spares. - Check needle for straightness and smooth travel; replace if bent or damaged. 6. Lubrication and reassembly - Lightly lubricate moving parts with a hydraulic-system-compatible lubricant safe for NBR/PTFE (consult fluid compatibility). - Reassemble in reverse order, ensuring proper orientation (panel mount thread under knob if used). - Torque fittings to recommended values for male thread connections; avoid overâtightening. 7. Functional check - Reinstall, pressurize slowly, and check for leaks and smooth operation through full travel. - Verify manometer isolation and that no pressure spikes occur during operation. 8. Maintenance schedule - Visual check monthly in harsh environments; full inspection and seal check every 6â12 months depending on duty cycle and hydraulic fluid cleanliness. - Replace valve if repeated leakage, significant wear, or compromised needle/seat is found. Notes - For units in AISI 316 (special request) follow same procedure; cleaning solvents and clamp choices can differ with stainless steel. - At 350 bar working pressure, prioritize component integrityâdo not attempt repairs beyond seal replacement if doubt exists.

Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291

Q: Can the Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291 be panel-mounted under the knob?

Yes. The Manometer shut-off valve with male thread, galvanized steel, type FT 290 / FT 291 can be panel-mounted under the knob. The product description explicitly states: "Panel mounting possible on the thread under the knob." Both the straight (FT290) and 90Â° angled (FT291) versions support this mounting option.

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Additional information

Material	CS – steel (cast iron)
Standard length [m]	10

Steel needle shut-off valve with manometer connection, used in hydraulic systems as an isolating element for the manometer from the installation, protecting against overload and pressure spikes during opening and allowing for replacement. Simple version (FT290) and 90° angled version (FT291). Panel mounting possible on the thread under the knob. Available in AISI 316 stainless steel upon special request. Material: galvanized carbon steel (body), carbon steel (needle), polyamide 66 (knob). Sealing: NBR/PTFE. Working pressure: 350 bar. Operating temperature: from -20°C to +100°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-FT290-04	Shut-off valve FT290 G 1/4" under pressure / GZ 1/4"	-	350	In stock	Enquiry
DC-FT290-08	FT290 straight shut-off valve, 1/2" BSP male / 1/2" BSPT female	-	350	In stock	Enquiry
DC-FT291-04	Shut-off valve FT291 G 1/4" under man./ GZ 1/4"	-	350	In stock	Enquiry

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Steel needle shut-off valve with manometer connection, used in hydraulic systems as an isolating element for the manometer from the installation, protecting against overload and pressure spikes during opening and allowing for replacement. Simple version (FT290) and 90° angled version (FT291). Panel mounting possible on the thread under the knob. Available in AISI 316 stainless steel upon special request. Material: galvanized carbon steel (body), carbon steel (needle), polyamide 66 (knob). Sealing: NBR/PTFE. Working pressure: 350 bar. Operating temperature: from -20°C to +100°C.