{"id":46336,"date":"2026-01-06T17:12:06","date_gmt":"2026-01-06T17:12:06","guid":{"rendered":"https:\/\/www.alicat.com\/?p=46336"},"modified":"2026-02-05T21:38:41","modified_gmt":"2026-02-05T21:38:41","slug":"pilotdruckregelung-mit-alicat-geraten","status":"publish","type":"post","link":"https:\/\/www.alicat.com\/de\/articles\/pilot-pressure-control-with-alicat-devices\/","title":{"rendered":"Pilotdruckregelung in druckbeaufschlagten Druckreglern"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;2em||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;Pilot Pressure: Alicat Devices Paired with Dome Loaded Pressure Regulators&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_css_free_form=&#8221;selector h1 {||  text-wrap: pretty;||}&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/12\/dome-loaded-pressure-hero.webp&#8221; alt=&#8221;Done loaded pressure regulators with pilot pressure control&#8221; align=&#8221;center&#8221; force_fullwidth=&#8221;on&#8221; module_id=&#8221;article-hero-image&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1.5rem||||false|false&#8221; custom_css_free_form=&#8221;selector img {||  object-fit: cover;||}&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_divider color=&#8221;#2A3B47&#8243; divider_weight=&#8221;2.5px&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; height=&#8221;0px&#8221; custom_margin=&#8221;3rem||3rem||true|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;What is pilot pressure? &#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;]Pilot pressure refers to the pneumatic control signal that defines a regulator\u2019s setpoint. In pressure control systems that use dome-loaded pressure regulators, this pilot signal is generated by a separate pilot device and directly determines how the regulator opens and closes to maintain the desired process pressure.\n\nIn applications with extreme temperatures and pressures, severe chemistry, mixed fluid phases, or other challenging operating conditions, a dome-loaded pressure regulator (DLPR) is often the preferred solution. Unlike conventional spring-loaded regulators, dome-loaded designs use a flexible diaphragm and an externally applied control pressure to balance against the process pressure. This operating principle allows them to handle large pressure differentials while maintaining stable, repeatable control across a wide range of flows.\n\nSome common conditions where DLPR valves shine include:\n<ul>\n\t<li>Operating pressures above 1000 PSI, where spring-based regulators struggle with stability and hysteresis<\/li>\n\t<li>Extreme process temperatures, including environments that degrade elastomers or mechanical springs<\/li>\n\t<li>High flow rates with wide turndown requirements<\/li>\n\t<li>Corrosive or reactive materials, where isolating the control device from the process is critical<\/li>\n<\/ul>\nBecause a dome-loaded regulator cannot generate its own setpoint, its performance is largely determined by the device supplying pilot pressure to the dome. In simple systems, this pilot pressure may be provided by a manual regulator or a fixed pressure source. For applications that require dynamically adjustable setpoints, tight pressure tolerances, or integration into automated control systems, electronic pilot pressure control is often required to fully realize the regulator\u2019s precision, responsiveness, and repeatability.[\/et_pb_text][et_pb_heading title=&#8221;Raising the Equilibar&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]For applications with extreme pressures, temperatures, mixed phase fluids, and ASME BPE sanitary requirements, Alicat<sup>\u00ae<\/sup> flow and pressure instruments benefit from pairing with <a href=\"https:\/\/www.equilibar.com\/back-pressure-regulators\/how-it-works\/\" target=\"_blank\" rel=\"noopener\">Equilibar<sup>\u00ae<\/sup><\/a>\u00a0regulators and valves.\n\nEquilibar back pressure regulators (BPRs) and flow control valves (FCVs) offer stable control across an extremely wide range of flow rates, with models offering control of valve flow coefficient (Cv) down to 1e-9. Equilibar valves also come in models with chemical resistance and high temperature tolerances up to 450\u00baC. The dome-loaded, multiple orifice design offers instantaneous control and exceptional precision for the most complex of applications. Using a flexible mechanical diaphragm as its only moving part to provide frictionless and stable operation, Equilibar valves provide superior precision and repeatability, especially for low flow rates, mixed phase fluids, corrosive media, and extreme temperatures and pressures.\n\nEquilibar valves and Alicat precision instruments are complementary when used in combination. Both have extremely high resolution, allowing each to take advantage of the other\u2019s high precision control.[\/et_pb_text][et_pb_heading title=&#8221;Pairing an Equilibar back pressure regulator and Alicat pressure controller&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-controller\/dual-valve-pressure-controllers\/\">Alicat PCD-Series dual-valve pressure controllers<\/a> can regulate pressure for closed volumes up to <a href=\"https:\/\/documents.alicat.com\/specifications\/DOC-SPECS-PCD.pdf\" target=\"_blank\">3000 PSI<\/a>, making them well suited for use as electronic pilot pressure sources for dome-loaded back pressure regulators. The high resolution of the PCD provides true 1:1 control of dome pressure, enabling pressure regulation down to hundredths of a PSI when paired with a dome-loaded regulator such as an Equilibar BPR.[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||0px||false|false&#8221; custom_padding=&#8221;||2rem||false|false&#8221; custom_padding_last_edited=&#8221;off|desktop&#8221; custom_css_free_form=&#8221;selector figure {||  display: table;||  margin-left: auto;||  margin-right: auto;||  text-align: center;||}||||selector figcaption {||  caption-side: bottom;||  display: table-caption;||}||||selector img {||  margin-bottom: 1rem;||}&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_last_edited=&#8221;on|phone&#8221; theme_builder_area=&#8221;post_content&#8221;]<figure><img decoding=\"async\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/Equilibar-PC-1024x289.webp\" width=\"1024\" height=\"289\" alt=\"Equilibar pressure controllers diagram\" class=\"wp-image-39628 alignnone size-large\" srcset=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/Equilibar-PC-1024x289.webp 1024w, https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/Equilibar-PC-980x277.webp 980w, https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/Equilibar-PC-480x136.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/p>\n<figcaption>Pressure control loop using Alicat and Equilibar devices<\/figcaption>\n<\/figure>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]In this configuration, the Alicat PCD functions as an electronic pilot pressure controller within a <a href=\"https:\/\/www.equilibar.com\/back-pressure-regulators\/how-it-works\/\" target=\"_blank\">closed-loop system with the Equilibar BPR<\/a>, communicating through a PLC, PID controller, or computer interface. By actively controlling the pressure applied to the regulator\u2019s dome, the PCD defines the regulator\u2019s operating setpoint and allows pressure to be adjusted dynamically and repeatably, even in processes with large pressure differentials or rapidly changing conditions.\n\nIn applications where the pilot or backpressure gas is non-toxic, such as air or inert gases, this approach also allows pilot pressure to be safely vented to atmosphere, simplifying system design.\n\nBecause the PCD incorporates both inlet and exhaust control valves, it can actively increase or bleed pilot pressure as needed to maintain the commanded setpoint. Working in tandem with pressure relief valves and other system-level pressure protection devices, this controlled venting improves system response, minimizes overshoot, and helps stabilize pressure during setpoint changes or transient conditions. By actively managing pilot pressure rather than relying on passive elements alone, the PCD enables smoother, more predictable control of dome-loaded regulators in demanding applications.[\/et_pb_text][et_pb_heading title=&#8221;Pressure control in hazardous locations&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; custom_padding=&#8221;12px|||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_margin_tablet=&#8221;||||false|false&#8221; custom_margin_phone=&#8221;||||false|false&#8221; custom_margin_last_edited=&#8221;on|tablet&#8221; custom_padding=&#8221;||2rem|2rem|false|false&#8221; custom_padding_tablet=&#8221;|||0rem|false|false&#8221; custom_padding_phone=&#8221;||2rem|0rem|false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; custom_css_main_element=&#8221;float: right;&#8221; custom_css_free_form=&#8221;selector figure {||  display: table;||  margin-left: auto;||  margin-right: auto;||  text-align: center;||}||||selector figcaption {||  caption-side: bottom;||  display: table-caption;||}||||selector img {||  margin-bottom: 1rem;||}&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_tablet=&#8221;float: none;&#8221; custom_css_main_element_phone=&#8221;float: none;&#8221; custom_css_main_element_last_edited=&#8221;on|tablet&#8221; theme_builder_area=&#8221;post_content&#8221;]<figure><img decoding=\"async\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/11\/is-pro-group-prod.webp\" width=\"640\" height=\"320\" alt=\"Photo of Alicat intrinsically safe pressure instruments\" class=\"wp-image-46197 alignnone size-full\" srcset=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/11\/is-pro-group-prod.webp 640w, https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/11\/is-pro-group-prod-480x240.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 640px, 100vw\" \/><\/p>\n<figcaption>IS-Pro\u2122 Series pressure controller, PCD, and meters<\/figcaption>\n<\/figure>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]Processes involving flammable gases, hazardous vapors, or classified environments may restrict or prohibit atmospheric venting altogether. In these cases, pilot pressure control must be designed to comply with hazardous Class 1, Division 1, or Division 2 requirements, while still delivering the precision and responsiveness required by dome-loaded regulators.\n\n<a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-controller\/class-i-div-1-pressure-controllers\/\">Alicat\u2019s intrinsically safe series of electronic pressure controllers<\/a> are designed for use in classified environments where conventional enclosures or purge systems may be impractical. These controllers provide closed-loop electronic pilot pressure control while meeting applicable hazardous area requirements, enabling precise regulation without introducing ignition risks.\n\nIn one application, <a href=\"https:\/\/www.alicat.com\/articles\/pressure-vessel-regulation\/\">a North American gas company designing a pressure control system for pressurized vessels<\/a> used an IS-Pro\u2122 PCD to pilot a dome-loaded pressure regulator. By adjusting the pilot pressure proportionally, the ISPCD enabled high-resolution, closed-loop control of the DLPR, allowing vessel pressure to be regulated automatically in a Class I, Division 1 hazardous location. The system was configured to maintain vessel pressure between 0 and 100 PSIG (0 to ~6.9 bar), with inlet pressures ranging from 120 to 150 PSIG (8.3 to 10.3 bar). Pilot exhaust was vented to atmosphere, and the system operated across an ambient temperature range of 20 to 115 \u00b0F (&minus;6.7 to 46.1 \u00b0C).[\/et_pb_text][et_pb_heading title=&#8221;Closing thoughts&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; custom_padding=&#8221;12px|||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]Operations using dome-loaded pressure regulators benefit from electronic pilot control, allowing for precise and stable flow delivery and accurate setpoint control even as downstream conditions change. For these applications, <a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-controller\/pressure-controllers\/\">Alicat Scientific pressure controllers<\/a> provide not only exceptional accuracy and repeatability, but also enhanced data visibility and fast control response for tighter, more reliable performance.[\/et_pb_text][et_pb_heading title=&#8221;Key capabilities&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; custom_padding=&#8221;12px|||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<ul>\n\t<li>Compatible with a wide range of non-corrosive and corrosive fluids<\/li>\n\t<li>Available in absolute, gauge, or differential pressure<\/li>\n\t<li>&plusmn;&nbsp;0.125% of full scale accuracy<\/li>\n\t<li>&plusmn;&nbsp;0.08% of full scale repeatability<\/li>\n\t<li>0.01&nbsp;&ndash;&nbsp;100% measurement and control range (10,000:1 turndown)<\/li>\n<\/ul>[\/et_pb_text][et_pb_text module_class=&#8221;cta-link&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|700|||||||&#8221; custom_margin=&#8221;||2rem||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p><a href=\"https:\/\/www.alicat.com\/support\/choosing-a-pressure-controller\/\">Learn more about Alicat&#8217;s pressure control capabilities <span class=\"et-pb-icon link-right-arrow\">$<\/span><\/a><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"<p>Pilot pressure refers to the pneumatic control signal that defines a regulator\u2019s setpoint. In pressure control systems that use dome-loaded pressure regulators, this pilot signal is generated by a separate pilot device and directly determines how the regulator opens and closes to maintain the desired process pressure. In applications with extreme temperatures and pressures, severe [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":46359,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1400","content-type":"","_searchwp_excluded":"","footnotes":""},"categories":[164,165,114],"tags":[],"class_list":["post-46336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pc-series","category-pcd-series","category-pressure"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Pilot Pressure Control in Dome Loaded Pressure Regulators - Alicat Scientific<\/title>\n<meta name=\"description\" content=\"Paired with a dome-loaded pressure regulator, Alicat devices provide highly 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