{"id":531,"date":"2026-10-04T16:22:30","date_gmt":"2026-10-04T16:22:30","guid":{"rendered":"https:\/\/zhuoruimech.com\/?p=531"},"modified":"2026-10-04T16:22:30","modified_gmt":"2026-10-04T16:22:30","slug":"hydraulic-relief-valve-vs-pressure-reducing-valve","status":"publish","type":"post","link":"https:\/\/zhuoruimech.com\/fr\/hydraulic-relief-valve-vs-pressure-reducing-valve\/","title":{"rendered":"Hydraulic Relief Valves vs Pressure-Reducing Valves"},"content":{"rendered":"<p>Both relief and pressure-reducing valves affect pressure, but they do different jobs. A relief valve limits pressure in the circuit it protects by opening a path when its setting is reached. A pressure-reducing valve maintains a lower pressure in a downstream branch. One should not be specified in place of the other.<\/p>\n<h2>Read where each valve senses pressure<\/h2>\n<p>A system relief valve is generally positioned to limit pump or circuit pressure. A reducing valve controls the pressure supplied to a branch such as a clamp or pilot circuit, even when the upstream system operates at a higher pressure. Parker\u2019s pressure-control catalog describes reducing valves for regulating one area of a circuit below normal system pressure. Some reducing\/relieving models can also relieve downstream pressure; that behavior is model-specific and should be read from the schematic and data sheet.<\/p>\n<h2>Contr\u00f4les techniques<\/h2>\n<ul>\n<li>Mark the pressure that must be limited and the point where it is measured.<\/li>\n<li>Confirm all downstream components have appropriate pressure ratings.<\/li>\n<li>Review valve flow capacity, pressure drop and dynamic response.<\/li>\n<li>Account for trapped-oil thermal expansion and load-induced pressure.<\/li>\n<li>Provide test points to verify the settings after commissioning.<\/li>\n<\/ul>\n<h2>Une erreur courante \u00e0 \u00e9viter<\/h2>\n<p>Setting the main relief to a lower value does not create an independently regulated low-pressure branch. It may reduce the performance of every actuator while leaving load-induced local pressure unresolved.<\/p>\n<h2>Informations \u00e0 fournir lors d'une demande de renseignements<\/h2>\n<ul>\n<li>Circuit schematic with pump and actuator ratings.<\/li>\n<li>Required system and branch pressures.<\/li>\n<li>Continuous and transient flow in each branch.<\/li>\n<li>Required pressure-setting and test procedure.<\/li>\n<\/ul>\n<p>Specify the valve function and measurement location first, then select a rated product and verify the complete circuit. For related selection guidance, see our <a href=\"https:\/\/zhuoruimech.com\/fr\/liste-de-controle-pour-les-demandes-de-devis-concernant-des-groupes-hydrauliques-sur-mesure\/\">HPU RFQ checklist<\/a>.<\/p>\n<p><small>R\u00e9f\u00e9rences techniques : <a href=\"https:\/\/ph.parker.com\/us\/17593\/en\/hydraulic-pressure-control-valves-hvd\">Parker hydraulic pressure-control valves<\/a>; <a href=\"https:\/\/www.parker.com\/content\/dam\/parker\/msg\/hydraulic-valve-systems-division\/PDF-files\/hvs-cartridge-valve-individual-pages\/legacy-catalog-pages\/hy15-3502-r\/pc\/PR103.pdf\">Parker pressure-reducing and relieving valve data<\/a>. Couverture : sch\u00e9ma conceptuel original, et non une photo du produit.<\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Understand the different jobs of system relief and branch pressure-reducing valves in a hydraulic circuit.<\/p>","protected":false},"author":1,"featured_media":530,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yj_news_hero_background_id":0,"_yj_news_eyebrow":"","_yj_news_technical_topic":"","_yj_news_cta_title":"","_yj_news_cta_description":"","_yj_news_cta_label":"","_yj_news_cta_url":"","_yj_news_related_product_ids":[],"_yj_news_related_case_ids":[],"footnotes":""},"categories":[50],"tags":[],"class_list":["post-531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Hydraulic Relief Valves vs Pressure-Reducing Valves - 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